Adventure Time/Tropes I to R

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"Jake: "I taste awesome.""
 * I Cannot Self-Terminate/Mercy Kill:
 * In "Trouble in Lumpy Space", there's a conversation where Finn thinks Jake (in the throes of the Lumps) is about to request this of Finn, should he go completely Lumpy. It's never actually stated, and it turns out that Jake just wanted Finn to still be friends with a Lumpy Jake. "What did you think I was saying?"
 * Parodied in "Holly Jolly Secrets", where Beemo can't press the snooze button for his alarm function himself. It's against his programming.
 * I Don't Like the Sound of That Place: The Badlands, the Scary Dark Forest, the Desert of Doom, the Sea of Sure Death...
 * I Just Want to Be Beautiful: The Tree Witch. She's still evil, though.
 * I Just Want to Be Loved: Snorlock.
 * I Just Want to Have Friends: Marceline. Though she's gotten better.
 * I Taste Delicious: Almost said word-for-word when Jake eats a crayon drawing of himself in "The Jiggler":
 * I Taste Delicious: Almost said word-for-word when Jake eats a crayon drawing of himself in "The Jiggler":

"Finn: "Everybody wants to eat me up. Probably because I'm so sweet.""
 * Also in "Dungeon":

"Royal Tart Toter: "This cosmic dance of bursting decadence and withheld permissions twists all our arms collectively. But, if sweetness can win, and it can, then I'll still be here tomorrow to high-five you yesterday my friend. Peace.""
 * Finn's reaction to soy-people.
 * I Will Protect Her: Finn, towards Princess Bubblegum. And he has a Bodyguard Crush on her, too.
 * Ice Cream Koan: The Royal Tart Toter's speech at the Royal Meeting. Justified, as he is very senile.

"Jake: I never ate your donuts. Witch: Well, you're eating one right now! Jake: (mouth stuffed and holding a donut) No, I'm not..."
 * Ice Palace: The Ice King's lair.
 * An Ice Person: The Ice King.
 * Ice World: The Ice Kingdom, of course.
 * If I Had a Nickel: After he, Jake tells if he had a penny for every time someone has been driven mad with magic power... he'd be Abraham Lincoln.
 * I'll Kill You!: Used in various episodes.
 * I'll Tell You When I've Had Enough!: Happens to Clarence after
 * I'm a Humanitarian: try to eat Finn, and are later seen enjoying a soy-based human substitute. Which they share with Finn and Jake, who both find it delicious.
 * Implacable Man: The eponymous character in Hitman.
 * Implausible Deniability: Happens with Jake and the Witch in "The Witch's Garden", but, to be fair, Jake didn't know that he did the crime for a moment; his subconscious was hungry, apparently.

"Jake: Whoa, dude. Why are you naked? Finn: WHA!! PEEEEENNYYYYYYY!!!"
 * Impossible Thief: In "City of Thieves", Penny steals the clothes off of Finn's back without him even noticing.

"Finn: Now that's what I call a close shave. Jake: (Shakes his head while chuckling through Face Palm)"
 * Impossibly Delicious Food: The tarts. So much that they require a special transport chamber to carry them through, or "tart burglars" will try to steal them.
 * Improbable Weapon User: Finn, theoretically. "In a pinch, [...] [Finn] will use whatever is lying around."
 * In Joke: Several to character designer Natasha Allegri's cat Pancake, both visual and spoken.
 * Incredibly Lame Pun: The ending of "Loyalty to the King", after Finn reveals the Nice King to be the Ice King by gluing his shaved beard back on.

"Jake: Hey, what kinda coffee do you want? Finn: Hazelnut! Hazelnut! ...What if your name was Zelnut? And then I would be like, "Hey, Zelnut!" Jake: That's terrible... Finn: Hey, Zelnut! Jake: Noooooo! STOP!"
 * From "Beautopia":

"(from far away) Urgh, URGH! GET IT OFF ME! Cake: FIONNA?!"
 * Inherently Funny Words: Every frackin' episode.
 * Ink Suit Actor: Ricardio may well be the creepiest example ever. Basically, take George Takei's face, and paste it, in frightening detail, on an animated heart.
 * Prince Gumball looks surprisingly like NPH.
 * Lemongrab, obviously, sounds like every other character Justin Roiland has ever played- just a bit more nasally.
 * Innocent Fanservice Girl: Peanut Princess.
 * Innocent Innuendo: In "Fionna and Cake" shortly after Cake sends Fionna off alone with Prince Gumball to his room, she begins hearing strange noises that sound suspiciously like rape, but is actually.

"Finn: And like you always say, "Work and fun don't mix..." Jake: "...Unless you're a clown." I do say that a lot."
 * Innocuously Important Episode:
 * Inside A Talking Video Game System: Finn and Jake are sucked into Beemo's video game Guardians of Sunshine in the episode... "Guardians of Sunshine".
 * Instant Awesome, Just Add Ninja: Be prepared to subtract diamonds.
 * The entire episode of "The Chamber of Frozen Blades".
 * Invisible Wall: Beemo's video game Guardians of Sunshine has this feature; it represents the edge of the screen.
 * Invisible Monsters: Forget that; Finn and Jake go through an entire invisible obstacle course in "Rainy Day Daydream" which only Jake could see because it was in his imagination. "A bowl of baby elephants, chainsaws, and doo-doo's flying towards us! JUMP, DUDE!"
 * Irony: The fact that a post-apocalyptic world could be so bright, colorful, and happy (most of the time). Pen has pointed this out numerous times.
 * Irrevocable Order: The basic plot of
 * Irritation Is the Sincerest Form of Flattery: Played with in "In Your Footsteps", in which a bear starts immitating Finn. Finn doesn't have a problem with it until he believes the bear is trying to outright impersonate him. It turns out.
 * It Got Worse: "From Bad to Worse". The Candy Kingdom gets stricken with a zombie epidemic. Okay, nothing that hasn't happened before... except this time, Princess Bubblegum (AKA the only one who knows how to make the decorpsinator serum) gets zombified as well.
 * And then Finn's, Jake's, Lady Rainicorn's, and Lumpy Space Princess's attempts to make the serum cause the zombies to grow wings, become incredibly strong, and get awesome lips.
 * It Was Here, I Swear: Repeatedly subverted in "In Your Footsteps". Each time the bear does something strange, someone acts like this trope is in effect, only for it to turn out everyone already believes them.
 * It's All My Fault: Finn's exact words when his plan to carry the tarts through the Desert of Doom fails.
 * It's Like I Always Say...: A textbook example, since Jake has never actually said this in the show.
 * It's Like I Always Say...: A textbook example, since Jake has never actually said this in the show.

"Princess Bubblegum: He wanted our sugar, but I didn't give him any... if you know what I mean. (clicks teeth twice)"
 * Jade-Colored Glasses: After years of fighting evil, Billy found it completely pointless.
 * Jerkass: The Magic Man (and self proclaimed, to boot!)
 * Donny, at the beginning of his episode of the same name.
 * Xergiok.
 * Marceline's ghost friends, Wendy, Booboo, and Georgy. They didn't care whether Finn and Jake died and actually intentionally attempted to suck out their guts as a joke.
 * Sir Slicer.
 * Jerk with a Heart of Gold: Donny the Grass Ogre and Marceline.
 * While to a lesser extent, Jake and the Ice King work this trope. Jake embodied this trope in "Party Animal" and City of Thieves" when he, despite good intentions, did a lot of harm. The Ice King is ultimately a lonely man looking for love who is Not Evil, Just Misunderstood and . His actions are extreme but his goals don't involve anything completely evil.
 * Journey to the Center of the Mind: "Memory of a Memory".
 * Jump Scare: Sleepy Sam's scream in "Guardians of Sunshine."
 * Jungle Princess: Jungle Princess.
 * Just Eat Gilligan: Averted in "The Limit". Jake actually suggests stretching over the maze to skip the obstacles, but Finn points out the sign that says "NO CHEATING OR YOU DIE".
 * Karma Houdini: LSP could be considered one in "Trouble in Lumpy Space"; she kept making things harder for Finn to help Jake by being a Jerkass and when Finn calls her out she says she was only trying to help and makes him feel bad.
 * The three Jerkass ghosts from "Heat Signature" who spend the whole episode beating up and humiliating F & J, and don't recieve any sort of punishment for their actions.
 * Karmic Transformation: When Finn becomes a thief. The irony is that he spent the entire episode chastizing and punishing thieves.
 * Kawaisa: The cute little creatures from "Conquest of Cuteness" even if they don't think of themselves as such at first.
 * Killer Rabbit: The dimple plant.
 * Kissing Warm Up: Referenced in the episode "The Enchiridion." Finn opens the eponymous book to examine it and finds a page titled "Chapter 5: How to Kiss Princesses." Pausing the scene quickly reveals that the author recommends practicing on a Lip Monster beforehand.
 * Kiss of Death: Subverted. A kiss from Death restores your memories.
 * Knight of Cerebus: The Lich.
 * Lady of War: Warrior Princess.
 * If You Know What I Mean: Princess Bubblegum gives one in "No One Can Hear You":
 * If You Know What I Mean: Princess Bubblegum gives one in "No One Can Hear You":

""WE GOTTA WAHN DA BEEEEARS!!" "You BEARS gotta get outta here! Or you're all gonna be MELTED BAH LAVAH!" "IS PB OKAY?!?!?!?!""
 * Lampshade Hanging: As offbeat as the show is, they manage to do it without it being cynical.
 * Large Ham: The Ice King certainly qualifies.
 * Also Finn:

""This castle is in UNACCEPTAAABBBBLLLLLEEEEE CONDITIIIIOOOOOOONNNNNN! UNACCEPTAAAAAAABBBBLLLLLEEEEEEE!""
 * The Earl of Lemongrab.

"Jake: Ugh, I was reading the same paragraph over and over for like 11 minutes."
 * Last of His Kind: Word of God has it that Finn thinks he's the last human, although it's uncertain whether he truly is. There are certainly plenty of humanoids, though.
 * Lady Rainicorn's parents thought humans were extinct before meeting him. They might have the right idea, but it's still ambiguous, since they live in the Crystal Dimension most of the time. On the other hand, since, they might be in a position to know about this.
 * The episode with  leaves this ambiguous.
 * Late Arrival Spoiler: The preview for "Too Young"
 * Lava Pit: Beemo's video game Guardians of Sunshine has one.
 * Leaning on the Fourth Wall: "I bet I'll get that crystal eye and be back within 11 minutes!"
 * And in "Paper Pete":
 * Leaning on the Fourth Wall: "I bet I'll get that crystal eye and be back within 11 minutes!"
 * And in "Paper Pete":

"Jake: Uncle Jake's gotta find you a new love interest."
 * From "Incendium":

"Billy: It's as if your words are filling a hole in my very being... Wanna watch? (shows hole in his stomach filling up with body mass)"
 * Left the Background Music On: How the "Guardian Angel" meets her end, while playing the xylophone.
 * Leg Cling: The opening of the Title Sequence.
 * Leitmotif: The angry red squirrel from "The Duke" has his own background music that plays whenever he shows up.
 * Lethal Chef: NEPTR can make poison pies.
 * Let's Meet the Meat:
 * Naturally, the candy people. You're only supposed to eat the nonliving candy, but still.
 * Meat Man, the man who supplies Finn and Jake with meat.
 * Level Ate: At least a large portion of the Candy Kingdom is made of... well... candy. The sidewalks are made of peanut brittle and the foliages are made of cotton candy, for example.
 * Light Feminine and Dark Feminine: Marceline is the Dark Feminine, while Bubblegum is the Light Feminine.
 * Light Is Not Good:
 * Lighter and Softer: The Thanksgiving special "Thank You" takes a radical turn from the rest of the series, being that there is little action, little spoken dialogue and a solid Aesop.
 * Lightmare Fuel
 * Lightning Can Do Anything: Lightning brings N.E.P.T.R. to life in "What Is Life?"
 * Like-like Confession:
 * Literal Metaphor: From "His Hero":

"Ice King: Look, a supermodel! (Scorcher doesn't move) Look, a Hover Board! (Still doesn't move) Look, the APOCALYPSE! (No dice) (Beat) Someone got hit in the boing-loings. (Beat) Hit in the boing-loings. (Beat) Boing-loings. Boing-loings. Somebody got hit in them. (Scorcher finally looks away and gets frozen)"
 * Logical Weakness: It is revealed in "The Limit" that Jake cannot stretch too much or his internal organs will be easily damaged from being too thin.
 * Water for Flame Princess.
 * Look Behind You!: Zig Zagged with Ice King and Scorcher in "Hitman".

""Dude, I think I have a crush!""
 * Lotus Eater Machine/Daydream Surprise: In "Power Animal",
 * Love At First Punch: Finn's reaction to meeting.

""You look so cute sitting in your boat, I wanna suck out your eyeballs and rip out your throat. I wanna suck out your eyeballs... and rip out your throat...""
 * Love Makes You Dumb: So far, Finn's love for the abovementioned  really seems to mess up his sense of judgement,  though he agonizes over this.
 * Luminescent Blush: We dare you to count how many times Finn had this in "The Real You", and for that matter, "Blood Under the Skin".
 * Lyrical Dissonance: Marceline's song about a fisherman.

""Lada-da-da-da, I'm going to bury you in the ground. Lada-da-da-da, I'm going to bury you with my sound. I'm gonna drink the red from your pretty pink face...""
 * The song she sings in "What Was Missing" also definitely counts:

"Finn: (shrivels face) Whatever."
 * MacGuffin: The crystal eye in "Dungeon".
 * MacGuffin Title: "The Enchiridion!"
 * Magic Antidote: In "Trouble in Lumpy Space", antidote for lumpiness isn't in the orb; the orb is the antidote.
 * Magic Wand: Xergiok has one. According to Finn they are for wiiimps!
 * Maintain the Lie: The plot for "Her Parents". Jake has to pretend to be a rainicorn to impress Lady's parents, because rainicorns and dogs are supposed to be enemies due to a war.
 * Major Injury Underreaction: Finn's reaction to getting both his legs broken in two places each "No One Can Hear You":

""What.""
 * Subverted in that he clearly was in pain, but was just trying to hide it.
 * Make-Out Point: There's one in Lumpy Space, and it looks suspiciously like a tongue.
 * Makes Just as Much Sense in Context: "PIZZA!!!!!!"
 * Mama Bear: Cake, when she mistakenly thinks
 * Marionette Motion: Marceline's dad.
 * Mary Sue: In-Universe.
 * Meaningful Name:
 * Ricardio the living heart.
 * Sage Bufo lives in a toad.
 * Medium Blending: Done in "Guardians of Sunshine" when CGI is used along with 2D animation.
 * Meganekko: Doctor Princess.
 * Princess Bubblegum in "Goliad".
 * Memetic Hand Gesture: The whole "Adventure Time!" fist pound between Finn and Jake.
 * Memory Gambit:
 * Mind Control Eyes: Old Lady Princess gets these by the Ice King.
 * Mind Screw: "Now I have a memory of your memory in my memory."
 * Describes the show in general, actually. The most common response after seeing one of the "weirder" episodes for the first time is:

"Bucket Knight: Just add water and, EXPONENTIAL GROWTH!"
 * The title card for "Return to the Nightosphere".
 * Mind Screwdriver:
 * Mini-Mecha: In "Hot to the Touch",
 * Miracle-Gro Monster: The Bucket Knight.

"Finn: Come on, Jake, I know this isn't a mirror! You're doing it WRONG, even!"
 * Mirror Routine: Parodied in "Marceline's Closet" with Finn and Jake.

"Finn: THIS... IS... AWESOME! Jake: Yeah dude! Force that enthusiasm!"
 * Moe Anthropomorphism: The village of house people.
 * Moment Killer:
 * Finn, for even though it was awesome.
 * Also, the Royal Tart Toter in "The Other Tarts", interrupting Finn and Princess Bubblegum's reconciliation hug.
 * Monster Clown: The clown nurses from "Another Way", who have some sort of foot fetish which they perform on Finn. It doesn't help that he faints and starts having clown nightmares.
 * Mood Whiplash: "Tree Trunks".
 * As mentioned, Finn.
 * Happens a little in "Mortal Folly" and "Mortal Recoil": the Lich, Knight of Cerebus that he is, did have a lot of scenes, but there was also a lot of scenes with the Ice King acting goofy and not knowing what's going on, jarring with the scenes of the relatively serious villain.
 * A good example is in "Morituri Te Salutamus", in which the scenes repeatedly change between Finn violently defeating the ghost-gladiators and Jake happily singing about raising morale. On top of this, the Fight King, like the Lich, is a completely serious villain.
 * "What Was Missing" starting as a super-silly "write a song" episode. But once Bubblegum calls Marceline's lyrics too distasteful, it becomes a completely serious song where Marceline confesses her feelings about Bubblegum and their past, over a droning electric bass. "I shouldn't have to be the one who makes up with you, so why do I want to?" She backs off once she realizes how confessional she's getting, but DAMN.
 * Same episode, with Finn's song, which starts out with Finn admitting that he's incredibly self-conscious of the fact that he's younger than all his friends and occasionally questions his friendship with them.
 * "Holly Jolly Secrets" has this in spades at the end. Silly Ice King antics for the entire episode and then suddenly
 * In "Ghost Princess", there is a scene that shows Clarence and Ghost Princess on a date at a Spirit Waves show. When Clarence tells Ghost Princess how beautiful she is, the scene cuts to Finn wildly desecrating graves.
 * "Just the Way You Are" at the very end. After being followed and copied by a bear for the entirety of the episode, Finn proceeds to tell it off at Jake's behest, causing it to run off into the woods and cry. Luckily, Finn chases after it, and after giving it a heartwarming Be Yourself speech, he hands the bear then Enchiridion, and it merrily goes off on its way.
 * Moral Dissonance: Season 4 is the main purveyor of this trope:
 * In "Dream of Love", the main characters get really brutal towards the relationship of Tree Trunks and Pig and how they don't like it. The one person that has no excuse is Jake who, by Word of God, is boyfriend to Rainicorn and loves romance movies. Yet he doesn't want these two to be together for some reason.
 * The worst part was there was no real reason their love wouldn't work out. No one's life was in danger, there was no treacherous plot. It was just two people in love and the main cast being dicks.
 * In the episode "In Your Footsteps", Princess Bubblegum seems to be very happy with the bear posing as Finn giving her the "Heimlich maneuver". She even knew that it was a bear. She should have backhanded him to next Tuesday. Every episode prior to this shows PB shrugging off Finn's romantic advances, saying the age difference is the main problem. Then a bear grabs her from behind and she's okay with that? Unless... she really wants a physical relationship.
 * Mountain of Food: Downplayed with Everything Burrito, which contains pretty much every common food you can imagine. Yum. Did we mention it also contains pans and cups?
 * Played literally with the Rock Candy Mountains in the Candy Kingdom.
 * Multiple Head Case: Princess Princess Princess has at least five heads.
 * Mundane Made Awesome: Battle cubes.
 * Dustomancy! Lampshaded by Jake at one point.

"Finn: Okay. So you guys should wish to get your buddies back right? Hot Dog Knight: I wish for a box! (box appears) Sweeeet!"
 * The Whistling Choir Death Match Championship.
 * Finn and Jake's fourth and fifth high-five in "Five Short Graybles".
 * Mundane Utility: Word of God says that Jake often uses his stretching powers for everyday situations due to his lazy nature.
 * Mundane Wish: Oh, Hot Dog Knights, you sillies.

"Ice King: What Have I Done? I killed my only friend!! Jake: But what about m--? Ice King: WHY?! WHYYYYYYYYYYY?!!!"
 * My Friends and Zoidberg:

"Finn: NOOOO! What Have I Done?! What Have I Become?!
 * My God, What Have I Done?: Happens to Finn when he realizes that he stole something.

Penny: You've become a thief, stupid! Hahahahahaaa!!"

"Princess Bubblegum: If you fail... he'll kill everyone."
 * Mysterious Parent: We don't know who Finn's real parents were, all we know is that  were his adopted ones. We also don't know PB's either.
 * Naked People Are Funny: Naked Wizard.
 * Name McAdjective: Wormy McSquirmy.
 * Nerd Glasses: The Glasses of Nerdicon. Avert Purely Aesthetic Glasses because they actually do make the wearer smart.
 * Nested Story Reveal: In.
 * Never Say "Die": Averted six ways to Sunday. Pretty much a Once an Episode thing.

"Death: You can't kick me because your brain is stupid!
 * Never Trust a Trailer: The previews for "The Other Tarts" as well as the title card imply that the Royal Tart Toter would have an important role. He didn't. He showed up only at the end of the episode for the sole purpose of being creepy and delivering an Ice Cream Koan.
 * Happened even worse with "Holly Jolly Secrets". The trailer implied several characters would show up throughout the episode. In reality, only Finn, Jake, and the Ice King had prominent roles.
 * Nice Hat: Quite common in the series. Finn's hood, the Ice King's crown, and Party Pat's fedora are pretty good examples.
 * To that, let's add Marceline's sunhat in "What Was Missing".
 * Nice Job Breaking It, Hero: When Finn releases the Lord of Evil from the Nightosphere.
 * When Finn and Jake are trying to teach Goliad how to be a good ruler,
 * Ninja Pirate Zombie Robot:
 * Lady Rainicorn, who's half-unicorn, half-rainbow.
 * The Gauntlet Dock. It's a dock AND a gauntlet!
 * Princess Bubblegum is a half-bubblegum scientist princess.
 * The Snake-armed Ruby Brainbeast from "Tree Trunks".
 * The Ancient Psychic Tandem War Elephant from "The Limit"
 * No Indoor Voice: Lemongrab. Sweet mercy, Lemongrab.
 * No Infantile Amnesia: Finn remembers an incident that happened during infancy where he crapped boom-boomed on a leaf and fell backwards into it and no one would help him.
 * No One Could Survive That: In "The Real You",
 * No, You:
 * No, You:

Finn: Your brain is stupid!!"

"Clarence: Hold up! These guys are with me. Ghost: A'ight, Clarence, but only because of that one time when I did that thing by accident, and you were cool about it."
 * Noir Episode: There is a season four episode called "B-Mo Noire" that will possibly feature this.
 * Non-Indicative Name: There's a character named Gary the Mermaid Queen in "Witch's Garden". She is an animated human skeleton and acts rather bird-like.
 * Doctor Princess is not really a princess. "'Princess' is just a surname."
 * There are many kingdoms in the Land of Ooo, but many of them are ruled by princesses, which would actually make them principalities.
 * "Holly Jolly Secrets." The only secret revealed in the episode isn't jolly at all.
 * Noodle Incident:
 * At the start of "The Jiggler", Finn and Jake have just finished an adventure where they saved a "family" composed of a pair of watermelons, sausages, marshmallows and such (not even anthropomorphic, either), which apparently involved rescuing them from an evil citadel, a lot of fire, and Finn swallowing a little computer at some point.
 * In "Prisoners of Love", Jake tries to play a flute that immediately breaks. Jake mentions that he broke it when they "unlocked that Sad Ogre's heart", an adventure we have not seen and are not told any further details about.
 * "Morituri Te Salutamus" begins with the last seconds of an incident that somehow involves a giant burger monster, a pile of cute little hedgehog-like critters, and Jake not sticking to the plan.
 * In "Holly Jolly Secrets,"
 * In "Ghost Princess", some ne'er-do-well ghosts were about to fight Finn and Jake, until Clarence showed up; at which point, this exchange takes place:

"Jake: A guy drops one piece of ham in the snow and he never hears the end of it!!"
 * In Hot To Touch, Finn calls Fire Princess innocent, like the steam on a puppy's nose looking for ham in the snow. Jake responds:

"Cake: RAAAH!! (attacks Gumball) DON'T YOU TOUCH HER!!"
 * Not Drawn to Scale: Finn looks noticeably taller in "The Creeps". He's not any older though.
 * Word of God says he was wearing lifts.
 * Not Me This Time: One episode has Princess Bubblegum order Finn and Jake to capture the Ice King, even though he objects, claiming to have done "no recent crime." Played With because he did do something, but accidentally.
 * In "Princess Monster Wife" when Finn and Jake confront the Ice King over the princesses' stolen body parts he says he's not the culprit and he's just as concerned as they are, as the thief might come after his own princess. It turns out this princess is made from the body parts of different princess, he was the culprit and he thought they were talking about another body part thief.
 * Not Quite Dead:
 * We see.
 * Not What It Looks Like: Happens in "Fionna and Cake" when Cake finds.

"Ice King: So, what did you think of the fanfiction I wrote about you guys? Finn: (beat) Uuuuuhhhh..."
 * Oculothorax: Gork.
 * Off-Model: Many fans complained that Jake was this at the beginning of "Crystals Have Power".
 * An Offer You Can't Refuse: In "To Cut a Woman's Hair", a tree witch threatens to kill Jake if Finn doesn't get her princess hair.
 * Official Couple: While Lady Rainicorn and Jake were just flirting cutely in the pilot, in the series, they're officially dating.
 * Offscreen Moment of Awesome: The epic battle between the Lich and Billy for the fate of the world. All we saw was the brief snippet in Billy's Song, which consisted of Billy kicking the Lich into his castle. Considering the Lich ultimately ended up in the Candy Kingdom being pummeled into a tree so hard he was sealed in amber (which we don't see either), it's clear the rest of the battle was likely extremely awesome.
 * Finn, Jake and the Ice King's ninja fight in "The Chamber of Frozen Blades".
 * Off with His Head: Finn does this a lot in "Morituri Te Salutamus" to the gladiator ghosts.
 * Oh, Cisco: To Beemo at the end of "Slow Love".
 * Oh Crap: Marceline in the Season Two Premier.
 * Finn gets one in "Mortal Folly" when
 * In "Mortal Recoil" Finn and Jake both make "Oh Crap" faces when
 * In "Incendium" Jake gets one when he realizes that Flame Princess is evil and dangerous.
 * Oh Crap There Are Fanfics of Us: In

"Finn: What the-- Jake! You never turn into a monster when I want you to! It's always, "Not now, Finn. I have a headache.""
 * Once an Episode: In every episode, there will be a snail that is waving to the audience. Or at least his shell.
 * One-Winged Angel:
 * Marceline, when she goes full bat.
 * He wasn't at full power yet.
 * OOC Is Serious Business: Finn crying.
 * Operation: Jealousy: Jake attempts one in "My Two Favorite People".
 * Finn also attempts one in "Go With Me".
 * Orange-Blue Contrast: The title card for "The Real You".
 * Basically, Finn and Jake.
 * Oscar Bait: The season three episode "Thank You" was deemed "Oscar-worthy" by Cartoon Network, so they put a preview of the episode in a movie theater so that it could qualify.
 * Our Demons Are Different: Their blood can be used to make swords.
 * Our Dragons Are Different: Very much so.
 * Our Ghosts Are Different: They have the ability to suck out your guts, through your brain.
 * Our Giants Are Bigger
 * Our Goblins Are Different: They're born from mud, apparently.
 * Our Gods Are Greater: There is a four-headed deity from Mars called Grob Gob Glob Grod.
 * Our Liches Are Different
 * Our Monsters Are Weird
 * Our Gnomes Are Weirder: Oh, yes. They actually make Finn pole-dance in one episode.
 * Our Vampires Are Different: They only drink blood because it's red; Marceline actually sucked the color out of a strawberry in her debut episode.
 * Our Werewolves Are Different: Finn mentions werewolves, but they have not yet been seen. But there are whywolves, werewolf like creatures born out of inquiry... and bloodlust. They eat house people, and are in turn eaten by the Cosmic Owl. Obnoxygen, a gas given off by incredibly rude people, is toxic to them.
 * Out Giving Birth Back in Two Minutes: Averted in "Web Weirdos".
 * Outlaw Town: "City of Thieves"
 * Candy City in the episode "The Apple Thief"
 * Out-of-Clothes Experience: The Ice King has one when he's knocked unconscious. Mercifully, his beard inexplicably becomes longer to cover him.
 * Overly Long Gag: We'll never run from the fun because we're bears bears bears bears bears bears bears bears bears bears bears bears beeeeeeeeeeeeeeeeeeeeeeeeaaaaaaaaaaarrrrrrrrrrrrrrrrrrrssssssssssssssssssssssssssssssssssssssss!
 * Overly Long Title: The upcoming video game is titled Adventure Time: Hey Ice King! Why’d you steal our garbage?!
 * Owl Be Damned: The Cosmic Owl at the end of the Croak Dream. This refers to the fact that many religions see the owl as an omen of death to come.
 * Paper-Thin Disguise: Finn, Jake, and Tree Trunks' disguises in "Apple Thief" (if they can even be called that). They just cover themselves in dirt, and the bartender that they met not 30 seconds ago doesn't even recognize them.
 * Parental Bonus:
 * Parental Bonus:

"Jake: This is gonna be as easy as... umm... mmm... Finn: Easy as childbirth! Jake: Yeah, okay."
 * From "The Monster":

"Finn: Look at that huge mirror! And it's painted baby blue! Boy style!"
 * Percussive Maintenance: Used on a gauntlet, only for it to then turn out to be a living thing that feels pain.
 * The Pig Pen: Penny is pretty dirty.
 * Pink Girl, Blue Boy: Finn and Princess Bubblegum. The "blue boy" part of the trope is Lampshaded by Finn in "The Silent King".

"Ice King: No one sucks the life from my penguins except ME! And maybe polar bears. Because that's just nature, Gunter."
 * Planet Eris
 * Planet of Hats: Every kingdom in Ooo seems to have a gimmick of which it is named after. For example, there's the Candy Kingdom, the Ice Kingdom, Lumpy Space, and many others.
 * Playing Sick: In the original storyboard for "Storytelling" Jake is not really sick. He only does says so in order to make Finn leave so that he could stay at home doing weird things while no one was looking.
 * Playing with Fire: The aptly-named Scorcher.
 * This also includes the aptly-named Flame Princess, who embodies this trope with a touch of evil.
 * Plot Relevant Age Down:
 * Poke the Poodle: The Giant Worm King hypnotised Finn and Jake just to make them hug him.
 * Polar Bears and Penguins:
 * Polar Bears and Penguins:

"Ice King: Your hat is stupid! Finn: MY HAT! IS! AWESOME!"
 * Poor Communication Kills: In "What Have You Done?" because Bubblegum doesn't adequately explain what the Ice King did and just says he "didn't do anything" Finn thinks he's going to be punished for no reason and sets him free.
 * The Power of Friendship:
 * The Power Of Liking Someone A Lot:
 * Powers for A Day: Finn and Jake get wizard powers in "Wizard", ranging from controlling shadows to generating mayonnaise. According to Word of God, they lose them at the end of the episode when their robes are destroyed. Here are some of the powers:
 * Casting a Shadow: Shadowcery.
 * Deflector Shields: Reflect.
 * Flight: Beauteous wings.
 * Having a Blast: Creating fireworks.
 * Natural Weapon: Tiger claws.
 * Whatevermancy: Dustomancy.
 * Wreathed in Flames: Blazing feet.
 * Powers That Be: The Cosmic Owl, whom the Ice King comes face to face with after falling unconscious.
 * Power Up Scream: "RRRRAAAAAWWWWWRRRR!!"
 * Princess Curls: Princess Bubblegum in her "glamour outfit"
 * Princesses Rule: Princess Bubblegum.
 * Pstandard Psychic Pstance: Frequently in "Rainy Day Daydream".
 * Psychic Block Defense: The crystal headbands used to block the Lich's mind control.
 * Psycho Strings: Happens in "Mortal Recoil" for Princess Bubblegum when Finn leaves the room.
 * Used in "Another Way" for the clown nurses.
 * Pun-Based Title: Averted with "What Was Missing", which was originally called "Door Jam". (The episode is about opening a jammed door using music.) The crew actually prefers not to use puns as titles.
 * Punch Clock Villain:
 * Literally with the Business Men. They even have a main mook with a different colored tie to tell who's the King Mook and who are regular Mooks.
 * The Crystal Men in "Crystals Have Power," who are somewhat awkward about the whole thing, say they're just following orders, and have to keep themselves from getting distracted and texting.
 * Scorcher seems to qualify as well, the moment his business is done, he just leaves without any further fighting.
 * Punctuated! For! Emphasis!:

"Jake: I. AM. NOT. A... BANANA!"
 * From "Death in Bloom":

"Gate guard: [Why] did you die? Finn and Jake: ...Because we're awesome!"
 * Punny Name: Ricardio, a living heart. (Specifically 's.)
 * Keyper from "The Enchiridion!"
 * Marshall Lee, the male counterpart of Marceline.
 * Puppy Love: Finn and.
 * As of Season 4, though the relationship is one-sided, Finn and.
 * Not entirely one-sided. But problematic.
 * Pure Awesomeness:

"(Scorcher appears behind Ice King) Ice King: Whoa, you are fast. (beat) Ice King: And quiet. (beat) Ice King: And very good at dramatic silence, I like it..."
 * The Quiet One: Scorcher, a hitman Ice King hires in "Hitman".

"Finn: If there's anything I've learned today, it's that I am awesome at talking to ladies. And lady, you are CRAZY UGLY! Having beautiful hair isn't gonna get you anywhere because you're ugly inside and out. So ugly, I want to throw up. No one will ever find you beautiful. EVEEERRR. And it has nothing to do with the old chrome-dome. (touches his heart) It has to do with what's in here."
 * Raised by Humans: At one point, Finn The Human tries to raise a baby Jiggler. His heart's in the right place, but he doesn't know how to take care of the Jiggler and nearly kills it. He ends up bringing the baby back to its mother.
 * Raised by Wolves: "Memories of Boom Boom Mountain" reveals
 * Rapid-Fire "No": Finn delivers one in "The Chamber of Frozen Blades".
 * Finn also does one in "Hot to the Touch" after
 * Rapunzel Hair: Princess Bubblegum, Marceline  have really long hair.
 * Reality Warper: Anything Jake imagines becomes real, for some reason. Finn eventually repeats the effect.
 * Real Life Writes the Plot: Since Finn's teenage voice actor is developing a deeper voice, the writers decided to age up Finn from 12 to 13. They have also slowly introduced more mature themes like romance.
 * Real Men ARE Pink: Princess Bubblegum's male counterpart, Prince Gumball.
 * "The Reason You Suck" Speech: A very blunt one given by Finn to the Tree Witch in "To Cut a Woman's Hair", with Jake continuously and angrily shouting, "DUUUDE!"

""Solvin' crimes and makin' up rhymes.""
 * Redheaded Hero: Younger Billy.
 * Reflective Eyes: Jake has this in the title card for "Gut Grinder".
 * Retcon: "Crystals Have Power".
 * Gob, Grod, and Glob are actual deities.
 * Retired Badass: Billy. How Badass was he? He killed an evil ocean... by PUNCHING IT! Still not sure? Princess Bubblegum says Billy didn't just imprison the Lich in amber, he did so by pummeling him into the tree.
 * Retractable Weapon: Fionna's crystal sword.
 * Reset Button: Princess Bubblegum  in "Too Young."
 * Rhymes on a Dime: Jake.

""No money for me? How about a poem for free!""
 * Also, the punishment for stealing boots is poots on newts.
 * Choose Goose:

"Finn: Kitties, zitties, witties mitties, knitties, fitties, hitties, jitties, pities, cities."
 * In "Ocean of Fear", Jake convinces Finn to take an oath to speak in rhyme. Finn actually does an admirable job of it for most of the episode.
 * From "Paper Pete"


 * Ridiculously Cute Critter: The Jiggler, and arguably, the candy villagers.
 * The Dimple Plant, for a short time, anyway.
 * The pigs
 * The Firewolf pup from "Thank You".
 * Right on Queue: The lines in the Nightosphere. Finn and Jake wait 13 days to see Hunson Abadeer, only to go to another line.
 * Ring of Power: The power rings, of course! Also, Ice King's mind-control engagement ring.
 * The Rival: Princess Bubblegum and Marceline are essentially rivals.
 * Robot Buddy: NEPTR.
 * Royals Who Actually Do Something: In one episode, Finn becomes king of a goblin city. He tries to be this, but the rules of the city force him to essentially be a figurehead.
 * Princess Bubblegum probably counts, as she actively worked to fix the plague the Ice King accidentally caused and betters her kingdom through her scientific research.
 * Royal We: Employed by the Flame King.
 * RPG Elements: Levels, cursed objects you can't take off etc. More DnD-style than video games, and tends to only be minor elements that are only important for the episode.
 * Rubber Hose Limbs: Every character has this, unless they're a skeleton.
 * Rube Goldberg Device: How Finn fulfills his vow to make everyone happy in "Memories of Boom Boom Mountain".
 * Finn and Princess Bubblegum use one to prank Lemongrab in "Too Young".
 * Ruins of the Modern Age
 * Rule 63: Character designer Natasha Allegri came up with the idea of what it would be like if Finn and Jake were girls, named Fionna and Cake. For some reason, Cake is a cat. Other bent characters include the Ice Queen, Prince Blowpop, Marshall Lee, and Lord Monochromicorn. And it all started off from her occasional visits to /co/'s Adventure Time drawthreads. Later canonized in the episode "Fionna and Cake."
 * Running on All Fours: Finn in "Go With Me".