The Grim Adventures of Billy & Mandy/Characters

Grim

 * Abusive Parents: Depending of the episode.
 * Affably Evil: Is remarkably polite when he isn't putting his scythe to work or getting bossed around by the title characters.
 * Anti-Hero: Type IV/Type V
 * Butt Monkey
 * Dark Is Not Evil: At the very least nowhere as evil as Mandy.
 * Deadpan Snarker
 * Dem Bones
 * The Grim Reaper: Obviously
 * Heroic Comedic Sociopath
 * The Kirk
 * Sinister Scythe: Which can do just about anything...except whack the weeds in Skarr's garden.
 * Too Dumb To Gamble: Maybe if he never wagered his own freedom, he would still be reaping souls.
 * Of course, he hadn't counted on Billy or Mandy cheating to win by getting Billy's ancient hamster to attack Grim during the game.

Billy

 * Anti-Hero: Type I
 * Chaotic Stupid/Stupid Good
 * Cloudcuckoolander
 * The Ditz: On a good day. On his bad days, he's simply Too Dumb to Live.
 * His IQ is -5, being outperformed in the test by a shovel and two candy bracelets (they got a positive 17).
 * Dumb Is Good
 * Expy: Of Stimpy.
 * Gasshole
 * He-Man Woman Hater: He insists that Mandy and other girls not be allowed on his baseball team...despite them soundly being better at it than he is.
 * Informed Judaism: The Christmas episode states he's Jewish, but it's never brought up again.
 * Keet
 * The McCoy
 * The Pollyanna
 * Talking to Himself: With his father, Harold.
 * Token Good Teammate
 * Took a Level In Dumbass: By the end of the show, Billy's become an Epic-Level dumbass.

Mandy

 * Beware the Quiet Ones
 * Big Bad: Of The Grim Adventures Of The Kids Next Door
 * Blondes Are Evil
 * Blue Eyes: At least according to Billy's eyes when he saw her in anime form.
 * Deadpan Snarker/Little Miss Snarker
 * Eldritch Abomination: Or at least a reasonable facsimile thereof.
 * Humanoid Abomination
 * Enfant Terrible
 * Expy: Of Courtney Crumrin.
 * Has a few elements of Ren as well, mostly in her role to counter Billy's Stimpy role.
 * Guile Anti-Hero: Type V
 * Hates Being Touched
 * Heroic Comedic Sociopath
 * Iron Lady/Lady of War: Thoroughly subverting Real Women Never Wear Dresses, Mandy, a staunch feminist, wears pink while discussing Faustian bargains over tea. Her ultimate goal in life is "[....]to do something important!"
 * Jerkass: Beyond a shadow of a doubt. Her beast transformation in "Sickly Sweet" even makes her sound like a literal ass (the animal).
 * Jerk With a Heart of Gold: She will occasionally meditate on the possibility that she actually cares about Grim and Billy...but ultimately dismiss the errant thought.
 * Karma Houdini: Rule of Funny usually dictates that she gets off scot-free. But there are a few occasions where she's outwitted.
 * Madden Into Misanthropy: It's implied that three things helped complete Mandy's metamorphosis into the cynical tyrant we all know and love: The realization that her beloved unicorn toys were being churned out daily by a factory, Mindy's inane, meaningless prattle, and having to deal with Billy every single day of her life.
 * The Noseless
 * One-Winged Angel: Her future self.
 * Perpetual Frowner: Because if she smiles....
 * The Spock/The Stoic
 * Villain Protagonist

Irwin

 * Black and Nerdy
 * Black Best Friend: To Billy.
 * The Chew Toy: He is pretty much the Kenny variant of this show.
 * Cross-Dressing Voices
 * Dogged Nice Guy: To Mandy.
 * Half-Human Hybrid: 1/2 Mummy, 1/4 Vampire, and 22/7 nerd.
 * Hero of Another Story: He is the main character of Underfist
 * Luke, I Am Your Father: Grandfather, to be precise.
 * Stalker With a Crush: To Mandy.
 * Took a Level In Badass: In "Underfist".
 * Verbal Tic: Yo

Fred Fredburger

 * Catch Phrase: "Yes!"
 * "Fred Fredburger, Fred Fredburger, Fred Fredburger, Fred Fredburger, Fred Fredburger, Fred Fredburger, Fred Fredburger..."
 * Cloudcuckoolander: Is primarily fond of nachos and spelling his own name "real good".
 * The Ditz: Even Billy is smarter than him and that REALLY says something.
 * From Nobody to Nightmare:.
 * Beware the Silly Ones
 * Keet
 * The Pollyanna
 * Potty Emergency: "I HAVE! TO MAKE! POO-POO!"
 * Trademark Favorite Food: Nachos and frozen yogurt, yes!
 * Verbal Tic: "Yes!"

Eris

 * Art Evolution: At least twice.
 * Artifact of Doom: The Apple of Discord.
 * Bare Your Midriff
 * Blondes Are Evil
 * For the Evulz: She's the Goddess of Chaos, which pretty much means it's her job to screw with the lives of mortals for fun.
 * Impossible Hourglass Figure
 * Jerkass Gods
 * No Celebrities Were Harmed: Her appearance and personality are based on Madonna.
 * Trickster
 * Valley Girl -> Fake Brit
 * Woman in White

Hoss Delgado

 * Badass
 * Dating Catwoman: His relationship with Eris.
 * Eyepatch of Power
 * Expy: From Snake Plissken and Ash at the same time!
 * The Hunter
 * Swiss Army Appendage: His cyborg hand.

Boogie

 * Big Bad: Of the first movie (interviews with Maxwell stated that Wrath of Khan was what inspired him to use him since he appeared in only one episode). He was also indirectly responsible for the events in the second one.
 * Humiliation Conga:
 * Jaded Washout: He tends to boast he used to be way scarier than Grim in their highschool years, but nowadays he is just a second-rate monster that can't even scare one single child (except Irwin).
 * Jerkass
 * Lean and Mean
 * Pirate: His motif in the first movie.
 * The Rival: To Grim.
 * Smug Snake
 * Villainous Breakdown: After the

General Skarr

 * Anti-Hero: In "Underfist". (Type V in fact)
 * Ascended Extra: The only "Evil Con Carne" character to get elevated to recurring status in "Billy and Mandy".
 * Canon Immigrant
 * Bald of Evil
 * Butt Monkey
 * Meaningful Name
 * The Neidermeyer: Was like this when he worked for Hector Con Carne.
 * Real Men Wear Pink: Is often seen gardening his front yard happily.
 * Scars Are Forever

Mindy

 * Alpha Bitch
 * Asshole Victim
 * Heel Face Turn: At the end of "Underfist".
 * Popular Is Dumb
 * The Rival: For Mandy, at least.

Sperg

 * Asshole Victim
 * Berserk Button: Don't talk about Sperg's Mom, even if you're referring to her as a respected member of the community.
 * Even Bad Men Love Their Mamas
 * Hot Mom: Has one
 * Jerkass: To most kids, but primarily to Billy and Pud'n.

Nergal

 * Anti-Villain
 * Beneath the Earth: Lives in the Earth's core.
 * Clingy Jealous Husband: "Son, it's not about you liking a girl, or a girl liking you. What's important is that she can never get away from you."
 * Combat Tentacles
 * Eldritch Abomination: He's a black creature from the center of the earth with electric tentacles (some of which have mouths), removable organs and the ability to turn people into members of his kind.
 * Humanoid Abomination
 * I Just Want to Be Loved/I Just Want to Have Friends: Played for laughs.
 * Interspecies Romance: With Billy's Aunt Sis.
 * Shock and Awe: Can electrocute people with his tentacles.
 * Yandere: Like father, like son.

Nergal Junior

 * Beneath the Earth
 * Combat Tentacles
 * Eldritch Abomination: Even more so than his father; he can shapeshift, walk through walls, spawn bat-like imps from his body and freeze people in supernatural stasis.
 * Glamour Failure: No matter what form he uses, he keeps his glasses, yellow eyes, sharp yellow teeth, and green tongue.
 * Half-Human Hybrid
 * I Just Want to Be Loved/I Just Want to Have Friends: Unlike his dad, not played for laughs... at first.
 * Loners Are Freaks: "Freak" is pretty much his nickname.
 * One-Winged Angel: His true form, which is so grotesque and deformed that it's rarely, if ever, seen onscreen.
 * Shapeshifter Default Form: The form of the first kid he tried to befriend (and subsequently did away with when he was rejected).
 * Cheshire Cat Grin: And how!
 * Voluntary Shapeshifting
 * Yandere: Initially portrayed as violently attacking anyone who mistreated him, but becomes somewhat more passive in later episodes.

Jack O'Lantern

 * Anti-Villain: The closest to one this show has.
 * Disproportionate Retribution: The members of his own town saw to it he was executed just because he didn't know when to stop pranking them. Pretty dark, given the silliness of the show in general.
 * Evil Laugh
 * Large Ham: He's voiced by Wayne Knight. Of course he's this.
 * Off With His Head
 * One-Scene Wonder
 * The Prankster: Of the evil variety.
 * Who Wants to Live Forever?: "Three hundred and sixty-four days a year, I can't even go the the Ding-Dong Grocery Store to buy pudding. And do you know why?"

Dracula

 * Expy: Of Blacula, the joke being he bears his name despite not looking at all what most media make of him. For extra Hilarious in Hindsight, in the Blacula movie Dracula is the one turns Blacula.
 * Grumpy Old Man
 * Jerkass
 * Jerk With a Heart of Gold: On occasion, such as sucking poison out of Grim or giving Irwin advice on accepting his monster heritage.
 * Jerk With a Heart of Jerk
 * No Celebrities Were Harmed: Redd Foxx
 * Screw Politeness, I'm a Senior!
 * Third Person Person