Yandere/Western Animation

Gaston in Beauty and the Beast becomes a male version of this towards Belle.
- Forte in Beauty and the Beast: The Enchanted Christmas towards the Beast.
Lizzie from Codename: Kids Next Door is Nigel's clingy jealous girlfriend, who can go from sweet and cutesy into an Unstoppable Rage in seconds when things don't go her way. Oddly enough, she's the one who breaks up with Nigel.
Berry from Foster's Home for Imaginary Friends totally fits this trope, acting sweet and kind, but being homicidally jealous of anyone who she perceives as a threat to her relationship with Bloo, which is even more imaginary than she is.
The eponymous character of Pucca. She's smitten over Garu, but since he thinks Girls Have Cooties, he's not having any of it. Ever.
Panini on Chowder is obsessed with the title character, to the point where it's scary at times.

"I just wanted to pass laws to make you my property!"

Wendy, Stan's love interest/girlfriend in early seasons of South Park. She went so far as to have a substitute teacher (later revealed to be lesbian) arrested on false charges and locked inside a rocket launched directly at the sun, for the crime of having been the object of a brief crush from Stan.

Simple rule to follow: "Don't. Fuck. With. Wendy. Testaburger"

Azula from Avatar: The Last Airbender fits this when you think about. Her entire Villainous Breakdown is caused by Mai and Ty Lee turning on her for Zuko, who she is thereafter ready to kill on sight.
Sadira in Disney's Aladdin animated series is a "street rat" like Aladdin was, and falls for Aladdin the way he did for Jasmine, but, since he's in love with Jasmine he refuses her. Then she stumbles onto an ancient library of forgotten magic, and the end result is increasingly dangerous plots to get rid of Jasmine and take Aladdin for herself, including rewriting reality at one point and altering his mind. Eventually she gets over her crush and befriends the gang, but almost has a brief relapse when she believes they don't trust her.
- Jasmine, due to Criminal Amnesiac in "Forget Me Lots".
Family Guy.
- Quagmire marries one (Joan) in the episode "I Take Thee Quagmire" in Peter convinces him to get a divorce using champagne and Lois's breasts, and when he tries to broach the subject she threatens to cut herself with a kitchen knife and then cut him.

"I love you, Glen..." Slasher Smile*
"And I love you too, Crazy Woman I'm Having Second Thoughts About!"

Quagmire was also the victim of a far worse Yandere later named Sonya; she was a fan of sadio-masochism who took the "sadistic" part way too far, and he was far from her first victim. Seeing as everyone in Quahog seemed to regard Sonya as a "psycho" it doesn't say a lot for his intelligence.
Meg is Yandere for Brian in "Barely Legal". In fact, Meg in general.
Stewie has also shown to be quite the Yandere towards whoever he may express an attraction to or fall in love with, male or female.

During one episode of Teen Titans, Starfire shows a few Yandere tendencies when Kitten blackmails Robin into going to her high school prom with her. At one point, she crushes the front end of a car with a single punch. She stops once the forced date plotline is resolved.
In one Looney Tunes cartoon, Daffy must exorcise a possessed heiress, though there's open room for interpretation that she was actually one of these.
Captain Hero from Drawn Together.
"Cynthia", the Robot Girl from the Batman Beyond episode "Terry's Friend Dates a Robot".
In one rather disturbing Disney example, Daisy Duck becomes one in Donald's Dilemma.
The Fairly OddParents gives us Princess Mandie. "Nobody leaves me at the altar! NOBODY!"
- And there's "Just The Two Of Us", where Trixie goes batshit insane on Timmy.
One episode of The Oblongs had Helga Phugly become one towards Milo because she wants him to take care of her due to her parents being absent.
The Planet Express Ship from Futurama. She tries to kill herself and the rest of the crew after Bender breaks up with her.
- Not to mention Bender himself towards Fry, albeit platonically. When Fry discovers his old dog Seymour's corpse fossilized in a museum, Bender becomes increasingly jealous until, when Fry announces he's going to clone Seymour, Bender grabs the fossil and throws it into a live volcano (in a near-literal Kick the Dog), screaming that he's never, ever going to let himself be replaced as Fry's best friend if he can help it.
The Hunchback of Notre Dame gives us Frollo. Direct quote: "Destroy Esmeralda, and let her taste the fires of Hell! Or else let her be mine and mine alone..."
- The difference here is that he only wants to have sex with her, against her will. He doesn't actually love her.
On American Dad, Francine Smith has shown these tendencies towards her entire family, but most of the time it is directed toward her son Steve. The whole thing gets taken to an especially creepy length in the episode Iced Iced Babies.

Francine: You can stay right here. With mommy. Forever.

- When Hayley Smith gets dumped, she burns down forests.
- Stan gets this way when someone starts dating his mother.

Stan: Francine, I can explain. SHE'S MY MOMMY.

SpongeBob SquarePants: The episodes Valentine's Day and Nature Pants depict Patrick as having these tendencies towards Spongebob.
- "You're gonna look good on my mantle!"
The Simpsons: One-shot character Julia was one of these towards Homer in the episode "Homer Of Seville".
- And the Pierce Brosnan Ultrahouse on "Treehouse of Horror XII."
Cookie BaBoom, Mayor Tilton's ex-girlfriend on The Mask episode "Flight as a Feather." Uses a variant of the Stock Phrase, "If I can't have you, then no one can" (on the episode, it was, "If I can't have Mortimer, then no one can!" Standard. Is still bitter over being dumped by Mayor Tilton? Okay. Uses two strategically placed explosive belts strapped around her body to kill herself, the mayor, and everyone else around her because of the deep-seated resentment she has over being dumped. Bingo!
Puddin's rabbit from the wishing skull episode of The Grim Adventures of Billy & Mandy.
- Also Nergal Jr as, like Nergal, his dad, wants desperately to make friends but if people refuse to be his friends he freezes them and takes their form.
Mort in The Penguins of Madagascar. Especially the evident in the episode "Mort Unbound."
Heloise on Jimmy Two-Shoes. Among the things she's done when Jimmy hasn't noticed her is doing a Freaky Friday Flip on Beezy and Cerbee and fusing Jimmy and Beezy together. There's also "Best Bud Battle", where Heloise chains Jimmy up to keep him from leaving her and locks him in a tiny cage.
- Max the Weavil gets to be this toward Beezy fairly quickly...
Suzy Johnson, Jeremy's clingy, Creepy Child little sister from Phineas and Ferb.
Whitney Stane from Iron Man: Armored Adventures. Her feelings for Tony appear to be yandere, becoming violent if there is a possible threat to Tony's life, even going so far as to try to kill her own father as she believed he was trying to harm Tony.
Breach towards the titular Generator Rex...sort of. While she does have an unhealthy obsession with him (kidnapping him to make him her boytoy, and refusing to let him go even when her life was in danger because of him) it's never been confirmed that she likes him romantically. (If we take her literally, she just thought Rex would be a great action figure.) There's enough evidence for fans to run with, though.
- For a definite example, there's that Creepy Child minion of Breach's. She's never named, but she's absolutely obsessed with making Breach happy and tries to kill Rex when she realizes Breach likes Rex more.
Yo towards Chum Chum in Fanboy and Chum Chum. She's obsessed with taking him home, dressing him up in a sailor outfit, and putting him on her toy shelf. She even trapped him in a giant virtual pet case at one point. Also a Genki Girl.
The Bride of Gingy in Scared Shrekless. . . .
Mother Gothel from Tangled is this to Rapunzel, though it's not for Rapunzel herself but for her hair which keeps Gothel young and beautiful. Towards the end, she gags Rapunzel, puts chains on her and drags her to the basement so she won't escape.
The Penguins of Madagascar: In a semi-Ho Yay semi-Fetish-specific variation, Mort behaves like this towards King Julien's feet. It's never actually put into words why, but ...
In an episode of Disney's |Hercules cartoon, Hercules gets an idea when he learns about Pygmalion and tries to make his own dream girl out of clay. Unfortunately, being a hormonal teenager, all the personality he can think to give her is "in love with me". Aphrodite, who Hercules has called to assist in this endeavor, snarks on the poorly-thought-out idea, but brings her to life anyway. Naturally, after Hercules gets tired of her Clingy Jealous Girl tendencies, she shows off her Yandere tendencies. By the end of the episode, Aphrodite gives her a real personality... one that just doesn't care much for Hercules at all.
Somewhat Elena Validus turned into this to Ben in Ben 10: Ultimate Alien episode "Revenge of the Swarm".
While not murderous (probably), Sierra from Total Drama World Tour shows many signs of this towards her crush Cody.
The Problem Solverz: Katrina Rad is obsessed with Roba and stalks him in "Magic Clock". She then steals a time-freezing clock so the two of them can be together for eternity and tries to marry him against his will. When Roba refuses to kiss her at their wedding, she threatens to rip a hole in the fabric of the space-time continuum.
Harley Quinn from Batman. She made her first appearance in Batman: The Animated Series as The Joker's girlfriend.
- Also, Firefly in "Torch Song."
- The Mad Hatter, for Alice.
In one episode of The Boondocks Granddad meets an incredibly hot woman over the internet. We later learn that she's also a martial arts master literally Raised by Wolves, has a very bad history with previous boyfriends (whom she killed) and has a friend who gives her terrible advice. The episode ends with the Freemans managing to calm her down after which, her friend drives her to kill herself, to the relief of the other characters.
Amora the Enchantress in Avengers Earths Mightiest Heroes is this to Thor. She takes out her anger from being rejected by him in battle with Thor and his allies frequently. This follows along with her comic book character.
On Squidbillies Early Cuyler for his ex-wife Krystal
- "I love you (waves knife around), Imma kill you bitch."
An episode of Regular Show has Starla, Muscle Man's old girlfriend. She falls in love with Mordecai, and he starts dating her just so he can get her and Muscle Man back together. But when Mordecai can't take it anymore and breaks up with her... well...
In The Looney Tunes Show, Lola becomes this for Bugs Bunny. Her song "We Are In Love" sums it up nicely.
Titan is one towards Roxanne in Megamind.
Now, as of the season three finale of Adventure Time, we can add Flame Princess to the list for Finn.
- The Ice King.
- Also Tree Truks becomes this to Finn after eating The Crystal Gem Apple and to turn into Quartzion the Crystal Queen.
In Hey Arnold! at the end of Arnold's Nightmare Sequence we see Arnie go stark raving mad when he thinks Arnold was trying to steal his girl, Lulu.
Ed, Edd 'n' Eddy: Sarah to Edd in "An Ed Too Many".
Word Bot to Tobey in Word Girl.
In the Harley Quinn cartoon Harley was this (by her own admission) when she was 11 years old, the target being a boy named Frankie Muniz; she planned to kidnap him, force him to marry her, lie about using birth control, and have his child. This unhealthy stalking seemed to end with Harley ignoring a restraining order and doing time in juvie, but she kept her crush on Frankie in her subconscious, something that proves useful in the episode's Journey to the Center of the Mind.
Pinky's crush on the protagonist in Pac-Man and the Ghostly Adventures hovers dangerously close to this at times. Pac-Man clearly isn't interested (and is also far more attracted to Cylindria), and Pinky often tries to chase him, one time with a butterfly net and another time with toon-style glue. Naturally, as is often the case with someone using that stuff, she wound up trapping herself. Possibly the most blatant example was in the Valentines Day Episode:

Pinky: Pac is gonna be my date for Valenpac Day... OR ELSE!

Tiffany in Gravity Falls. A character in a Dating Sim Fictional Video Game, she was the typical anime girl character who, in the plot of the game, becomes obsessive and jealous should the player reject her. Unfortunately, this is Gravity Falls, and video game characters often gain sapience and material form here, something Soos finds out after he becomes addicted to the game and reacting to her as if she was real, causing her to become real. Seeing as being a Yandere is the only thing that defines her personality, the "relationship" quickly becomes deadly.
Possibly the spirit of Spring in the Samurai Jack episode "Seasons of Death". She seems to be seducing Jack in order to prevent him from leaving, and gets angry and violent when he tries to, but the soft smile on her face when he succeeds makes her motives more vague - possibly a Secret Test of Character via a Leave Your Quest Test, or maybe she intends to keep stalking him, but she isn't seen again.
Possibly Becky from The Simpsons episode "It's a Mad, Mad, Mad Marge", depending on whether her confession at the end was sincere or just sarcastically pointing out how silly Marge's accusations were.

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