Aang is extremely attached to his pet Sky Bison, Appa. (Understandable, since Appa was trapped in ice 100 years with Aang, and is the only being besides Aang that survived the Air Temple raids.) During "The Chase," he remained calm and good-natured in the face of Toph and Katara's bickering, continued assault by his enemies and sleeplessness, but he screamed at Toph when she dared blame Appa for the problem. This was some Foreshadowing of Aang's huge freakout when Appa is kidnapped, which lasts for two whole episodes, the first one which he spends consumed with uncharacteristic rage and pessimism, and actually goes into the Avatar State when facing the kidnappers, and the second one where he represses his emotions. He snaps out of it eventually, but does scream at the brainwashed Joo Dee when she tries to get in the way of their search for Appa, and shows unrelenting determination to find him. In short, don't mess with the Avatar's bison.
Also, NEVER put Katara in danger in front of Aang, or even just PRETEND to do so. It is THE BEST way to push him into the Avatar State and guarantee complete destruction for a hundred meter radius.
And, don't start a 100 year old war. It's not smart. Otherwise, you get THIS.
Katara herself has three such buttons. 1. Anything related to her mother's death. 2. Harming Aang. 3. Anyone who betrays her trust (see: Jet and Zuko).
The above scene also shows that the Emotionless Girl Mai is content to quietly sit on the sidelines as her best friend and nation conquer the world, only entering battle because she's bored. But when her boyfriend's in danger, it's time to kick ass, take names, and throw knives.
Sokka is usually a pretty laid back guy and nothing usually bothers him, but whatever you do, ABSOLUTELY DO NOT harm his sister Katara or his girlfriend Suki. Even if you're the Avatar.
Also, Admiral Zhao's berserk button comes in the form of the most epic burn Aang has ever delivered:
Aang: I don't know why, but I thought you'd be better than Zuko!
Aang: AHOY! *Moons Zhao with pants up* I'm Admiral Zhao!
Zuko's berserk button, particularly in the first season, seems to be any reference to his banishment, from anyone other than Iroh. He destroyed Zhao in an Agni Kai when Zhao mocked his scar and taunted him about not being able to go home. He also challenged Lieutenant Jee, who unknowingly hit a sore spot when he called Zuko out for his lack of respect... exactly what Ozai said before burning him.
After seeing his backstory, anyone would agree that being mocked for getting burned and banished is a justifiable reason for freaking out.
Batman listens to Joker's story about how he tortured Tim Drake patiently, but when Joker says, "You're just a little boy in a playsuit crying for Mummy and Daddy. It would be funny if it weren't so pathetic... oh what the heck, I'll laugh anyway." and laughs at Batman, he flips his shit, to use a technical term, and instantly charges Joker and pummels him, delivering one of the most furious beatings Joker's taken from Batman.
That scene was really one giant Berserk Button for Batman; it just took all of his self control to keep from losing his shit any sooner than he did. But seriously, when he did, it was SCARY. Kevin Conroy had voiced Batman for the better part of a decade up to that point, but NEVER had his gravelly voice sounded as beyond-the-grave chilling as it did when he ground out through gritted teeth, "I'll break you in two." Ironically, Batman soon after LOSES the fight and is at The Joker's mercy, possibly because he was overcome with rage and thus could not fight logically and sensibly.
In the same animated movie, Terry also managed to push the Joker's berserk button by laughing at him.
As has been stated elsewhere, Tigatron is a hippie. A hippie who will blow a hole through you if you threaten nature.
And he found out that destroying "the colony" was a very bad idea when an enraged Inferno almost turned him into soup cans.
Silverbolt, a classic Knight in Shining Armor, is very protective of his lady. Bring any harm to her and enjoy the next five minutes. That's all the time you'll have before the beatdown commences.
It's a really bad idea to mess with, endanger, or — possibly worst of all — flirt with Lydia Deetz. Beetlejuice may be a lazy good-for-nothing, but you don't put a hand on the mortal he adores without paying a price.
Beavis barely notices the massive volume of insults Butt-head throws his way, but don't call him a "butt-knocker". Or he'll kick you in the nads! Also don't insult Metallica in front of him.
The realization that he will never "score" led Beavis to a screaming fit twice. The commotion itself was a Berserk Button on two people: the bus driver in The Movie (after telling him to sit down, but Beavis says "shut up") and a stage manager (who warns the other kids not to piss him off).
Coach Buzzcut may be the high school equivalent of Drill Sergeant Nasty, but so help anyone else who lays a hand on his students...
In the debatably canonical episode "Ben 10,000", Ben has grown up and had a son. Kevin picks up the Villain Ball and messes with said son. Cue vicious pounding by Ben-as-Waybig.
Zombozo found out the hard way, regardless of series, do not hurt or threaten to hurt any member of the Tennyson family around Ben or Gwen (particularly Gwen around Ben and vice-versa) and you'll be lucky if they let you live.
If you harm, or worse kill someone in front of Ben Tennyson, he'll go into Unstoppable Rage mode and beat you to a pulp. Aggregor, Darkstar and Kevin had learned that lesson the hard way.
And Ben doesn't take too kindly to innocent people getting caught in the crossfire either. More than a few villains have inadvertently pushed this button due to the lack of empathy of seemingly lowly civilians.
The 3 main protagonists of Biker Mice from Mars will react very badly if you hurt their friends or damage their bikes. And it's not a very good idea to call Modo a rat
It is discovered in The Boondocks that throwing a chair amidst a crowd of people will, whether or not the chair connects with anyone, instigate a full-scale brawl.
Calm, debonair Vlad Masters turns angry if you call him a "fruitloop". Or mention how he lost the woman of his dreams to an idiot and still can't use his vast fortune to buy the Green Bay Packers. Or suggest he get a cat.
Dick Dastardly absolutely hates it when Muttley curses. As a result, he'll say, "What was that?" . Another berserk button Dick Dastardly has is when Muttley laughs at someone's misfortune. He has various reactions to it.
Muttley adores his medals, and if someone tries to take his last medal away, he'll bite that individual's arm.
Dave the Barbarian may be a wimp, and he may be a lousy barbarian, BUT NOBODY MESSES WITH HIS SISTER!
Dexter's Laboratory: Dexter's future self the scrawny, weak, and cowardly D22, you can beat and push him around, you can insult him and break his spirit, but whatever you do do not break his glasses.
In the series episode that's a crossover with Aladdin: The Series, being called "Jerkules" seems to function as this for Hercules. "Everyone thinks they're so funny when they call me that, but it'sNot! That! Funny!" Well, he was called "Jerkules" by bullies in the original film (presumably a lot), so it's not surprising that it pisses him off. It may also be the fact that they thought they made it up, unaware everyone else also called him that. He also won't be happy if you touch Icarus, and when a super-powered half-Olympian ain't happy, ain't nobody happy.
He also didn't like it when Phil accuses Meg of being "two-timing, lying, scheming" and that she doesn't love Hercules. He learned Phil was right, but also Meg was unwilling to work for Hades anymore.
Disney's animated short Lambert the Sheepish Lion stars Lambert, a lion raised by sheep (spot of bother with the storks, don't'y'know). Lambert is retiring, and generally the butt of the herd's jokes, even when he's a full-grown lion. When a wolf threatens his mother, though — let's just say the wolf's reaction to Lambert's suddenly becoming "a raging lion" warrants a Trope page on "Classic 'Oh-Shit' Expressions Of All Time".
Do not tell Hortense McDuck something is "men's work". She laid Teddy Roosevelt flat with one punch. Yes, that Teddy Roosevelt.
One Donald cartoon "Cured Duck" was practically created as an excuse to show this trope in action. When Donald is unable to open a window at Daisy's house, he loses it and demolishes her house. She tells him off for his attitude, only to display an even worse temper when he makes fun of her outlandish hat.
In Adventures in Music and Disney Sing-Along Songs, you do not interrupt Professor Owl's music lessons.
Drawn Together: Toot does not like it when you try to take a crap on pizza as a prank.
If you so much as look at Sheila crosswise or threaten Uni (which happens about once a show), Bobby goes into charging mode regardless of who/what the party is up against. And Sheila is just as protective of her little brother and the rest of the party; when she thinks Hank has switched sides, she's ready to attack him despite being shorter and much lighter in build.
Don't try to harm, capture, take or threaten Timmy Turner's fairy godparents. Timmy has magic on his side, and as Abra Catastrophe demonstrated, he uses it to beat your ass to Pluto and bounce off to the other side of the Universe to show he doesn't fool around.
Do not bring up March 15th in front of Crocker. Bad things have happened to him on that day...
Wanda and Cosmo are extremely protective of Timmy and each other, though Wanda is more likely to show it. When Jorgan, the toughest fairy in the universe, threatened Timmy on one occasion, Wanda's hair burst into flames and she scared him! And as for Cosmo, when the Destructinator threatened his family, he turned into Godzilla to pummel him into the ground.
Stewie: We don't like your cooking, your stupid karaoke nights, and we especially don't like the way you hump that chair in the den! New Brian: Well, Rupert seems to like my humping. Stewie: What did you say? New Brian: Rupert. Humped him for two hours last night. He just lay there and took it. Stewie: Did he? New Brian: Yeah. And now every time you're sleeping with him, he's gonna be thinking of me. Stewie: Hmmmmm.
Stewie chops up new Brian and throws him into the trash. So don't mess with Stewie's bear.
In the episode "Fat Guy Strangler," while Lois' mentally ill brother, Patrick, is visiting the Griffins, Peter dresses as Ralph Kramden (from The Honeymooners) and uses his catchphrase "Pow, right in the kisser." This triggers a flashback for Patrick, who as a child had walked in on his mother having sex in the kitchen with an obese man dressed as the famous Honeymooners protagonist — this triggered a traumatic episode that eventually saw him sent to a mental institution — and he goes on a rampage, killing or seriously injuring obese men in Quahog. Eventually, he targets Peter, who eventually escapes his predicament (only when Lois shows up to talk Patrick out of it, claiming that she is assaulting his "girlfriend," Marion).
From Green Lantern: The Animated Series. Razer's already The Berserker, so it doesn't seem like you can get him madder than he already is. Hurt Aya or reveal that you killed his wife, and you'll quickly discover that he can get much, much angrier. And when you've got a ring that becomes stronger the angrier you are, the results are quite spectacular.
In the episode that introduces Nergal Junior, his berserk button is being called a "freak". Given that his father is a monster from the Earth's core who has issues making friends, and Junior's true form is some kind oftentacled monstrosity, he's understandably sensitive.
Also, do NOT go near Grim's trunk.
Never, EVER touch Skarr's garden. (He'll give you fair warning, so if you do it, don't say you weren't warned.)
Flippy. A cute, green, beret-wearing war veteran bear who is among the nicest characters in the series. However, if he sees or hears anything, anything that even vaguely reminds him of war in even the slightest way...there are entire episodes that are centered around the psychotic PTSD-induced rampages that occur.
In the spinoff series Ka-Pow, Buddhist Monkey really, really hates vandalism. But then again, the Red Shirt ninjas are asking for it by using martial arts moves to break the necks of flowers and backs of books.
The normally sweet Giggles totally loses her temper when someone harms the environment.
You know Ding-A-Ling Wolf from those Hanna-Barbera cartoons starring Hokey Wolf? Sweet, innocent, a little naive, big soft Puppy-Dog Eyes? Well, whatever you do, DON'T choke, jump on, or try to hurt Hokey in a major way unless you want to be beaten with a tree branch by this little guy.
Gaz is generally willing to leave people alone as long as they leave her to her video games and pizza. Otherwise she will stop at nothing to destroy you. Notably, she won't scream and yell like most of these examples — she's far too scary for that.
Tony Stark from Iron Man: Armored Adventures has no mother, has lost his father, and as such is extremely protective of his friends, who he considers his adoptive family. Trying to hurt them has resulted in the normally calm genius outright trying to KILL the people responsible, and you'd better believe he can do it.
People stealing his tech and in general using tech for evil also pisses him off. And don't even think about making any wisecracks about his father.
Ron Stoppable has a tendency to snap if his beloved fast food chain, Bueno Nacho, is destroyed or taken over by villains.
The other way to send him into frenetic rage is to harm Kim Possible. Lord help you if you hurt his girlfriend. Two of his foes learned the hard way that that is something you just don't do in the series finale. (Not just harm her, the Lorwardians were going to kill her, stuff her, and mount her on a wall as a trophy like some animal!)
And Ron himself is the subject of a berserk button. It's a... hmm... KimPossibly bad idea to bully him, as Drakken, Killigan, and Monkey Fist found out on a time-travel jaunt. Now think about that, three supervillains thrashed by a five-year-old girl.
"A Sitch in Time": "YOU'RE the reason I moved to Norway? You're the reason I've been eating MEAT CAKES?"
Also Wade, after Team Impossible spikes his computer when he attempts to hack them. He comes back later in the episode in person to deal with them. "Nobody, nobody spikes my system!"
Do not speak ill of propane in Hank Hill's presence. Amusingly, in the episode "Hank Gets Dusted", a Reality Show producer suggests doing this to get a rise out of him, but Hank's cousin Dusty Hill says "There are some lines a man just doesn't cross!"
And don't criticize Peggy's intelligence or Spanish skills, no matter how true you are.
Don't turn down a Tom Landry Middle School tradition. You will die.
Tenzin: (Face going red) Don't bring my mother into this!
Tenzin: (Face goes purple; Gasps) Meelo no! That's not a toilet! (Embarrassed) Oh dear...
Much more seriously, telling Tarrlok that he's no different than Amon.In a way, it's true, since Amon is his brother. And also they're both just like their abusive dad.
Mako's Big Brother Instinct leads to this trope if anyone tries to hurt either Korra or Bolin in front of him. When Bolin was kidnapped by the Equalists in "The Revelation", he threw one of his captors across the screen Hulk-style - er, Korra-style. And Mako himself admits in "Endgame" that he "was losing [his] mind" after Tarrlok abducted Korra in "When Extremes Meet."
Don't ever say Mr. Sato's actions will be disapproved by his late wife. not even if you're his daughter.
Charles Foster Ofdensen is a normal-looking businessman, a savvy manager, and a very clever lawyer in charge of metal sensation Dethklok. DO NOT threaten his "Bread and Butter". Just don't. He will END you.
Do not threaten the life of any of Nathan's friends. He will cut your hands off with a broken snowglobe.
Pickles' Berserk Button seems to be his family. Specifically, his brother, Seth. At some point in each of the episodes Seth is in Pickles tries to kill him.
And if you're at a concert with Toki, do not stand in his personal space and cheer in his ear. Especially if he's sober. Good lord.
In "The Return of Harmony - Part 2", the idea of Discord emerging triumphant is enough incentive for Fluttershy to stop crying and push herself to her physical limits while the ponies are chasing Rainbow Dash.
Twilight Sparkle: If you can't catch her, Discord wins! Fluttershy: That. Big. Dumb. MEANIE!
Whatever you do, NEVER, EVER break a Pinkie Promise.
Normally, the Cutie Mark Crusaders don’t take kindly to being pushed around, but when their clubhouse was taken, that finally set them off.
Whatever you do, don't ever disrespect Shining Armor’s wife Cadance in front of him. Twilight learned this the hard way when she called out Queen Chrysalis who fooled everyone else with her impersonation of Cadance during the wedding rehearsal.
Never come between Spike and Twilight.
Never disrespect Rarity.
After Rarity states that she's above challenging Trixie:
Trixie: Ooooo; what's the matter? Afraid you'll get a hair out of place in that rat's nest you call a mane? Rarity: Oh, it is ON!
Best not to threaten Spike in her presence either.
Never, ever, threaten Cadance’s husband Shining Armor or anyone else she cares about, or else...
Winning against Discord’s mind games. In which case he will promptly cheat to win.
In Twilight's Kingdom Part 2, Twilight tries to avoid Tirek when he first tracks her down... until he blows up the library. After that, she turns all her magic on him.
Ned's Newt: As I say, don't ever call Newton a "big blue doofus".
Never, EVER touch King Julien's feet. And if you ever decide to skate over them... well, say hello to Julienderung.
"Friend-in-a-Box" suggests that a Freudian Excuse may be involved. After Mort becomes obsessed with a portable video game, Julien goes out of his way to try and force Mort upon his feet, claiming that he wants to experience the joy of kicking Mort off. Eventually, he even goes so far as to beg Maurice and the penguins to pay attention to the royal feet.
NEVER forget or ignore King Julien Day, for that matter... "Which forgetter is next for the whooping?! Come on, I want you to hurt LIKE I DO! UAHAHAHAHAA!"
Rico's berserk buttons are messing with his dolly or hurting his friends, especially Skipper.
Okay, so he doesn't go berserk, per se, but Skipper really doesn't like it when you call him fat, or any of its synonyms. He likes to claim it's muscle.
Perry the Platypus doesn't usually turn Dr. Doofenshmirtz over to the authorities because he enjoys foiling his plans. But in "Journey to the Center of Candace", when Doofenshmirtz builds a device that "will destroy anyone who can't make up their mind," Perry realizes that this will put Phineas and Ferb (who were earlier having difficulty deciding what to do today) in danger. He immediately attacks the doctor, handcuffs him to a pipe, and calls his boss to send reinforcements to arrest him. He may just be the family platypus, but don't mess with his kids, even indirectly.
Doofenschmirtz has what may be his own Berserk Button in the form of his daughter Vanessa, as evidenced by the fate which befell a biker who attempted to pick her up.
Doofenschmirtz: She's sixteen! (zaps with ray gun)
Phineas once got angry at Candace for calling one of his and Ferb's plans "stupid". It only lasted about five seconds, but for Phineas that's pretty extreme.
Threatening or causing harm to his sister (unintentionally or not) is also a bad idea. Phineas got downright scary when Buford was responsible for turning Candace into a flygirl.
Isabella seems displeased whenever someone uses her Catch Phrase, especially on Phineas. Obviously, she's perfectly fine when it's Phineas using it on her.
Though non-violent, Shaggy has a variant: if your criminal scheme threatens to cancel one of his beloved mini-golf tournaments, he will instantly morph into a Sherlock-Holmes-caliber detecting genius and solve the case so fast even Velma's left wondering how he did it.
On Scooby-Doo! Mystery Incorporated, Velma gets angry enough to kick down two tombstones when she thinks Shaggy is trying to weasel out of going to the prom with her. In a later episode, Shaggy chooses being friends with Scooby over being Velma's boyfriend, causing Velma's Berserk Button to be pressed before she collapses into tears.
In the crossover episode with Dynomutt and Blue Falcon, Shaggy will kick your ass if you mess with Scooby.
English kid Pip can't abide being mistaken for French. In the episode "Conjoined Fetus Lady," the other kids on the dodge ball team actually make use of this fact, to take advantage of his unstoppable rage.
Eric Cartman apparently has at least four Berserk Buttons. One is any references to him being fat or overweight. Another is being compared to Family Guy. He also really hates being conned out of his money; it's in your best interests to give it back or he will do something really horrible to you. And then there's insulting his mother; when Grandpa Marsh does so, he flies into rage and starts to beat the crap out of him, although Stan and Kyle restrain him before he can do any real damage.
As for Kyle, don't call his mother a bitch. Justified, as his mom isn't exactly the type of person you'd want to piss off.
Kenny (as Mysterion) gets one when he tries to tell the rest of the kids that he can't die, and Kyle says it'd be pretty cool to be immortal. Kenny, who knows better, flips out just a little bit.
He gets another one in "The Poor Kid". Don't mess with his little sister.
If you don't want to piss off Mr. Mackey, don't take a dump in the urinal. Or ruin the tooth decay play he worked on for six years, whether it's by accident or not. Or touch any part of the overwhelming trash and paper hoard that suddenly materialized in his traditionally clean office.
"Don't you touch that! That's not something to throw away! If you throw that away, I will RAPE you in the mouth, m'kay! I WILL RAPE YOU IN THE FUCKING MOUTH, M'KAY!
Whatever you do, don't insult Candy from Space Goofs. The gang of bats that took over the aliens' house learned this the hard way.
And for the love of God, do not touch Mr. Krabs' thermostat! (Or play in his yard.)
And for that love of God, do not hug and crush Gary's shell. Or touch his...undercarriage.
And for the love of NeptuneDONOTput Puffy Fluffy in a house with another pet!note Spongebob could've realized it the hard way, but he had to be a Jerkass toward Gary, but admit it he was more of a jerk in that episode.
Don't ever, ever say "day off" or "overtime" to Mr. Krabs. And if he sees you pick up a penny off the street, you might as well just go ahead and buy yourself a coffin.
In Superman: The Animated Series and Justice League, hurting his friends is an obvious one for Superman, but Darkseid just by existing is a Berserk Button for Superman. Darkseid is the only villain that Superman is fully prepared to kill (well there's Mongul too, but a lot passion was involved with that). Given how monstrous many villains in the DCAU are, the fact that Darkseid in general is a Berserk Button for Superman, and the only villain he wants to kill, is quite impressive on his part. In the Justice League episode "Twilight (of the Gods)," Superman goes into a blind range and beats up Darkseid just for showing his face.
Sym-Bionic Titan: Don't threaten Ilana when Lance is in earshot. Try to harm either of them, you end up upsetting Octus.
TaleSpin: Never, ever, try to harm Kit, Rebecca or Molly, or else Baloo will make you sorry. The only thing that's an even worse idea is doing anything to the Sea Duck or insulting Baloo's piloting abilities.
Raphael of Teenage Mutant Ninja Turtles, as shown in the 2003 cartoon episode "April's Artifact", hates bugs. PERIOD. He even gets pushed too far when, not long after one of the hornets has slashed and paralyzed him for a while and he recovers from the paralysis not long afterwards, and says "Bugs... must...PAY!"
Robin does not like being compared to Slade. At all. (Most noticeable in the Apprentice episodes, he manages to get over it but it's still a sensitive issue for him.) However, this is partially true, since he's as obsessive as Slade. Deep down Robin does realize this, but doesn't want it to be point out. This may be why he's so obsessive with Slade, as he made him something he doesn't want to be and always many steps ahead of Robin.
There's also one episode that's all about Beast Boy's Berserk Button taking physical form (it's a long story) and hunting down a jerk that put Raven in a coma. Surprisingly, the romantic overtones were completely unintentional.
Slade hates it when someone makes him lose his cool, outdoes him, or when his apprentices betray him.
In the Droopy cartoons, if you dare do something petty and cruel to something Droopy dearly values, he will walk up to you and dispassionately say, "You know what? That makes me mad," and then demolish you.
And just for the record, even his son in Homesteader Droopy kicked a corrupt sheriff's ass for taking his baby bottle.
Also in the same episode, we learn it is unwise to give a stuffed moose a mohawk.
James the Red Engine does not like to be reminded of his particularly outstanding screwups. Especially the time his crew had to borrow a passenger's bootlace to repair a leak he'd caused in a brake pipe.
Spike has two main ones, among others. Number 1: don't wake him up while he's napping; and Number 2: don't ever touch his son.
Ironic to say, in an episode called The Milky Waif, Jerry has one. Tom found that out much TOO LATE: Tom was smacking Nibbles with a fly-swatter and when Jerry saw the red welt on poor Nibbles' behind, Jerry ROAREDbefore giving Tom a quality ass-beating.
Tom's master from the Gene Deitch shorts has very sensitive buttons. His buttons from his three shorts are: 1) Don't mess up his fishing trip. 2) Don't interrupt his barbecue. 3) DON'T touch his guns.
And while we're at it, DO NOT mention Jose to Alejandro. Oh, and don't call him "Al", even though Cody tried to use it against him once and Owen calls him that because he can't say "Alejandro" right.
Owen is Alejandro's Berserk Button.
Be you Heather, Courtney, or a baboon, do not harm Cody in any way in front of Sierra.
Zoey, the usually calm and nice girl tried to kill Scott after he eliminated Mike, but her true berserk button was shown when the medallion Mike gave her broke, even Cameron was shocked at Zoey's transformation.
Touch Eva's MP3 or speak ill of her name, and you're as good as dead.
Don't mention Chris' age, interupt him, correct him, or play him like a fiddle (As Scott learned).
As Sierra learned don't ramble on about his personal life.
In "Agendas" he does not take being stuck in a pod wearing his Cadmus suit again very well, even though it's ostensibly meant to heal him.
Do not taunt Miss Martian about losing Conner's love, the team's approval, or being banished back to Mars for being a White Martian. When Psimon did it, M'gann put him into a coma.
In Season 2, don't belittle or mock her adoptive brother Beast Boy and don't kill her teammates especially if you're already a traitor.
Messing with Jamie Reyes' friends in any way, shape or form is a bad idea. Maurice should be grateful Jaime just got him arrested instead of listening to the Scarab, considering what it's implied he did to Jaime's friend Ty.