Coop: "This guy sicked a giant worm-thingy on me, chased my pals around with zombie-robots and made me break a perfectly good Photonic Stabilizer! I'm putting you in a hurt-locker and slamming the door, junkman!"
RainbowDash is perpetually hot-tempered and aggressive, often reined in by Applejack.
Sunset Shimmer of the Equestria Girls sub-series is significantly quicker to anger than Rainbow Dash, and much more reckless, although she's very good at improvising in chaotic situations. She's also distinctly fire-themed.
Muscle Man from Regular Show has his moments when pranking, making jokes or partying, but none moreso than when he flips out.
Ruby from Steven Universe has EXTREMELY intense emotions. When she gets angry, she's consumed with burning (literally) rage.
The Tick: I am mighty! I have a glow you cannot see! I have a heart as big as the moon! As warm as bathwater! We are superheroes, man, we don't have time to be charming! The boots of evil were made for walkin'! We're watching the big picture, friend. We know the score. We are a public service, not glamor boys. Not captains of industry! Not makers of things, keep your vulgar moneys! We are a justice sandwich; no toppings necessary! Living rooms of America, do you catch my drift?! Do... You... Dig?
Quickstrike of Transformers: Beast Wars fame. The fact that he's the only Maximal to join the Predacons permanently, voluntarily and with great enthusiasm says something. Most who join the Predacons are either sneakily programmed to (Blackarachnea, Inferno), are tortured into obedience (Rampage), or end up defecting (Rattrap, Dinobot (who was a Predacon to start with anyway)). Quickstrike was simply turned on by murder, torture and genocide.
Dinobot will not, and cannot lose. "What is a warrior without weapons?" "A warrior still!"