for a few of my boys:
rahart:
while he appears angry most of the time, he's usually just something along the lines of annoyed. when he's actually angry, he is very visibly emotional, showing a lot in his face. he'll be choked up, most likely crying, and his accent tends to come through. he'll isolate himself or disappear w/o warning for awhile - him going missing for long periods of time was quite problematic when he was still a teen.
he doesn't do it so much now, but he still tends to wander from time to time. he also tends to act impulsively - whether it would be getting himself into fights to relieve tension or put himself in other dangerous situations
kiyung:
he's very loud and will yell, scream, kick, punch... he's more or less a full tantrum-thrower. he breaks things, sometimes. usually the only way to deal w/ his anger is to just let him tire himself out, bc u can't rly get a word in or intervene. his bf is p used to his outbursts and will just ignore him until he's done. he behaves this way frequently
elian:
elian will give the silent treatment if ur the cause of his anger, while if the reason is smthn else he'll rant and curse a bit at whoever will listen. he'll do this with the expectation of getting an agreement, opinion, or advice from whoever he's complaining to. his silent treatment is deliberately done to piss off the person who's the cause of his anger, and since he's incredibly stubborn he can keep it up for days or weeks until he gets over it (depending on the severity of the issue)
jae:
another silent treatment kinda guy, jae won't speak not only to the person responsible but he won't speak to anyone at all - not even to himself. he doesn't talk much as is, but intense emotions make him mute. those who don't know him well won't be able to tell if he's angry by looking at him, but those that do would notice tenser expression compared to his usual blank look
if he's got a lot bottled up he'll let loose by scribbling in a book or writing in his diary before ripping out those pages and throwing them out
TK:
he'll be serious and monotone, which is very jarring when one is used to his normal cheerful demeanor. he can be terribly petty and has an underlying 'mean girl' attitude that will make him act deliberately rude to whoever or whatever pissed him off
alistair:
he rarely gets angry, as his depression and anxiety is normally too strong for him to act out in any way. usually he'll just rip a cone and stare at the ceiling for awhile with some music playing. the only time he's rly gotten MAD mad it ended up being a whole lot of weirdly cohesive word vomit that resulted in him dumping isaiah completely out of his life (temporarily)
that was a very drastic result of years and years of angst buildup, so anger is typically dealt w/ alone for him
eoryth:
he is a violent man who will 100% lash out and injure others when angry (sometimes critically, or straight up kill them if it's bad) - only two ppl seem to have the ability to calm him down in a rage, being his only support ada and ex-childhood friend leiko