[@ZAVAZggg] The key part of a roleplay is that its cooperative. If you write a character with a specific story or specific arc you want to tell then you are effectively discounting any input other characters could have on how yours develops. At that point you may as well be writing a book or a short story. The point of this format is telling a story together.

Like, looking at my character, I'm interested in exploring how trauma at an early age shapes her outlook on life but beyond the basic theme, I'm not deciding how that will play out because maybe the others do something unexpected which causes a gear shift in her arc. The point is ti play off one another, not write separate stories in the same space.

If what you know is constantly being angry, then write someone who is angry. Maybe utilizing those impulses in a space like this where the consequences are fictional will help you deal with them in your life. The meme about D&D secretly being therapy is extremely accurate and applies to this medium in a very similar fashion.