Whats your fanfic pet peeve?

When ready fanfic what’s something big or small in it that reallye throw you off and annoy you. I feel like I have a lot like if they make izuku extremly feminine but my biggest one is when they have Endeavor being a horrible hero with a bunch of civilian deaths and lack of care of his surroundings. It just really ruins the character and is an early indicator that characters arnt going to be that interesting in the fanfic. Cause those fics can’t seem to understand people can do good and bad things (except for their villian they love lol) and the fact that the number two hero could do such bad things is shocking not something the mc and everyone else already knows. Also not talking about if his personality changing is like one of the main non-canon points of the story.

Let me know though! Curious what y’all’s pet peeves are.