One of the things that I dislike is main characters that are OP for no reason. I'm completely fine with it if there is a reason for it and there is at least a little chance that something or someone can best him. However, when a character is OP for no reason with virtually no weakness, it seriously hinders the story (at least to me) in a sense that you never feel like that character is threatened and that the protagonists just won because he was lucky and blessed with being OP for no reason at all. How to fix it is honestly just try to put a reason behind everything.
I don't know if this is common or not, but another thing that I dislike is when two characters get into a relationship right away. I guess you could call it the "love at first sight" but then it just all happens immediately and the relationship feels so fake cause in reality that's not how it works. I like relationships where it takes time to build a relationship and there is a reason two characters like each other, even if its just they've spent a lot of time near each other whether it was optional or not.
Another thing, fake deaths. It's fine to me if characters go through unrealistic amount of stuff and still survive because it's fiction, but when someone totally makes it seem like a character just died (such as expressing through the other characters' reactions) and then miraculously survived without an explanation, the reader or watcher etc. can loose all trust in the author/director/etc. and so when something actually does happen, the readers/watchers may not believe it or take it seriously.
I'm not sure if this counts as a trope or cliche or whatever but also cringey friendship stuff. You probably know what I'm talking about. How to fix this is simply do it through actions or other indirect ways that a reader/watcher can still pick up on instead of a character explaining it forever in cheesy dialogue.