In novels/narration, the main character using really nasty terms to describe their "best friend" or "love interest". You know the ones, usually goes with the "my name is Mary Sue" narration while getting ready for school and then "this is my best friend Bestie who's so dumb and really annoying but for some reason despite being so perfect I can't get a better best friend so I'm stuck with them". Like if your MC is going out of their way to introduce their best friend with all their negative traits, what you've actually done is introduced your MC as bitch. Often goes hand in hand with "I'm perfect and there's nothing wrong in my life but it's awful anyway"
The super obvious colour coding. I get it's so we can tell them apart and usually used only in kids shows, but come on. I don't want to know literally everything about the character just by their colour. Maybe they just like their colour, maybe the colour of their eyes or hair doesn't actually have anything to do with their personality, maybe it's just a colour that suits them.
Redemption without earning it. Because all villains must be redeemed. Anyone who's ever done anything bad must be redeemed whether they like it or not. And whether they've actually done anything to counter their bad deeds or not.
The sudden genre/tone shift without any warning. It's not cool, it's not clever, you're not being subversive. Things like Madoka managed it because there was something off from the start. The shift was foreshadowed well enough because it was never a happy go lucky show. Many series miss that foreshadowing bit and just dramatically shift without any even subtle warning and I just go "I didn't sign up for that".
The love interest who's forgive everything because she's the love interest. It doesn't come off hugely often but it really puts me off when it happens and it is usually a female love interest and male hero. She betrayed him, depending on the magicalness/invincibility of you can see her shoot him or attack him over some misunderstanding despite him constantly risking her life to protect her, she's been a spy for the opposite side, she's been cheating on him. And it's all forgiven the second she cries and says sorry because the power of his love for her means she is instantly redeemed all in the space of five minutes and we should love her as much as he does.