What is the most annoying personality trait/trope of a character?

Same here, I really really hate clingy anime girls that can't take hints, like seriously jeez.

As for what u said in ur question intro, I couldn't have said it better myself xD. Clingy characters are the death a real romance and they just seem desperate.

As far as romance goes, I prefer characters that are more natural and ridiculously less obvious and that have personality.

(PS: the picture posted is from the anime called "Say I love You", it's very sweet and I wish all romance anime were similar to it, xD)

The typical Mainstream Shounen MC like Naruto, Luffy and Natsu
These types of main characters are so cliched that I just frown seeing them time after time again -_-

The whole main female character hitting either the MC or the other characters for comedy purposes. Like literally, it's in FT, Naruto, Inuyasha and other shounen anime. It's not funny and it's so annoying especially when it's over a silly reason.

1.Whiny (like Shinji from NGE and Yuki from Mirai Nikki)
2. Characters hitting other characters for no reason. (Alot of times I can deal with it and sometimes the characters actually deserved it. BUT there are sometimes they go overboard with hitting that character. It's like why would you do that.
3.I dislike when some character perceive it's their duty to do something but in all actuality. Said thing wasn't needed at all. Some characters are overly committed.
4.Self-pity. (this kinda goes in with the whiny and yet not) People who constantly say I am not strong enough when it reality they are much stronger than they think. It's so annoying to me.
5.Clinginess for me as well.'
6.sexist characters

I am pretty sure other types would come to mind but as of right now I cannot think of others.

Okay, I'm prepared for the hate. But I'm about to be brutally honest.

EXTREMELY SHY, SOFT-SPOKEN, AND WEAK-WILLED 'CINNAMON ROLLS' ARE MY BIGGEST PET-PEEVE IN ANIME.

These types of characters are mainly found among female characters, and unfortunately, many, many of the 'bottom' characters in yaoi. And these characters just make me want to DRIVE A SCREW-DRIVER INTO MY EYE (excuse the gore, please).

They're so weak-willed, and always do nothing but whine or hesitate. Like, get a freaking move on! You're not being cute, you're being annoying! And I hate it even more when they only exist in the anime to obsess the main character! Or some other main love interest! It's annoying!

Now, there are the types of cinnamon rolls that are similar. They are, too, cowardly, hesitant, doubtful, etc. Except there's one big difference... THEY HAVE CHARACTER DEVELOPMENT. THEY LEARN TO NOT ONLY OPEN UP TO OTHERS, BUT TO LOVE THEMSELVES. TO EMBRACE THEMSELVES. To stop being such a pitiful thing, and get a freaking grip!

And honestly, I mainly don't like these kinds of characters due to the fact that they're always being taken advantage of by not only others, but the main character himself/herself. Manipulating feelings or actions should not be glorified... ever!!

Tsundere characters. Nuff said.

characters that are too perfect and flawless. they are good in everything and this type of character tend to annoy me all the time it makes me want to smack my computer screen

Clingy is annoying >_> But what I hate is characters that are tsundere just for the sake of having a tsundere character in the show. They have no character arc whatsoever. Don't get me wrong, I really like tsunderes, but not when they are this generic and annoying ~

Houki Shinonono from Infinite Stratos is a perfect example

1. Male Tsunderes.

2. Genki girls.

3. Dudebro badasses.