by the leader wannabe's do you mean those that goes around shouting " I'm gonna be Hokage " and " I'm gonna be the pirate king " or something?
You mean how they look so sweet and lovable when the MC pays attention to them and only them but, the moment the MC talks to another girl they become complete psychopaths ?
Tsundere and Gullible. Tsunderes, especially violent ones, are the easiest way to put me off something. Sorry, nope not going to read it. It doesn't help that violent tsunderes are almost always accompanied by a weak willed MC who is willing to take it. Just smack her back, 95% of the time you're stronger than her anyway. Gullible I think is fairly self explanitory. I wanted to also pick wimpy, but these two (tsun/gullible) are more important. I would much rather an MC who realises that he doesn't want to fight and accepts that he isn't cut out for it, than someone who constantly gets put in bad situations because he is an idiot.
that is the part i like best. . . .though maybe they wouldnt be so disliked if they were just openly hostile instead of trying to appear different to the MC.
The main characters that are my killjoy usually have more than 1 of the things proposed. The worst for me is when there is a combination of 2 of the following 3 traits: "wimpy", "gullibe", "obvious" . It makes me vomit blood when all 3 are together. There is also "self-centred". Combined with "greedy" and "overconfident", it's just horrible. Then there is "Evil", "man child", "boy who look and act like a girl". Can't handle it no matter how good the story appears to be.