Okay, here's some characters I dislike and why :3
Naraku (Inuyasha)
I usually like villains, but this guy is too much. I think he's a huge coward, and I hate how much pain he puts people through. But, he is the antagonist, so I guess he's doing his job XD
Naruto (Naruto)
That kid, is so annoying. I think that's why I can't stand the series anymore, the main protagonist annoys the crap out of me. All he says is "BELIEVE IT!" I hate that. Anyone who says that now I literally slap them.
Seto Kaiba (yugioh)
Ok, he has to be the most SKEPTICAL anime person EVER. He annoys me so much how he's given proof of something, and he still won't believe it. "Kaiba, 2+2 is 4, there is proof of this..." "nope. 2+2 is 5." honestly. That's Kaiba for ya
Orihime (Bleach)
I've seen few episodes of this show, and she already annoys the crap out of me. Something about her really gets me. Plus she has oversized ****s. Tell me, does an anime girl REALLY need those? Exactly.
I've got more, but i'm done ranting for now xD