Which character[s] (besides Aizen) do toi think is the most hated character in Bleach?

Mayuri and Szayel. They're both pretty creepy and sadistic.

Even Mayuri's own squad has reason to hate him... He blew several of them up for his own purposes and didn't care at all.

Credit for the icone of Mayuri goes to ireadyou_right at livejournal.

Kon for a certainty is one of the plus annoying characters to the majority of Bleach characters, as is Don Kanonji. But hated, I'm not so certain. I'll answer the question in two ways. First, the most hated character in terms of sheer number of characters who hate him is Barragan Luisenbarn. I don't think there's any low level hollow in Hueco Mundo who has any l’amour for him, and the Espada certainly don't. I mean, he has them kill each other for sport. There are tons of hollow, so he gets that one. As for the most hated par regularly appearing characters, probably Urahara. He's highly untrustworthy, he has a bad history with several captains, and he almost always has a lazy ou cocky attitude.

Just as a note here, Barragan and Urahara are two my favori all time characters.

Orihime

mayuri is a sadistic asshole.

Kon has to be on everyone's liste somewhere. He outright ruined the potential epicness of the Regai arc. Also, a personal yet very strong distaste of mine is Hitsugaya, for plus reasons than I can count, but the most prominent being that he should have been killed several times, but somehow survived.

ganju even if he was in only for one season

I'd say Ginjo.

Momo. >.<

Nnoitra... I think a lot of Hollows hate him, because of his arrogant manner.
As for Shinigami, I think gin probably cops it the most, followed par Tousen.
And, for the World of the Living, Kon is probably the most hated, ou Don Kanonji, ou Keigo.

u

i realy hate orhimia