I'ma just throw out that I don't hate characters for any particular reasons. I mainly hate them because I got so sick and tired of fans wetting their panties for the most god awful reasons. So here we go:
My most hated characters are the ones that are super popular for no reason.
Best example of this is Matt from Deathnote, Just a pretty boy who dies after being in only 2 scenes and yet he's stupid popular with the female audiances. When did Character development not matter anymore?
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Also these I do hate for reasons:
All the characters from School Days -
Not only [pretty much] every character here a psychopath in disguise, But. . the main character, you Enjoy his death. This series was pretty much more real then most other School romance in the fact that People do cheat on each other, alot. This is true, But I didn't need to be slapped in the face with it so ******** much that I wanted to throw up. I stopped watching this show and just read about it, watched the last episode and then said Finally its done.
Lucky stars cast
Whut? Dunno, something about this series in a whole urks me, Every character I cannot stand.
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Inuyasha - Inuyasha/Kagome
I really really didn't need to see Kagome and inuyasha play a love dance for 100+ episodes in which it always ended up with inuyasha being a little broody b***h pretty much. Kagome too would just end most times when they are getting romantic with a "Oh kikyo ehh, SIT BOY, I'm going home lawl blah blah
-.- At least Miroku/Sango was amusing.
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Gundam Seed Destiny Shin
I loved gundam seed, But I hated Shin, I found myself speeding through parts of the episode just because I was tired of him being a ******** annoying little brat. =/ I never skipped any slow parts in Seed, Even with the annoying Flay but with shin, Too much shin made me overload and wanted to rage.
^ These are my many picks