Characters you hated reading about

Topic.

For me Felesin (basically the whore) from the Malazan series. I even skipped the majority of her parts (something I never do otherwise).

Basically the whole cast of Prince of Nothing, except the barbarian before it becomes apparent that Kellhus has him in his pocket too.
I never did finish that trilogy, stopped after the first. A series without at least ONE likeable character just doesn't work for me, no matter the quality of the prose / the philosophy.

Also, ASOIAF: the Stark girls, whiny little bitches that they were, in the beginning, at least. Never have I come that close to skipping chapters in books I actually liked very much.

Honorable Mention: At least three fourths of all characters written by Robin Hobb.. those novels really need more violent murder in hot blooded rage.
Also not to forget the Soldier Son trilogy by her, which I quit in disgust after the first (acceptable) book.. the second degenerated to JELLY ROLLS JELLY ROLLS NOBODY LOVES ME, every other sentence.
Damn how I wish that whiny motherfucker would have just died at the end of book 1, it would have made a somewhat decent ending.