I can't think of anyone I hate, but I reaaaally dislike that elf housecarl woman from Skyrim. Why and how the Jarl of Whiterun hasn't stabbed her himself yet is a big mystery to me.
Hmm...I suppose it would be Bernkastel from Umineko. While I understand that she is supposed to represent a way of looking at detective fiction and how truth plays out, I simply cannot agree with how she uses any means necessary to achieve her goal. When Battler punched the fuck out of her in EP8 I seriously have never felt so refreshing. This is one bitch that deserves to die.
Waluigi, still stupid as shit. Gnar from LoL, how does people cannot hate him. Sana from Pokemon X/Y, the most dumbest character in the Pokemon universe. The third boss from the game Catherine, worse than thousands of crying babies at once.
Came out as a funny, enjoyable and favorite character in Dragon Age: Awakening. Turns out he merged with Justice and become a much more serious character in Dragon Age 2 (still acceptable) + a bit of a whiney ass. But in the end he fucked up the chantry killing innocents, just cause he wanted to spark the war between templars and mages. And the best part is, hes the only mage with a healing spec (if hawke is not a mage). Good luck fighting the arishok without revival.