The last character you really hated

[Artoria Pendragon]

Shinji from Evangelion.
Shinji from Typemoon franchise.
Orihime in Bleach.
Naruto.
Sakura.
Lee.
Actually just make it every fricking character in that series with the exception of maybe Jiraya, Sasuke, Kakashi 'n Itachi. Oh and Haku was nice.

Throw in entice one piece.
Lucy from Fairy Tail.
Everything from DBZ. Oh fuck I hate DBZ so much.

Postman Pat.
Bob the Builder.
Chromie.
Every loli in existence except Kiss-Shot Acerola-Orion Heart-Under-Blade & Shalltear Bloodfallen.
Every gnome in existence.
Thrall.
Garrosh.
Actually just make that all orcs ever.

Every nopon ever in Xenoblade franchise. I'm not really feeling it.
Every lalafel ever in Final Fantasy franchise. Too bad it also hits Shantotto.
Snow. Barret. Aerith.

Hmm. I hate a lot of characters. Frankly, most characters. It'd be easier to say which ones I don't hate.