I didn't hate Suzaku as much in the end. Still, during the run of the show, Suzaku overtook Sasuke as my most hated character in all anime.

I also really hate Kaede Sakura from Kampfer. How self absorbed can a person get?

Also Shin Asuka from Gundam Seed Destiny. I mean, emo.

EDIT: I also despise Amartie from SAW II. Disgusting arrogant prince character that looks all shota.

Sapphire seems to have opened a can of worms. I feel there is so much more I can contribute to this thread.