I hate Mas Amedda from Star Wars, for the sole reason that he's Chagrian who looks like he's very drugged up.

Sonic.....

And I also hate Milo from Mars Needs Moms; seriously, what a shit bag -.-

Midna. Despise her for several reasons.

The characters of Teen Titans Go of course, for obvious reasons.

I'd also like to add Mary Sue from Fairly Oddparents season 10 (not addressing her by the name she was given). If you don't know what a Mary Sue is, basically it's a character with no flaws and is invincible in every way, shape and form. In the Fairly Oddparents, Mary Sue is just that and then some; her very existence contradicts the rules established in the show and that just pisses me off. Fuck Mary Sue >:(