What characters from movies/TV do you hate?

"Sharon Agathon" is an anagram of "Argh! Oh no! Satan!". Coincidence? Yeah, probably, but entirely appropriate as (firstly) she's the only Eight who never has any truck with Boomer's genocide-is-bad-mkay-so-let's-be-awesome-to-each-other naiveté and (secondly) it's what Karl will say when he wakes up in the Ninth Circle of Hell and finds her chewing off his face, self-righteous backstabbing über-misanthrope that he is.
Only kidding. He meets all but one of the criteria for the ninth circle.

Ok, full disclosure: I was very sympathetic to Athena even into season three (and I mean in a "Leave Britney alone!" kind of way). But it eventually became clear that the weight of evidence was against her from an anthropic point of view. Shooting Natalie, when you think about it, kind of telegraphs that her allegiance was not to the humans. She was prepared to sacrifice herself, Helo (who was on the ailing baseship) and arguably Hera in order to protect that cylon Resurrection Hub, or at least that's the case if the writers knew what they were doing.

Great character and well fleshed out but he ordered hits on D'angelo and Wallace. He got his comeuppance in the end.