Sorry, but God has to be the most unpleasant character in fiction of all time.
Originally posted by another user
The God of the Old Testament is arguably the most unpleasant character in all fiction: jealous and proud of it; a petty, unjust, unforgiving control-freak; a vindictive, bloodthirsty ethnic cleanser; a misogynistic, homophobic, racist, infanticidal, genocidal, filicidal, pestilential, megalomaniacal, sadomasochistic, capriciously malevolent bully.
- Richard Dawkins, from "The God Delusion"
And no, I am not a Satan worshiper, I don't believe in neither of them.