I've been role playing for almost five years now, so I'd like to think I'm rather proficient in the matter. Don't take my word for it, though. I am a bit biased.
My writing style changes constantly. One moment I'll be a proper British nobleman, the next I'll be engrossed in a stream-of-consciousness panic. Then, I'll slip into a bit of choppy psychopath. You never really know where you'll end up with me.
I adore plot twists and secrecy. Most my characters are pretty detailed, but I never reveal more than a name and face in a character sheet. It's not fair to let you know what pisses my character off or why they act a certain way. You have to find out for yourself.
My characters typically have a tragic backstory and more flaws than strengths. Likable sociopaths are a challenge to pull off--but they're really rewarding and a favorite of mine. I enjoy playing serial killers and deranged science experiments. Villains. Screw all this heroic shit.