G/Bz, easily. The creepy way he inquired after folks' sex lives, plus the LIES LIES LIES, made my skin crawl.
Synbios I haven't really followed, but he seems a more insidious type of creepy. Calling him "insidious" is probably giving him a boner as we speak -- a boner he will be unable to satisfy. Cursed flippers!
fart on GAF has gotten really really angry, which distresses me because I used to really like his posts. Now he just comes across as a big ol' knot of loathing, as though he seriously hardcore resents a world that rewards people he considers stupider than him. Get used to it, bucko. He's not so much creepy as he is impossible to chat with.
aoi tsuki kinda creeps me out, because he clearly needs acknowledgment of his chronic satyriasis to validate himself. Ew!
warcock creeps me out, because he's too sexy and too terrorist AT THE SAME TIME.
demi creeps me out because he has over 40K gamer points. also i am jealous.
i used to find foc creepy back when he was a desperate virgin; now, he's just plain ol' fall-off-the-truck stupid.
I don't find you creepy, Mups. You're just needy, but you probably already knew that.