I'm surprised no one else mentioned this.
-The Brilliant Addict
The guy is basically a genius at whatever he does, and his good looks and ability to impress others ensures that he's well employed, admired, and respected. This man seems to have it all, right?
Wrong.
Beneath this intelligent and charming exterior is a desperate man with no self-control. He's an alcoholic, a drug user, an over eater, an obsessive gambler...if it offers immediate gratification, then he's hooked immediately.
He's probably squandered millions of gold, ruined dozens of marriages, and nearly destroyed his own life a hundred times...but he somehow manages to keep going.
He's probably got a best friend and several ladies that can't help but stick around and bail him out when he gets in trouble.
Tips: You have everything going for you...except that you can't control your addictions. So long as you have your fix, you're a genius that everyone loves. The minute that starts to fade, everything falls apart and you become a slave your lack of willpower.
Here is another concept that springs to mind.
-The Lunatic
Brilliant, forceful, COMMANDING...but thoroughly insane. He suffers from any number of minor and major neurosis and psychosis...and if he weren't so darn intelligent and persuasive, he'd have been locked up years ago.
This could border from the brilliant and good natured "Rain Man" autist to the downright paranoid and delusional Hitler/Stalin.
Tips: You aren't insane...everyone else is. Why are they staring at you? Get back to work! Yes...that's better. Better keep moving...else the bugs will come. There are no bugs...YES THERE ARE! SHUT UP! Hey! STOP STARING!