These geniuses are neurotic, obnoxious, arrogant, lecherous, dysfunctional, blunt, deathly sarcastic. They're also often a bit outside the central casting beauty standard, physically, in some cases extremely so...It's where they feel safe to cast personalities instead of faces, since there's no pretty clause...Of course, they're always going to be my favourite characters...
Alas, in this illustrious group, Charlie1 is by far the least appealing to me. Sorry, Charles, you're just not weird enough. It's really not enough that your hair is so very curly and your eyes so very mournful and your voice so very bedroom. I'm choosing Dr Data2 over you! Or, by choosing, I mean that Dr Data is closer to the top of the genius pyramid. (The apex of such a pyramid, in this and all other universes, is Rodney McKay.3 He's being held up by a lecherous, dashingly handsome dwarf4 and a triple-PhD FBI agent right now.5 While the demented, tormented Cylon collaborator6 looks on and giggles hysterically.)
1. Mathematician Charles Eppes (David Krumholtz), NUMB3RS
2. Dr. Nigel Fenway (Brent Spiner), Threshold
3. Astrophysicist played by David Hewlett, Stargate: Atlantis—see icon
4. Mathematician/linguist Arthur Ramsey (Peter Dinklage), Threshold
5. no idea
6. Evil(?) genius Gaius Baltar (James Callis), Battlestar Galactica