Well if we're judging by temperature I know that there are a good number of Scandinavian TFPers so I'm guessing that one of them would probably be the winner.
By personality (not in any order)... Bones, WhoaitsZ, uncle phil, meanSpleen, Shokan, Spinach_Indeed, Sticky, crackpot, sadistikdreams, GakFace, ogre840, MrFlux, YourNeverThere, Jadey, Diablo, TerresqueÜ (he has his moments
), flyman, Giant Hamburger, wrkime, degrawj, NuKE, juanvaldes, cheers... TOO MANY!!!! MIND OVERLOAD!!!!!!
EDIT: Forgot World's King and air45. Silly me.