The Meal is from Portugal, but his mother was mail-ordered from Vietnam sometime after the conflict. His first words were "Bucu bucu."
SuperHiro is - as you should have been able to tell - from Hiroshima, Japan. He doesn't actually speak English, but has one of those nifty translation programs. He doesn't have any fingers either, and his lisp makes it difficult for the voice-recongition software to get everything right. Hence the grammatical errors.
Sepiche, Rincewind, and Faldarian all attend the German School of Evolutionary Thinking (I think they're housemates?). It's located in the basement of Hitler's old palace, which is why they feel somehow connected on a metaphysical level with SuperHiro (too many nights playing Axis & Allies, I guess).
Valael works at the San Diego Zoo, and is the one of the few Yankees posting in this thread. He's Mormon and was granted permission to do his Mission solely by posting on this internet forum. He's been banned from R&P.
Zarathud and Giles are Siamese Twins from Arkansas, and jpiniard is the personality that they share in common (his handle used to be LCD, lowest common denominator, but they caved in and recognized his desire for the dignity of individuality after he stopped speaking to both of them).
Jeff Jones and Kelric enjoyed a brief period of wedded bliss right after Massachusettes recognized gay marriages...it ended after a mishap involving the Clap when they went to consummate. Kelric plays Cricket professionally.
Scanner is an AI construct operating out of CalTech's astrophysics department (The Meal found him wandering over at Console Gold and PM'd him an invitation).
JonathanStrange is actually a synthesis of two literary characters brought to life through the profundity of intellectual flatulence emitted from this site.
Ridah and U2K represent the East and West Sides, respectively. It is rumored that U2K has a direct line to the Overlords themselves, and is always listening to them with one ear, which explains the oftentimes incomprehensibility of his posts. Seriously: who could try and absorb their unknowable brilliance.
For a more detailed analysis, I recommed reading this:
