Age:Tough one. Most of the kids at the camp appear to be about ten like Raz, but Dogen seemed younger than that and Bobby seriously looked like he was approaching puberty what with the adam's apple and all that. Somewhere between 10 and 13, let's say.
Appearance and voice:Lanky turquoise kid with a neck of giraffelike proportions, gravity-defying ginger afro, and some really, really nasty teeth, and mismatched red/green eyes. Also blessed with a nasally, lisping voice (Provided by a Doug Giorgis), He's pretty unfortunate in the looks department. His clothing is pretty simple - a pair of old maroon pants, holed and patched at the knees, and a red-and-white sports shirt with a "00" motif on the front (someone has a sense of humor about their surname, it seems) and the sleeves torn off. Also, green-and-yellow sweatbands. And no shoes. Which, considering there are pointy arrowheads lying around that camp, really, really bothers me. Possibly the most blatantly hick character in history without it ever being said that he's a hick.
SERIOUSLY, LOOK AT HIM. HE'S MOST UNFORTUNATELY FACIALLY ARRANGED.
And while you're here, have a listen to his voice.
Personality:Bobby is very much the stereotypical bully. He mostly gets kicks from beating the snot out of those weaker and of a more delicate disposition. He's competitive, hence the leviation race, and deems Raz to be a threat to his percieved awesomeness (so much that he jumps down Raz's throat for absolutely no reason other than an unfounded suspicion that Raz deemed himself better than him). There's a bit more to him than is seen in the game, too - in the Camper's Myspaces (which are apparently totally canon, having being written by Tim Schafer during a writer's block), he comes off as significantly smarter than he does in the game, and occasionally alternates between being very formal and dignified, and the expected obnoxiousness. Underneath, he's probably insecure and miserable, with - up until befriending Chloe anyway - only one friend, and he's a Randallesque yes-man who more fufills a lackey role than anything else.
Other things learned from Myspace:He's a fan of horror movies, classic heavy metal bands, and Jackass. Claims not to read any books. Originates in Drywell, Missouri.
Psychic abilities known:All that's been seen in the game is Telekinesis and Levitation, but he probably has more. Notably, he's never seen using his powers on his victims, preferring to use brute force instead. (which now I think about it is surprisingly sportsmanlike of him... of course, I could be wrong and he could be using them offscreen to lay the smackdown on fellow campers for all we know. Also, it could just be a show of power in that he doesn't need psychic powers to beat people up.)
Role in the game:Mostly a minor antagonist and rival figure to Raz, Bobby is mostly seen insulting/shoving Raz around, terrorising Maloof (up until Mikhail comes along), trying to get one over on Raz, tormenting fish with Benny, and, in one scene and nearer the end of the game, hanging out with Chloe. Bobby pretty obviously has a crush on her, even moreso on Myspace where she's got him totally whipped.
(I will so fix this later so it is better. I swear. :O)
Disclaimer: I don't own Psychonauts or any characters from that game, Doublefine does. Don't sue me, I am poor.