I currently play my kobold sorcerer pretty much to a T, the way Xarlen described.
Sneaky, crafty, always using others for his own ends, Kaz is first a survivalist, and second an idealist. Delusions of grandeur run strong in this one, who never felt that being put down was his true calling in life, no matter what the bigger, stronger berks said. He's tough, he's bitter, and he's not above fleeing from a combat where nearly everyone is unconcious because HE's not about to be the last one standing when the chips are down.
Cowardly? Maybe. But he's got the power to come back prepared and kick your butt later, if he's so inclined.
He's working towards a PrC from these boards, that'll let him transform in to a dragon, finally realizing his goal of inheriting the dragon's powers, and then, he'll go from avoiding getting his ass kicked to trying to carve out his own syndicate of the downtrodden (with himself as the undisputed ruler, of course.

).
Unfortunately, the DM doesn't like him so much, mostly because he ran away from a combat where there was only one person left standing (which seems iffy to me, BID).
From a biological standpoint -- the critter is reptilian: still until the strike. It's family is very not warm or cuddly -- you don't get the strong bond with mothers, though you are watched and protected. Life is hard, after you escape being eaten by your peers.
So now I'm at a new character junction, so I'll probably play a human
dragoon, stoic and silent, a still water running deep.
Certainly, I thirst for Savage Species, being a BIG fan of monstrous PC's.
....and the 'human in a funny costume' thing isn't really a big problem. Because that's mostly what other races ACTUALLY ARE. They're not alien in the true sense of the word, they're alien in the Star Trek sense of the word, with a funy-looking forehead and a different culture. And, honestly, culture is what it is all about -- explain the culture in functional terms, and you've got a framework to fly from.