Robin is the slightly power-mad, perfectionist leader of the group whose main complaint is that the other Titans just won't do what he says.
Beast Boy is Cyborg's best bud--a slightly dim but loveable loafer who transforms into all sorts of animals when he's not eating burritos and watching TV.
Cyborg is a laid-back, half-teen, half-robot who's more interested in pizza and video games than in fighting crime
Starfire is an alien struggling to fit in and learn the ways of Earth while driving Robin insane with unrequited puppy love.
Raven is the sarcastic, deadpan demon girl who'd rather be left alone.