In previous Heroes spoilers, we posted the fact that a new character named Joy was coming to the show in season three.
Now, Kristin from E! has come out with more information on this Joy:
Look for a new villain named Joy. Her power is superspeed—she's lightning-fast, like the Flash. Hiro meets her in a museum. He asks her if she has powers and if she is trying to steal some art.
She convinces him she's on the up-and-up...and then makes off with a bunch of paintings. She's described as a nymph-like character with the speed of a cheetah on, er, speed.