In the beginning of KH2, you ARE Roxas. You play as him for a while before Sora finally awakens and then you don't get to play as him again. There could be a cheat for it, though... Try a website I...
u play as roxas in the beginning of kingdom hearts 2 but then he dissapears so u have 2 play as sora from then on
you can, but only for the opening part of the game
you can't play a s Roxas.