We all remember Michael Cera from his role in the movie "Superbad", where he's on a mission with his best friend played by Jonah Hill, to end their high school chapter with a bang and get "lucky" before college start
At the moment I couldn't imagine him playing any other role than the shy and/or dweeby one and to be honest, I really don't want to.
But maybe when he gets older (as he is still young) more roles will become more suitable for him.