My first try on character design. (be gentle)
So I thought about magic in this characters world as a deal, the wizard trades his flesh and his body which are then sealed in another dimension. Only a little part of him, the head and arms, can reach through the gate between the dimensions and cast magic in the "real" world. So the wizard is trapped inside the magic dimension but can see and react inside the real world, which he can manipulate that way. The geat (the star) is seated on the shoulders of a non existant dummy-body (the cloak) which can move the geat (and the wizard) through the real world.