It's all MiFare, you could in theory copy the data from one figure into another. Or something silly like a train pass.

AFAIK, the figures only store two pieces of data: the character's name and experience. The game figures out the rest when it's loaded. So as long as someone has all the in-game models, something like this would be very feasible.

A Disney Infinity-esque game with nintendo characters would be pretty cool :3