Only uses I can think of is having an actually finite currency - as blockchain was conceived to solve the problem of digital currency double-spending - or of complete unfungibility - in creating unique items that can’t be double-spent either, so they’re truly singular. For that last one, it could be something like your character too, which could make federated MMOs a fair amount easier to create.

Either way, can’t appear to understand where the value could lie in games without extremely sophisticated social dynamics that stretch a very long time.