Hmmm... Certain fan versions of Naruto are just about warped enough for a Reality Marble (particularly those that spend a fair bit of time going into the psychological implications of his massive overuse of Kage Bunshin). "My body is made of Clones."
Actually, if you really wanted to warp things a bit, you could get some mileage out of the idea of Reality Marbles and the fact that all of the really powerful ninja are crazy in some way.
...and then I'm imagining how much the Mage's Association would flip out to discover a previously unknown section of the world, filled with people who considered "deploy Reality Marble" to just be the thing you did at the start of every fight. Mind you I don't know what that would be a crossover with - Yu-gi-oh, maybe?
Actually, if you really wanted to warp things a bit, you could get some mileage out of the idea of Reality Marbles and the fact that all of the really powerful ninja are crazy in some way.
...and then I'm imagining how much the Mage's Association would flip out to discover a previously unknown section of the world, filled with people who considered "deploy Reality Marble" to just be the thing you did at the start of every fight. Mind you I don't know what that would be a crossover with - Yu-gi-oh, maybe?