Since we had a chance to get to know sumo, why not make origami sumo?
The point you have to be careful in making paper sumo is that because you have to fold - unfold - refold in many ways and many times, it's a bit hard to keep it neat.
But it's not that hard, and besides there's another fun in making paper sumo: you can make two wrestlers and enjoy a match between the two.
All you have to do is to draw a circle (this becomes the ring) on a sheet of paper, stick it on an empty box (any box like an empty Kleenex box shall do), set the wrestlers inside the ring, and tap the edge/corners of the box with your fingers.
Then the two paper wrestlers begin to move, and when one of them falls or goes out of the ring, the match is over.
Depending on the size, thickness or material of the paper you can make various kinds of wrestlers, so develop the strongest wrestler and enjoy the paper sumo match!