mk needs a diet!

makes sense not a bad idea but i dont think it would really add to his character in any way

This would add to his character very well. Many of his moves have a sumo feel to them as it is. But a weapon is still in the air if his does become a sumo. He would use two fighting styles sumo and another along with a weapon. He also has a Japanese appeal to him, so sumo wrestling would work well.