An X-Man of Japanese origin, he'd bring a decent slice of Oriental cool to the proceedings. His hot-headed nature meant he wasn't ideally suited to being a part of Xavier's team, and he created much drama during his limited tenure.
Could He Hold His Own Against Magneto?
He may not be a team player, but as he comes packing such a cool power, you'd definitely want him on your side. He can basically create and release red-hot plasma, which would look hella cool if he and Magneto went head-to-head for a metal/magma slinging match. Imagine the visuals…
Concerned about the devastating side effects of the Hiroshima atom bomb, Professor X heads to Japan to investigate the fallout, meeting the young Shiro Yoshida in the process.