Much as it would be amusing if he hit people with a (presumably dead?) samurai I presume you mean a samurai sword (katana?). If you want to keep it as just a samurai though thats fine, its more fun, lol.

Seems good though, the tree of life will do its job but probably not in quite the way you were thinking of. The seeing through solid objects is perhaps a little strong, but if you wanted to have something like it cant see through metal, requires great concentration to use OR can only see movement rather than detail then that would be perfectly fine, or if youve got any other ideas thats fine, but permenant x-ray vision would make it hard for anything to be a surprise.