Actually, there have been quite a few Naruto games for PS2 as well as I believe DS. There was also a fighting game with several characters from Jump Comics released for DS that was actually quite similar to Super Smash Brothers in the way that there was a buttload of characters who readily beat...
Micaiah. Now on to bigger and better things.
Honestly, I've thought of this a whole bunch. Not only what I would put in personally, but also what possibilities are there for future Smash Bros. titles. Things I've come up with are the obvious things that we all have thought of, good ol'...