I agree 100% wholeheartedly with Chuck Norris. :P I don't think any Naruto characters should be in it though, because even though quite a few people love Naruto, the majority of people are very unfamiliar with it, and there is already a Naruto fighting game out. (Or more; I'm not sure...) But other than that stuff, I think Brawl already rocks enough, and doesn't really need anyone else to enhance it. XD
Yeah it would be great if they had Chuck Norris, but if they did and you were Chuck Norris and your friend was a different character every time you hit start it would end right away. That's because Chuck Norris always win.
Hello? They use only Nintendo character. Last time I checked, Chuck Norris was not made by Nintendo. I would say they should at a couple of more pokemon then Lucario, spiked up Mewtwo, and a Pokemon Trainer. They should also maybe put in Meta Ridley. Also Diddy Kong would be cool.