This is what annoys me, People don't explain why these third party characters should be in Super Smash Bros. What Valid reason do they have for being in Super Smash Bros.? Reasons like promoting said Third Party character's Game is valid, but as for reasons like "Because he's awsome!" just doesn't cut it unless the developers agree with the fanbase, which was the exact case for Sonic being in Brawl. If Myiamoto didn't agree with Sonic's inclusion, then I don't think Sonic would of made it into the game.
I was just giving examples of characters that other people want and fit the criteria. I wouldn't mind Megaman or Bomberman playable, but I believe that Rayman is extremely possible. Rayman Legends is a Wii-U exclusive game and Rayman's moves in this and Rayman Origins are PERFECT for a Smash Bros. Game. Ubisoft have been extremely close friends with Nintendo as of late. I think two criticality acclaimed platforming games shows how awesome have can be. There is nothing wrong with one or two third party characters because of this, but SSB4 cannot contain too many characters that have been put in "because it'd be cool".