During their special E3 direct, Nintendo announced that in Super Smash Bros. For Wii U and 3DS, you can craft your own characters. You can put yourself, or even celebrities, into the game. Using Miis.
The way it works is that you import your Mii and choose a specialisation for them -- either gunner, swordfighter, or brawler -- then you pick what kinds of special attacks they will use on the battlefield. Different types of Mii fighters can use different attacks -- of which there are 36.