Think about peoples feelings towards clones. They would feel very much like a wasted spot that could have had so much potential from their series instead of borrowing from other series. Even then the 'copy' gimmick is given to a character much more known for it-Kirby. They have a lot of games to take stuff from- wii play, wii sports, wii music, wii fit, wii party, wii chess (?), pilotwings, mario kart, wii plaza, mii maker, mii parade, nintendogs+cats, nintendo land, miiverse, super mario sluggers, check mii out, pokemon ranch,brain age, friend collection, and a lot more so they do not have a shortage of games to pull from and have even closer bonds with other franchises as well, but I think they have enough stuff to go off of just their series.