With around 26 characters to choose from, Mewtwo will always be the most unique imo. Lets just say that Mewtwo is just a mystique opponent. He drifts in the air slowly, can teleport rather large distances and his attacks could prove deadly if mastered. Mewtwo is made to play mind games with his opponents because of his unpredictability, therefore he possibly has the potential to compete in casual competitive games and could be considered as a great threat. If there is one thing Mewtwo could greatly improve on, it'd be his strength which unfortunately is very low in this installment. If Nintendo were to bring back a character in SSBM that didn't appear in Brawl, lets hope that it'd be Mewtwo because of his widely different game play style from the rest.