Ace is a secret government agent from an undisclosed nation who has the special ability to learn the techniques of his opponent after gathering battle data. He is asked by the Prime Minister of his country to gather information of a secret weapon being developed in an underground base.
Ace starts off with only his command moves, throw and Surprise Blow. He can obtain more moves by purchasing them at the store in in Character Edit Mode. Passing challenges with Ace gives him access to more moves he can buy. He can buy all the available moves but is only allowed to be assigned seven total special moves and super combos and one meteocombo in his movelist. Also special moves with the same input can't be used at the same time.