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Jon Ace is a major character from Monsuno: World Master and its sequel series, Monsuno: Combat Chaos.
He was previously one of the S.T.O.R.M. commanders until he decided to leave S.T.O.R.M. after helping Team Core-Tech defeat the Darkspin mercenary group. But after the Hand of Destiny was defeated and the world was saved, he returned to S.T.O.R.M. to serve as the new Commandant Marshall.
Jon Ace is voiced by Christopher Corey Smith, who also voiced Bren in the same series, Kittan Bachika in Gurren Lagann, Spandam in One Piece, and the Joker in the Lego Batman video games.