I think he would make a great addition to the game. Granted he is from a turn-based RPG but he definitely has enough animations to add him into the game. One of the alternates could be Frog/Glenn, Magus, Marle, Lucca etc. If you need an NES version, some chinese company made an NES version of the game. It would be pretty funny to see that version of Chrono in the game.