Deuce is Class Zero's flutist, playing support melodies from behind the two attacking Cadets. She may have a crush on Ace, evidenced by her want to play in a duet with him singing, however, this has yet to happen. It's just strange.

While Deuce plays the flute in-game, the actress who is cast doesn't have to play the flute. If the voice actress, who is casted for the role of Deuce, wants to play the flute as for the character, I'll listen to your playing. However, if you are going to send a sample in, I'd like to know you can absolutely play. If the voice actress, who is casted for the role of Deuce, does not want to do the flute part and/or cannot play the flute, the game's audio shall be used instead. It's a matter of choice, on behalf of the actress.