Musketeer X (銃士Ｘ(マスケティア・イクス), Jūshi Ekusu(Masuketia Ikusu)?) is a player in the VRMMO game, «Gun Gale Online», and a participant in the 3rd Bullet of Bullets. She is one of the four players in the finals of the tournament who had not participated in the finals of the previous two tournaments.