Aqua (Japanese: アクア, Hepburn: Akua) is a character from Square Enix's video game franchise Kingdom Hearts. First making cameo appearances in Kingdom Hearts II and its updated version Final Mix, she is introduced in the prequel Kingdom Hearts Birth by Sleep alongside her friends Terra and Ventus. The three are Keyblade apprentices training under Keyblade Master Eraqus, and are the playable protagonists. As the only one among her friends to obtain the rank of Keyblade Master, Aqua is assigned to m…