Kingdom Hearts II
Before her introduction as a main character in "Kingdom Hearts Birth by Sleep", Aqua made small appearances in the secret endings from "Kingdom Hearts II" and its re-release, "Kingdom Hearts II Final Mix", both events depicting Aqua, Terra, and Ventus confronting Xehanort at the Keyblade Graveyard. "Kingdom Hearts II Final Mix" also contains an additional cutscene showing Aqua's Keyblade and armor to be stored in the "Chamber of Repose", a hidden room in Hollow Bastion that is frequented by Xemnas.