Aqua

Aqua is one of the main protagonists of Kingdom Hearts Birth by Sleep and Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-. She is a Keyblade Wielder, similar to Sora. Like Terra and Ventus, it's her dream to become a Keyblade Master, a dream she was able to accomplish out of the three. Aqua is a pupil to master Eraqus, similar to Terra and Ven. She is a selfless person, worrying about others more than herself, and cares deeply for her friends, doing her best to protect them and keep them out of trouble. Aqua even makes good luck charms for them, along with herself, which allows them to feel connected.

Her name is Latin for "water". The official Japanese website refers to Aqua as the "Dancing Waters Forming Bonds" (絆繋ぐ舞水, Kizuna Tsunagu Busui?).