Terra

Terra (テラ, Tera) is one of the three playable characters of Birth by Sleep. He is a Keyblade wielder who is trained by Master Eraqus alongside Aqua and Ventus, developing a strong sibling-like bond and sharing his dream of becoming a Keyblade Master with them;[23] gameplay-wise, he performs slower, heavier-hitting attacks than Aqua and Ventus. During an exam to obtain the Mark of Mastery, Master Xehanort manipulates the trials to stimulate the darkness that resides inside of Terra, for which he is denied the rank.[24] He is thus easily manipulated by Xehanort's encouragements to channel his darkness into power,[25] and becomes Xehanort's first vessel. Terra is ultimately freed from Xehanort's control and restored to normal during the events of Kingdom Hearts III.