Master Eraqus

Master Eraqus is the one of the true Keyblade Masters and also Terra, Aqua, and Ventus's teacher. He has a strong aversion to darkness, and believes it the duty of every Keyblade Master to rid the world of it. Eraqus disagreed with Master Xehanort's hypotheses, which threatened the worlds, and attempted to fight Master Xehanort over it. However, his attempt was futile, as Master Xehanort quickly took him down with the use of his dark powers, which left Eraqus scarred.