Master Eraqus is a character from Kingdom Hearts: Birth by Sleep. He is a Keyblade master, and he is the master of Terra, Aqua, and Ventus. He is the one that taught the three of them how to wield the Keyblade.
 Journal Entries
 Kingdom Hearts: Birth by Sleep
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.
Though strict on the outside, he is not unkind, and loves his pupils like his own children.