Sinbad

Sinbad (シンドバッド, Shindobaddo) also known as the King of Sidria (also recognize as Conquer of the Seven Seas) is a legendary sailor, and is known to have founded the kingdom of Sidria, after conquering the seven Dungeons and one Alpha Cell. When Sinbad applied to be a teaher at Tatakai Academy, he was soon reached the rank of Kage as the Umikage (海影, Umikage, Literal Meaning: "Sea Shadow")