He is shown as a muscular man with long red hair and full-body tattoos. Johanna, Jaster's mom, was a direct descendant of the Star King, which makes Jaster a descendant as well. Jaster uses the Star King's power four times, in the battles against Beast Seed, Johanna, Mother and the Demon Battleship. Using the power gives Jaster a red aura, along with the Star King's tattoos, dark red hair and enormous strength. The Star King knew Ilzarbella before she became the "Mother of all Rune" and, as shown with Jaster, he is also able to "possess" the body of his descendants.