Castellan was a machine that looked much like an elderly king. He wore a dark-colored robe, trimmed with fur with the symbol of Granbell Kingdom emblazoned on the back. As well as a multi-color, stripped crown on his head. He had a thick mustache and beard and gear-like decorations around both of his eyes. When entering into battle, Castellan discarded his robe revealing a robotic-body similar to a medieval knight's armor.