Rune(ルーン) is one of the Gravity Children and the second in command of Tool Toul To and the oldest member of the team. He contains various robotic parts and keeps weapons on him at all times. He also values the regalia highly, shown when he said he would of cut off Isawa's arm and retrieve the Regalia by force when she was going to throw the new Wind Regalia. Rune at some point possessed his own Regalia, but it's current status and whereabouts are unknown.

Community content is available under CC-BY-SA unless otherwise noted.