Ernest Frieder

Ernest is assigned by Sophie as the commander of the Tokyo Outlaw Headquarters during the Second Great War. He has the ability to change his body's density to hide or pass through solid objects. Despite being a powerful and renowned Flame Haze for decades, he rarely fights head-on and prefers to deceive and ambush his enemies. He also dislikes being called by his first name. He is bound to Brigid.
(from Wikipedia)