Big body build around 2 meters, strong arms, wear animal skins or armors (demonic beasts' skulls as helmets).
Mad demons form the main force of demon army. Apart from fighting in battle they guard towers, patrol and scout.
The first contact with mad demons since the end of Second Battle of Divine Will happened when two demons attacked Witch Cooperation Association members in Barbarian Lands beyond Impassable Mountain Range. They killed dozen of witches before they were defeated by Cara and Leaf.