Kokuton Shuu is part of Kouen Ren's Household Members.

Kokuton has a bull-like appearance, lion-like hair, a tail and his entire body is covered in fur. He has a horn on either side of the head. He wears Kou's traditional clothing and has a shoulder protector on his right shoulder. He has Kou's emblem in the chest of his armor.

(Source: Magi Wiki)