Chapeau-jii

シャポ爺

An ancient demon taking the form of a hat, he possesses extensive knowledge regarding all matters concerning the underworld and demons. In the OVA, he is frequently asleep due to his advanced age and resides primarily within Enma's head. Although he seldom takes direct action, he advises Enma on the optimal course of action and alerts him to the presence of demons. In the manga, he is younger, capable of changing his shape and appearance, possesses a more aggressive personality, and plays a more active role. He also has a habit of using the sentence-ending copula "jaja".