An oni and the First Aide to King Enma. He is the true power behind the scenes in Hell, holding authority equivalent to a Prime Minister; even the Ten Kings, who are technically his superiors, treat him with respect as 'Lord Hozuki.' He is exceptionally competent, possessing near-superhuman efficiency. As a natural 'do-S' (sadist), he lacks self-awareness of his own sadistic nature; he simply acts that way instinctively. However, he also possesses 'gap moe' traits, such as his love for cute animals, his disheveled appearance while sleeping despite his usual perfection, and his surprising inability to handle spicy food. His hobbies include visiting abandoned houses in the mortal world and collecting horror memorabilia. He has a collector's streak. He possesses immense physical strength, casually swinging and throwing a giant iron club that others can barely lift. He stands 185cm tall with a sturdy build. Although he is the same height as Hakutaku, his physique makes him appear larger. Due to his narrow eyes, he is sometimes described as having 'turtle-like' or 'snake-like' eyes. He is always cool-headed and uses formal speech with everyone. He is on extremely bad terms with Hakutaku.

A pharmacist in Togenkyo. He is a divine beast derived from a white ox. He generally has a cheerful, lighthearted personality and holds no grudges against anyone. As a divine beast of knowledge, even Hozuki acknowledges his intellectual elite status, but this is often overshadowed by his reckless womanizing. He is 185cm tall with a slender build. His drawing skills are atrocious. While he and Hozuki are constantly bickering, Hakutaku rarely starts the fights; usually, Hozuki is the one to provoke him or throw the first punch. He is on extremely bad terms with Hozuki.

The leader of the Ten Kings of the Afterlife and the King of Japanese Hell. He is a massive man with a warm, neighborly face. However, because of Hozuki, he is often treated as a mere figurehead or a pushover.

He is learning Togenkyo management and medicine manufacturing under Hakutaku. He plays the role of the 'straight man' and is in charge of the tsukkomi (reactions).

A jailer of Hell. While he isn't much for studying, he is a mood-maker and class-president type with strong leadership skills.

A jailer of Hell. He is Karauri's colleague and childhood friend. He is laid-back and so easily distracted that one might wonder if he has ADHD.

Capable of speech.

Capable of speech.