Chidaruma rules Hell and the Magic-Users Realm as the most powerful Devil in his universe. His appearance features a skeletal head with prominent eye sockets, sharp teeth, and curly horns protruding from both sides, often accompanied by a long tongue extending past his teeth. His heavily muscled build matches other Devils, and he possesses large wings. He typically wears a blue hoodie and spiked arm guards with chains, but no pants. His size and appearance have changed over centuries. He exhibits a dual nature. To combat eternal boredom, he engages in frivolous or malicious pranks like harassing Magic Users, interfering with En's mushrooms, or disturbing fellow Devils. He frequently sleeps despite no biological need, even modifying his body by removing horns and tongue for comfort. Conversely, he displays merciless brutality when annoyed, such as revoking Asu's Devil status for withholding secrets or indiscriminately trampling deceased Magic Users. He demonstrates intense focus and intelligence, dedicating centuries to mastering diverse pursuits—from entrepreneurial ventures to painting or poetry—before abandoning them upon losing interest. As the first life form in his dimension, he wielded omnipotent and omniscient power. After creating Hell, he endured millennia of solitude before fashioning Magic Users from mud, gradually refining them into human-like forms and elevating cooperative individuals to Devil status. He established the Magic-Users Realm to segregate sorcerers' afterlife. Disillusioned by creating beings he could only manipulate, he grew depressed. Discovering the human dimension fascinated him with life forms independent of his influence. He kidnapped humans for centuries, subjecting them to experiments, companionship, or consumption, though boredom eventually led him to depart. Upon revisiting the human realm, Chidaruma encountered a mountain of corpses—humans slaughtered by feral Magic Users who nearly caused human extinction. This site transformed into a toxic, non-decomposing refuse lake dubbed "Hole." Captivated by its grotesque nature, he documented it through art and poetry. He sensed the emergence within Hole of a vengeful entity composed of human spirits dedicated to eradicating Magic Users, and awaited an encounter with this potential equal. He wields comprehensive reality-altering abilities, including death manipulation, existence erasure, soul control, time manipulation, and law alteration across dimensions. He created all magic systems, granting him mastery over every form like metamorphosis, explosions, curses, and time-based magic. His durability and power operate at a multi-universal scale, having forged realms like Hell and the Magic-Users Realm alongside their interconnected timelines. He exists outside conventional life and death cycles, rendering him immortal and immune to temporal paradoxes. While typically unarmed, he occasionally employs Store's Kitchen Knife, a weapon capable of negating durability, even against lesser Devils. He tends to multitask, owns mundane objects like a Nintendo Switch, and serves as the universe's closest entity to a deity.