Asmodai is a demon from Magic World partnering with human Tetsuya Kurodake as his buddy monster. He displays distinctive pink skin, silver eyes, and purple markings, featuring horns on his shoulders and biceps plus a long tail. His typical outfit consists of an unzipped yellow hoodie, teal jeans, and violet chaps adorned with spiked belts and skull decals. During significant transformations, he adopts armored forms: Armorknight Asmodai gains plating, blasters, and a large hammer, while his Second Omni Demon Lord appearance features a longer green hoodie with blade-like arm decorations. His personality marries trickster tendencies with underlying loyalty. He often uses shape-shifting and cloning abilities for pranks, multitasking, or espionage. Despite this mischievous demeanor, he demonstrates genuine care for Tetsuya, offering strategic advice during buddyfights and encouraging perseverance. His guidance proves pivotal in Tetsuya’s victories against opponents like Sofia Sakharov. However, secretive behavior and habitual dishonesty occasionally strain relationships, even with benevolent intentions. As an Omni Lord—a guardian entity protecting Earth from existential threats—he possesses extensive knowledge of interdimensional worlds and buddyfighting mechanics, often conveying insights through riddles or humor. His background reveals deeper significance as the Second Omni Demon Lord within the Omni Lords coalition. This role involves monitoring multiversal stability, exemplified by participation in cross-world conferences addressing anomalies like Yamigedo’s incursions. During Season 2, he confronts the Hundred Demons faction member Ikazuchi using a Core Gadget, resulting in defeat. References place his existence before recorded human history, though his historical context remains partially obscured. In narrative arcs, he aids allies beyond Tetsuya. He temporarily serves as Kiri Hyoryu’s buddy monster under disguise, advising diversifying combat strategies beyond single-world tactics. During the GGG Cup tournament (All-Star Fight arc), he participates alongside other notable fighters and monsters. His enduring bond with Tetsuya remains central, affirmed by declaring himself "as bad as it gets" among demons who deeply befriend humans.