Demon Lord Asmodai serves as the buddy monster to Tetsuya Kurodake, originating from the Magic World within the 72 Pillars attribute. His striking appearance features pink skin, silver eyes, pointed ears, shoulder and bicep horns, gray claws, and a long tail. Purple markings adorn his body, including a prominent skull pattern on his head and face, complemented by dark purple hair extending from the scalp marking. He typically wears an open yellow hoodie with orange accents, unzipped teal jeans, violet chaps displaying skull decals, and spiked violet sandals with silver greaves. Silver jewelry accents his look, including hoop earrings, a chain necklace, bracelets, and rings. His Armorknight form adds leg and shoulder armor plating, blasters, a bandoleer of bullets, and a large emotive-faced hammer. As Second Omni Demon Lord, he dons a longer green hoodie with two horns above it and blade-shaped arm decorations. Asmodai functions as both a popular Earth entertainer with his own dancing shows and a knowledgeable figure on Buddyfight mechanics and multiple worlds. His personality blends trickster tendencies with genuine mentorship; he frequently employs shape-shifting, cloning, and riddles to teach lessons or provide guidance, testing others' perceptions. Despite a carefree exterior, he demonstrates deep loyalty, particularly toward Tetsuya, supporting him with strategic advice during critical fights. He states that demons considered "bad" are those deeply bonded with humans, implying his own strong friendship with Tetsuya qualifies him. However, his secretive nature and habitual dishonesty occasionally lead to misunderstandings, even when acting with good intentions. His origins trace back before human history, aligning him with other primordial beings known as the Omni Lords, a status initially concealed. During season 1, he aided Kiri Hyoryu by shape-shifting into a Danger World monster for a buddyfight against Gao Mikado, advising Kiri on tactical versatility. He later participated in cross-world discussions about emerging threats. In season 2 (Future Card Buddyfight Hundred), his identity as the Second Omni Lord was formally revealed. He joined other Omni Lords to confront the planet-consuming entity Yamigedo. When the antagonist Ikazuchi targeted Omni Lord Tenbu, Asmodai intervened directly, wielding an orb-like Core Gadget characteristic of Omni Lords. This confrontation culminated in a recorded loss against Ikazuchi. Earlier that season, during an investigation into mysterious assailants, a figure in a conical hat identified him as the Second Omni Lord and pressed him with evidence, leading to accusations about his status. Asmodai’s abilities extend beyond standard combat, incorporating shape-shifting for espionage or multitasking and cloning for performance or tactical misdirection. His card effect "Dangerous Back-drop!" allows him to destroy an opponent’s monster upon entering the field by discarding a card, reflecting his disruptive demonic nature.