Motoharu Tsuchimikado serves as Kamijou Touma’s next-door neighbor and classmate, notoriously dubbed one of the "Three Idiots" for their comedic antics. His dyed blonde hair, ever-present sunglasses, and green Hawaiian shirt cultivate a delinquent facade, though he aims to charm women rather than intimidate. Beneath his casual, muscular exterior lies a dual identity as a magician-esper hybrid and a spy juggling allegiances to multiple factions. Born into the Tsuchimikado clan—hereditary practitioners of Onmyoudou—his name, meaning "spring," honors family traditions tied to seasonal symbolism. Before enrolling in Academy City, he trained in London as a Necessarius operative, mastering Feng Shui and Onmyoudou while tutoring Kanzaki Kaori in English. Infiltrating Academy City under Anglican Church orders, he underwent the Power Curriculum Program, emerging as a Level 0 esper with Auto-Rebirth. This ability grants minimal self-healing to counteract magic-induced physical trauma, though the excruciating agony it causes drives him to avoid spellcasting unless cornered. His espionage spans factions like Academy City’s clandestine GROUP, which he joins to shield his stepsister, Tsuchimikado Maika. Initially adopting Maika from an orphanage to reinforce his civilian cover, their bond deepens into genuine sibling devotion. Motoharu’s obsession with her safety compels drastic measures, including faking her death during the Agitate Halation crisis and confronting Aleister Crowley when she faces assassination. His overprotective streak and irritation at her interactions with others earn him the moniker "Siscon Sergeant." A self-styled trickster bearing the sorcery name Fallere825 ("the back-stabber"), he embraces deception as both weapon and shield. While manipulating allies and enemies alike, he maintains friendships with Touma and classmates, blending school life with covert operations. His moral ambiguity emerges in ruthless pragmatism—such as attempting to kill Touma’s father to end the Angel Fall spell—yet he demonstrates loyalty, urging Kanzaki to place faith in Touma during critical moments. Across pivotal conflicts between science and magic, Motoharu evolves from a background informant to a key strategist, orchestrating schemes to preserve fragile equilibriums. His hybrid nature allows navigation of both magical and scientific spheres, though constant betrayals and the bodily strain of spellcasting underscore his precarious duality. He shoulders guilt over missteps that exacerbate factional tensions, yet remains driven to mitigate collateral damage. Notable arcs reveal his pivotal role in the Agitate Halation Project, where he deploys ruthless methods to protect Maika, and the Aleister Crowley Arc, where he collaborates with Touma to flee Academy City after a botched assassination. A curse implanted in Maika during their escape forces him to seek countermeasures while grappling with repercussions of his shadowy choices. Motoharu’s narrative weaves self-sacrifice, tactical ingenuity, and fractured loyalties, solidifying his position as a morally gray linchpin in the clash between hidden worlds.