Minamoto Teru presides as student council president at Kamome Academy High School and stands as the eldest son of the famed Minamoto exorcist clan, with siblings Kou and Tiara. Tall and slim, Teru possesses blond hair slightly spikier and longer at the neck than Kou's, complemented by blue eyes. His widely acknowledged handsomeness fuels significant popularity and a "school prince" image. He consistently wears a long-sleeved cream blouse instead of the standard blue short-sleeved uniform, a red-and-white student council armband on his left arm, and often carries a black clipboard. Exorcist tools are always present: a red-and-yellow bracelet on his right wrist and a sword sheathed at his hip or back. He sometimes dons traditional attire during exorcisms and casual, unbuttoned shirts over T-shirts on his days off. Teru projects a calm, collected, and reliable public persona, earning widespread admiration for his perceived kindness to everyone. He accepts compliments humbly without conceit. Privately, he exhibits sadistic and harsh tendencies, frequently punishing Vice President Akane Aoi for mistakes. He rigidly believes all supernaturals are inherently evil and dangerous, save the Mokke due to Tiara's affection. His exorcism methods involve rendering targets helpless before elimination, viewed by others as cruel. Teru harbors a long-standing, unspecified crush, having declined confessions citing this reason. He is intensely protective of his siblings but struggles with Kou's growing independence, lamenting that Kou no longer relies on him as in childhood. In the "New Present" alternate timeline altered by the Clock Keepers, Teru retains his original memories while existing in this changed reality. He is engaged to Aoi Akane through a family arrangement, though both express mutual reluctance. Still student council president and active in exorcism, he lacks memories predating the timeline shift. His personality mirrors the original, including supernatural disdain, but he employs manipulative tactics—like fabricating a relationship between Akane and Nene to secure their cooperation in restoring the original timeline. His memory retention ability suppresses the new timeline's memories for three-day periods. During these windows, he confronts Akane about the altered world and experiences cognitive dissonance upon learning his deceased mother is alive here. As the Minamoto clan heir, Teru wields high spiritual power, demonstrated from age eight by solo exorcism of large supernaturals using a sword and spirit lightning. His katana generates unique black lightning, differing from Kou and Tiara's white, damaging souls internally and projecting over distances—a power that severely harmed Hanako. He creates inescapable lightning cages to contain entities like Hanako's hakujoudai. His bracelet functions as a versatile tool, extending or shrinking to restrain targets, often used on Akane and occasionally Kou. Additional abilities include enchanting objects (like Akane's spirit-suppressing glasses), salt-based purifications, and physical prowess such as rooftop jumps and overpowering opponents. He cannot cook or perform household chores without causing disasters like toxic substances or fires. Teru underwent rigorous exorcist training from childhood, shouldering responsibilities early. He discouraged Kou from exorcism to protect his brother's childhood, inadvertently making Kou feel underestimated. Teru conducts nightly exorcism rounds at Kamome Academy, limiting his rest. Academically, he excels, ranking first among peers with no weak subjects; his English proficiency earned exam bonus points. His favorite snack is sweet potatoes, and he peels oranges by hand. A pilot version assigned him the surname "Adashino". Key story involvements include confronting Hanako on the school rooftop, trapping him in a lightning cage and fighting until Kou intervened. During the "Mokke of the Dead" arc, he led efforts against a zombie outbreak, utilizing salt purification with Nene's assistance. He encountered Mitsuba in the "Melancholy of the New No.3" arc, attempting exorcism until Natsuhiko's interference caused a distraction. In the New Present timeline, he collaborated with Akane and Nene to reverse the altered reality after confirming its artificial nature.