Suguru Geto, born February 3, 1990, attended Tokyo Jujutsu High alongside classmates Satoru Gojo and Shoko Ieiri. During their second year, he and Gojo were tasked with escorting the Star Plasma Vessel, Riko Amanai, for her merger with Tengen. The mission ended in trauma when mercenary Toji Fushiguro killed Riko before their eyes and defeated them both. Though Gojo later revived and killed Toji, the celebratory reaction of Riko's followers to her death deeply affected Geto. Over the next year, witnessing Gojo ascend to become "the strongest" sorcerer while undertaking solitary missions led Geto to question protecting non-sorcerers, whom he increasingly despised. A conversation with special-grade sorcerer Yuki Tsukumo, who theorized ending cursed spirits required eliminating cursed energy or teaching all humans jujutsu, prompted Geto to propose a third solution: exterminating non-sorcerers. Yuki urged him to act according to his true feelings. The death of his junior, Yu Haibara, on a mission intensified Geto's disillusionment; he likened a sorcerer's life to a marathon ending at a mountain of corpses. This culminated during a mission to a village where non-sorcerers imprisoned two young sorcerer girls, Nanako and Mimiko Hasaba, blaming them for curse incidents. After exorcising the curses, Geto massacred all 112 villagers, rescued the girls, and abandoned Jujutsu High. He later killed his non-sorcerer parents to avoid partiality, solidifying his identity as a curse user. Adopting a Buddhist priest guise, Geto formed the Time Vessel Association to recruit followers and amass curses. He openly despised non-sorcerers as "monkeys," believing sorcerers represented humanity's evolved future. His goal was a world solely for jujutsu practitioners, free from curses. In December 2017, he initiated the Night Parade of a Hundred Demons, releasing thousands of curses across Kyoto and Shinjuku. He attacked Tokyo Jujutsu High to capture Yuta Okkotsu's special-grade cursed spirit, Rika Orimoto, deeming her power essential. During the assault, he noted the young sorcerers' solidarity but was ultimately defeated by Yuta. Confronted by Gojo in his final moments, Geto admitted he could never find happiness in the current world but expressed no hatred for his former comrades. He asked Gojo to curse him at the end. Gojo executed him shortly after. Geto's corpse was later possessed by the ancient sorcerer Kenjaku, who used Geto's Cursed Spirit Manipulation technique for his own goals. Kenjaku exploited Geto's residual influence to manipulate followers believing he would fulfill Geto's vision. Geto's abilities centered on Cursed Spirit Manipulation: absorbing defeated curses as black orbs and ingesting them—a process likened to consuming "vomit-covered rags"—to gain control. He commanded thousands of curses, deploying them strategically. He was also a formidable hand-to-hand combatant, using opponents' assumptions about his reliance on curses to his advantage. Classified as a special-grade sorcerer, he never demonstrated a domain expansion. His relationship with Gojo evolved from a close friendship and rivalry—when they were deemed "the strongest" duo—to ideological opposition. While Gojo maintained sorcerers should protect the weak, Geto viewed non-sorcerers as inherently inferior and dangerous. Despite their rift, a complex mutual respect persisted, underscored by Geto's final words. Geto cared deeply for fellow curse users, calling them "family," and showed genuine affection for Nanako and Mimiko, whom he rescued and raised. His charisma inspired loyalty among followers, though his politeness toward jujutsu sorcerers often masked manipulation, as seen in his feigned friendship with Yuta Okkotsu. A director of the anime adaptation interpreted Geto's descent as the result of cumulative systemic pressures within the jujutsu world, describing his actions as the culmination of a "mountain of stress" that shattered his resolve.