Ayato Yuri is the photography club vice-president in his second year at Morimori Academy. His transient childhood stemmed from neglect; his promiscuous mother frequently changed jobs and homes, forcing multiple school transfers. Left unsupervised young, he often sneaked into clubs and sports practices to combat boredom, honing sharp observational skills and an unconventional charm. He befriended Yui Tamura in elementary school, inviting the isolated boy home during rain. They reunited in middle school after Yuri relocated in sixth grade, maintaining a close bond into high school. He possesses pale skin, unkempt medium-length pink hair, and pink eyes, usually hidden behind sunglasses. Multiple piercings adorn his ears, tongue, and navel, paired with habitual chokers, necklaces, bracelets, and rings. Standing 179 cm tall and weighing 69 kg with a slim build, he often appears barefoot in his school uniform topped with a pink sweater. His nails are painted black. His personality is flamboyant and chaotic, featuring unpredictable speech patterns, random laughter, and shifting pitches that hinder coherent conversation. He intensely avoids boredom, often equating it with non-sexual situations, and exhibits high intelligence beneath his eccentricity. His character centers explicitly on sexual activities; his hobbies, skills, and self-professed specialties revolve around sex, blowjobs, BDSM, and toy use. Identifying as bisexual and versatile, he frequently voices desires like "Dicks! Dicks! Dicks!" or "I WANT KISSY". This manifests in habitual licking or sucking, with noted soft spots like the inner thigh. Key relationships define him. His lifelong friendship with Yui Tamura contrasts sharply with newer dynamics like Tōru Fujisaki's obsessive fixation, sparked after Yuri saved him from suicide; Fujisaki later observes Yuri's habit of leaving his room unlocked. Within the club, he engages sexually with members, though deeper emotional connections remain largely unexplored. His family background lacks paternal figures; his mother showed no interest in identifying his father, and he has no siblings. Specific trivia includes an almond allergy, a dislike of melons, and no documented favorite foods. His birthday is September 2nd, making him a Virgo with blood type A. In alternate stories like "Sans Nagito", he assumes antagonistic roles, such as kidnapping Satoru Yonemori, outside the primary canon.