Kineshi Hairo represents class 2-∭ at PK Academy, sporting spiky maroon hair, rolled-up uniform sleeves, and a frequent band-aid on his nose. A recurring gag sees his pants falling during physical activities, exposing his buttocks. He embodies extreme enthusiasm, hot-blooded determination, and strong leadership, rallying classmates with cries like "Let’s regain the innocence of youth!" This earns him deep trust, though his overzealousness spawns impractical choices—hoarding excessive event supplies or building a sports pedestal months early. His occasional lack of common sense manifests in acts like destroying a shutter during a fire drill, mistaking it for a strength test. Academically, he ranks 6th in class but cannot cook. He sleeps nightly by 8:00 p.m. and holds a judo black belt. Hairo generates intense body heat through exertion, instantly melting snow or warming entire rooms, though the ability’s origin remains unexplained. His athletic excellence is typically surpassed by Riki Nendou in direct contests. He favors tennis, recruiting peers like Kusuo Saiki and Nendou for tennis camp, and idolizes retired player Shuzo Matsuoka as his guardian spirit. Hairo declares Nendou his one-sided rival, constantly challenging him despite consistent losses. He admires Nendou’s physical prowess, stating, "I’ve fallen for your principles in life" during a beach encounter. After sumo wrestling where Hairo insisted, "It has to be you, Nendou!", peers speculated about his sexuality. He clarified he is not gay and has never felt romantic attraction, though a "rePSIcled manga" panel hinted at mutual acknowledgment of their bond. Kokomi Teruhashi’s beauty uniquely fails to affect him. He interacts positively with Saiki’s core friends like Shun Kaidou and Aren Kuboyasu. During fitness tests, he obsessively monitored Nendou’s performance. As a leader, his inspiring event management often leads to losses due to flawed strategy. His name puns on "pyrokinesis," reflecting his heat generation. Born June 18, he is a Gemini with blood type AB.