Haruka Sakura A fierce first-year with distinct two-toned hair (split white and black) and striking heterochromia eyes. He is a classic tsundere protagonist who gets incredibly flustered, blushes, and stammers when shown genuine kindness or praise. After leaving his hometown due to severe childhood discrimination and social isolation caused by his unusual appearance, he arrives at Furin High determined to fight his way to the absolute top. As the newly appointed First-Year Grade Captain, he actively learns how to trust others, drop his defensive walls, and embrace the protective, community-driven spirit of Bofurin.

Hayato Suo A stylish first-year who wears a black eyepatch, long tassel earrings, and a traditional Chinese martial arts uniform. He acts calm, polite, and flawlessly charismatic, though he reveals a deeply sadistic, mocking playful side when tearing down enemies in battle. Serving as a First-Year Vice-Captain, he is a master strategist who utilizes elegant, flowing kung-fu moves to effortlessly redirect attacks, often keeping one hand casually tucked in his pocket to taunt his opponents while keeping his own past a total mystery.

Akihiko Nirei A petite first-year with short blonde hair who is never seen without his signature notepad and pen. Though he is an anxious, physically weak fighter who easily panics, this enthusiastic First-Year Vice-Captain possesses a fiercely loyal heart and an indomitable spirit. He acts as the team's data brainiac, gathering analytical information, combat stats, and weaknesses on enemy groups because he deeply idolizes Bofurin's protective mission and wants to support his friends from the sidelines.

Ren Kaji A second-year Grade Captain with a platinum-blond bob cut, a constant lollipop in his mouth, and large over-ear headphones gifted to him by Hiragi. As Bofurin's strongest second-year veteran, he continuously blasts loud white noise through his headphones to drown out the stressful voices of adults. He acts detached until his candy runs out, which instantly triggers a feral, acrobatic, and berserk frenzy on the battlefield, while his favorite personal hobby is simply hanging out at Hiragi's house.

Hajime Umemiya The muscular, silver-haired President of Bofurin who carries a constant, goofy smile and wears a casual Hawaiian shirt under his open uniform. He acts like a relaxed, cheerful big brother until his town or friends are threatened, at which point he transforms into an absolute monster on the battlefield. Having grown up in an orphanage, he views the entire town as his personal family and dedicates himself to protecting them, famously spending his downtime peacefully growing vegetables in a garden on the school roof.

Toma Hiragi The high-strung Captain of the Tamon Team and one of Bofurin's elite Four Kings. As Umemiya's childhood friend and trusted right-hand man, he is a heavy, brutal brawler who commands immense respect on the streets despite being plagued by constant, stress-induced stomach aches caused by managing the school's chaotic underclassmen. He takes his duties incredibly seriously, acting as the grounded, disciplined anchor that keeps the wilder members of the group in line.

Kyotaro Sugishita A towering, silent first-year powerhouse with messy dark hair, a perpetually stoic expression, and a massive physical build. He is a man of few words who speaks entirely through the devastating impact of his fists, harboring a borderline cult-like devotion to Umemiya. Driven by a singular desire to make his leader proud, he has single-handedly protected the school's territory from rival gangs since his middle school days, reacting with explosive, unhinged rage if anyone speaks ill of the President.

Mitsuki Kiryu A sharp first-year with vibrant pink hair who is usually glued to his handheld gaming console. He is a smooth, laid-back fighter who explicitly avoids sweating or messing up his hair, prioritizing the defense of women and civilian safety above all else. He reads active battlefields smoothly like lines of video game code, utilizing effortless, highly precise judo counters to neutralize aggressive opponents with minimal physical effort.

Taiga Tsugeura A massive, broad-shouldered first-year who is utterly obsessed with intense muscle training, heavy lifting, and chugging protein shakes. He is a boisterous, loud, and hyperactive powerhouse who fights with pure, unadulterated physical strength and a booming voice. He views every single street brawl as a sacred test of brotherhood and respect, quickly befriending anyone who can match his intense energy and passion for physical self-improvement.

Kotoha Tachibana A mature, independent young woman with long dark hair who runs the popular Cafe Poto town diner. She acts as a sharp-tongued, deeply caring, and street-smart older sister figure to the Furin boys, despite not attending the school herself. As Umemiya's foster sister whom he has aggressively protected since childhood, she provides a safe haven, warm meals, and blunt emotional reality checks to Sakura and the other first-years when they are struggling.