Tsunagu Hakamada operates as the Pro Hero Best Jeanist, wielding the Quirk Fiber Master to manipulate diverse fibers. Denim serves as his optimal medium, though he extends control to industrial materials like carbon fiber cables for large-scale operations. This complex ability demands significant technical skill—its difficulty deterring major villains from theft attempts. Effectiveness varies by material, excelling with denim while diminishing with sweats. Key applications encompass ultimate moves: Blackout Bind, Catching Cradle, Clothing Is the Cage of Our Times, and Thread of Hope. Hailing from Japan's denim capital, Okayama Prefecture, Tsunagu attended U.A. High School. There he founded the Textile Arts Association and forged a lasting bond with Shinya Kamihara. Rising to professional hero status post-graduation, he achieved top-five national ranking and established the Genius Office agency. He mandates denim uniforms for all sidekicks to maximize his Quirk's potential. His reputation includes eight consecutive Best Jeanist awards, recognized in-universe and real-world events. A dedicated reformer, he specifically targets troubled youths for mentorship despite typically attracting well-behaved interns. Visually distinctive, Tsunagu possesses a tall, slender frame, sharp eyes, and an unnaturally long neck. His signature blond hair obscures one eye. His costume is entirely denim: a high-collared shirt covering his lower face, jeans, waistcoat, initialed belts, and boots. Post-lung loss, his attire darkens with a redesigned buckle. Eight years later, lighter denim features baggier sleeves with laced cuffs, visible eyes, and right-swept curled bangs. Post-war modifications incorporate industrial-strength fiber cables for restraining exceptionally powerful adversaries. His personality merges elegance, flamboyance, and strict professionalism. He champions the belief that public figures must embody impeccable physical and social appearances to inspire societal peace. Abrasive behavior conflicts with his ideals, driving his reform efforts on individuals like Katsuki Bakugo. He demonstrates selflessness in combat, prioritizing ally protection at great personal risk. This commitment extends to mentorship, where he emphasizes hero names as expressions of identity and responsibility. Despite initial frustrations with Bakugo's stubbornness, their relationship evolves into mutual respect—Bakugo privately shares his chosen hero name with Tsunagu first. Key chronological involvements begin in *Vigilantes*, responding to Instant Villain outbreaks in Naruhata and participating in the Sky Egg crisis. During Sky Egg, he coordinated evacuations, restrained bombers, and stabilized collapsing structures with carbon fiber cables. He later pursued the vigilante The Crawler, acknowledging his unsung heroism while upholding professional duties. In the main series, Tsunagu recruits Bakugo post-U.A. Sports Festival, aiming to correct his aggression through lectures, enforced hairstyling, and Quirk-based restraint. Their contentious dynamic lays groundwork for Bakugo's growth. During the Kamino Incident, Tsunagu confronted All For One, restraining him briefly before suffering severe injuries including lung loss, necessitating extended medical leave. His hero ranking nevertheless rose to No. 3. As the Paranormal Liberation War escalates, Tsunagu resurfaces after faking death via medical stasis at Hawks' request to infiltrate villains. His dramatic return involves aerial deployment with steel cables to immobilize Gigantomachia and multiple high-profile villains simultaneously, altering the war's trajectory. Prolonged stasis causes visible deterioration—coughing and eye hemorrhaging—during this effort. In the Final War, Tsunagu leads airborne teams against Tomura Shigaraki. He performs emergency cardiac suturing on Bakugo using his fibers. Post-conflict, he aids societal stabilization, visits Hawks' mother, and discusses familial strategies with Endeavor's family regarding Dabi's revelations. Eight years later, he remains an active hero, his updated costume and hairstyle reflecting enduring commitment.