Katsuki Bakugō trains as a pro hero at U.A. High School, wielding the Quirk "Explosion." This power generates detonations from a nitroglycerin-like substance secreted through his palms, enabling offensive strikes and mobility tactics like propulsion and shockwaves. Overexertion strains his arms and shoulders. Born to Mitsuki and Masaru Bakugō, he exhibited an explosive personality early—marked by arrogance and relentless competitiveness. He tormented his Quirkless childhood friend Izuku Midoriya, dubbing him "Deku." Driven by idolizing All Might, Bakugō fiercely pursued becoming the top hero. Academically gifted, he ranked third in U.A.'s Class 1-A behind Momo Yaoyorozu and Tenya Iida. His tactical brilliance surfaced when he deduced Midoriya inherited One For All from All Might and pinpointed Kurogiri as the villains' weak point during the U.S.J. incident. The Paranormal Liberation War scarred Bakugō’s left shoulder and lower abdomen. In the Final War against All For One-possessed Tomura Shigaraki, he intercepted a fatal blow aimed at Midoriya, suffering a near-deadly chest wound. Edgeshot sacrificed himself to repair Bakugō’s heart, leaving a suture scar. Bakugō’s crushed right arm relied on All Might’s armored suit for support. Post-surgery rehabilitation left prominent scars across his right cheek and from elbow to clavicle, prompting a costume modification with a concealing black sleeve. In *World Heroes' Mission*, Bakugō joined a global operation against Humarise. Deployed to Otheon under Endeavor’s agency, he raided a decoy headquarters. When the mission stalled, he pursued a jewel thief while Midoriya and Shoto Todoroki chased another. Bakugō captured his target but failed to reclaim the stolen briefcase. Discovering a data disk inside a decoy, he instantly identified the file revealing Humarise leader Flect Turn’s location, circumventing exhaustive analysis. Storming Humarise’s true base, he outmaneuvered the Serpenters twins by planting grenades strategically despite their enhanced Quirks. Bakugō’s evolution intensified through early failures. Kidnapping by the League of Villains and All Might’s retirement seeded profound guilt. His aggression caused him to fail the Provisional Hero License Exam, yet he later acknowledged Midoriya’s worth. During the "Dark Deku" arc, he publicly apologized for past bullying, admitting envy of Midoriya’s innate heroism. By the Final War, he prioritized rescue over victory, sacrificing himself for Midoriya. Eight years post-Final War, Bakugō graduated U.A. and became the No. 5 Pro Hero "Dynamight." His costume retained its original design with streamlined "Grenadier Bracers" resembling smoke grenades and braids evoking lit fuses. After a sidekick stint under Best Jeanist, he funded a support suit enabling Midoriya’s continued hero work.