Katsuki Bakugo, a U.A. High School student, wields an explosive Quirk fueled by nitroglycerin-like sweat ignited from his palms. Early acclaim for this power fostered a superiority complex, driving him to bully a Quirkless childhood peer—a dynamic that evolved when both entered U.A. His relentless ambition and contempt for perceived weakness gradually morphed into strategic competitiveness, though his brash, confrontational nature persisted. During internships, mentors like Best Jeanist refined his public image through costume modifications. By the World Heroes’ Mission, he donned a stealth suit under the Endeavor Agency: black neoprene with orange accents, updated grenade-shaped bracers, and the World Heroes Association insignia. Tasked with dismantling Humarise, a terrorist group deploying chemically amplified Trigger Bombs to exterminate Quirk users, Bakugo joined peers in a covert operation. Facing high-ranking operatives, he displayed unexpected tactical adaptability alongside his trademark volatility, prioritizing teamwork over lone aggression. Post-mission scars—a stitched cheekmark and temporarily impaired right arm—marked his physical trials, later rehabilitated. As the No. 15 Pro Hero in adulthood, his streamlined costume incorporated smoke grenade-inspired bracers, while braided hair mimicked lit fuses. His journey traces a shift from unchecked fury to focused intensity, blending raw power with accountability. Collaborative efforts, such as the Otheon operation, underscored his ability to coordinate under pressure without softening his abrasive edge.