Kyōka Jirō trains as a hero-in-training at U.A. High School, wielding the sound-manipulation Quirk Earphone Jack. Headphone jacks extending from her earlobes serve as versatile tools: detecting vibrations, transmitting audio across vast ranges, and channeling her amplified heartbeat into concussive vibrational attacks. These jacks stretch meters in length, synergizing with amplifiers on her costume to unleash shockwaves capable of pulverizing stone or scattering adversaries. Rigorous cliffside drills sharpened her auditory precision, while internships under heroes like Gang Orca refined her combat acumen. Petite and fair-skinned, Kyōka’s striking features include dark purple hair cut asymmetrically with sound-wave-patterned bangs and angular onyx eyes. Her evolving hero attire progresses from a punk-inspired ensemble—black leather jacket, ripped salmon shirt, and speaker-enhanced boots—to upgraded gear featuring forearm amplifiers, chevron face paint, and a prosthetic ear replacing her left jack lost in the Final War. A waistcoat often replaces her U.A. blazer, signaling her self-reliant nature. Blunt and sardonic, Kyōka peppers interactions with sarcasm and playful jabs from her jacks, particularly targeting classmates like Denki Kaminari. Yet beneath her aloof exterior lies fierce loyalty, evident in her unwavering defense of close allies such as Momo Yaoyorozu. Early struggles with self-doubt—stemming from insecurities about her appearance and passion for music—culminated in a transformative U.A. School Festival performance, where she led a rock band, reconciling her artistic identity with heroic aspirations. Ranked seventh in midterms, her tactical intellect shines in battles leveraging seismic vibrations, sonic counters like Counter-Balance, and strategic ambushes—notably against Nine on Nabu Island. During the Final War, her resolve ignited rebellion among vestiges of stolen Quirks, aiding All For One’s defeat. Allies and foes alike recognize her unyielding tenacity. Post-graduation, Kyōka ascends to the No. 30 Pro Hero rank, mentors Eri, and balances heroics with a burgeoning music career. Her journey traces a growth arc from sarcastic outsider to poised leader, overcoming self-consciousness about praise, discomfort with horror and nudity, and the challenge of harmonizing dual passions.