Kyoka Jiro, daughter of musicians Kyotoku and Mika Jiro, inherited her mother’s Earphone Jack Quirk, manifesting as flexible earlobe jacks that detect vibrations and channel soundwaves into offensive strikes. Though drawn to music early on, she redirected her talents toward heroism to aid others, a path championed by her family. Her dry wit and no-nonsense attitude surface in playful jabs at peers like Denki Kaminari, yet she fiercely defends allies such as Momo Yaoyorozu. Her Quirk synergizes with audio amplifiers in her hero suit, unleashing techniques like Heartbeat Distortion—a seismic blast from amplified sonic pulses—and Counter-Balance, which disrupts incoming auditory assaults. Mentorship under Gang Orca and Death Arms sharpened her tactical reconnaissance skills, though overwhelming sound-based adversaries can overpower her defenses. At U.A. High, insecurities about her unconventional appearance and passion for rock music initially led her to suppress her interests. The U.A. School Festival became a turning point; fronting a band performance solidified her confidence, proving music and heroism could coexist. Collaborative missions further showcased her growth, such as guiding Koji Koda to conquer his insect phobia during their Final Exam clash against Present Mic. Critical battles defined her trajectory: during the U.S.J. invasion, she orchestrated Denki’s Electrification to incapacitate foes, while the Paranormal Liberation War saw her defiance against All For One’s mental domination spark dissent among his stolen Quirks. The Final War cost her left ear and jack, later restored via prosthesis. Her resilience coexists with vulnerabilities—self-doubt, a lingering fear of darkness, and reflexive apologies. Though blunt in dismissing Minoru Mineta’s antics, incidents of his peeping left her grappling with feelings of invisibility. Ranked No. 30 among Pro Heroes post-graduation, she harmonizes her musical roots with tactical leadership, leveraging refined Quirk mastery. Her evolution underscores strategic adaptability and the unsteady yet steadfast journey toward self-assurance.