Kyoka Jiro (耳じ郎ろう響きょう香か, Jirō Kyōka?), also known as the Hearing Hero: Earphone Jack (ヒアヒーローイヤホン=ジャック, Hia Hīrō Iyahon Jakku?), was a student in Class 1-A at U.A. High School, training to become a Hero.

Eight years after the Final War, Kyoka has graduated from U.A. High School alongside her classmates, and is currently the No. 30 Hero. She has also become a musician and Eri's mentor.