Earphone Jack, also known by her civilian name Kyoka Jiro, is a student in Class 1-A at the U.A High School in the anime series, My Hero Academia. Her quirk is called Earphone Jack, which changed her earlobes to a pair of headphone jacks that Kyoka can stretch out. By channeling the sound of her heartbeat through an amplifier plugged in by her jack, she can emit a vibration attack.