Kyoka Jiro, also known by her hero name "Earphone Jack," is a student at U.A. High School in the anime series Boku no Hero Academia. She is training to become a Pro Hero and is known for her unique Quirk, which allows her to plug her earlobes into objects to channel powerful sound waves. Kyoka is a practical and straightforward individual with a passion for music, often seen playing her guitar. Her character is instrumental in providing support and reconnaissance for her class during battles.