Kyouka Jirou

A female student with sanpaku eyes and a bob haircut. Her hair shines in a pattern resembling an electrocardiogram.

She refers to herself as "Uchi" and has a straightforward personality, but she is afraid of ghosts and has some girlish traits.

She gets along well with Kaminari, often teasing each other. Occasionally, she calls him "Jammingway." She is self-conscious about her modest bust size, especially surrounded by classmates like Yaoyorozu Momo who have better figures, and is bothered by the fact that Mineta Minoru does not see her as a sexual object unlike other girls.

She is closest to Yaoyorozu Momo among the girls and often acts together with her.

In the past, she was torn between pursuing music and becoming a hero, and when she chose the path of a hero, she tearfully apologized to her parents, who encouraged her to do what she wanted.

Her self-devised hero name is Earphone Jack. Her hero costume, which was modified during the provisional license exam, is equipped with sound amplification (Amp Reverb) devices on both wrists.

She is skilled in playing musical instruments and singing, but feels inferior because her hobbies are not rooted in her hero activities. Encouraged by her class, she becomes the band leader for the cultural festival performance, teaching her band members how to play instruments.

"Quirk": Earphone Jack

By inserting her earlobes, which turn into plugs, she can amplify her own heartbeat to attack or catch faint sounds. The plugs can extend up to about 6 meters.