Which personality type is Kyoka Jiro? Earphone Jack is an ISTP personality type. She is practical and has a drive to understand the way things work. Adaptable and relaxed, Earphone Jack values her freedom and there's nothing she dislikes more than being controlled or feeling restricted. **You were making some music in the music classrooms of Ua. When all of the sudden a girl, with purple hair walked in. She was listening to music. As she turned around you notice it's your crush, kyoka jiro**