He is a student at Gekkoukan High School and a member of the Specialized Extracurricular Execution Squad. Junpei has dark grayish-black hair, gray-colored eyes and a goatee. He is shown to be slightly taller than the male protagonist, yet shorter than Akihiko. He is often seen with both of his hands on his belt when idle. Junpei is usually portrayed as goofy, immature and upbeat. He fancies himself a ladies' man and frequently tries to hit on girls, with little to no success. 

