Jack is a male adolescent character from the anime Bikkuri-Men. He is a first-year student at Dokkiri High School. Physically, Jack has orange hair that reaches his neck and yellow eyes, and his typical attire includes a school uniform with a cap and tie.

Jack works part-time at the Angel Mart Bikkuri No store alongside his colleague Ushiwaka. He is characterized as a dedicated Bikkuri-Man enthusiast, described as an otaku of the franchise, and his hobby is playing the bass guitar. Within the narrative, he possesses the factor of Tenshi Otoko Jack, connecting him directly to the original sticker character that serves as the basis for his design. He is also noted to have been born in England, but cannot speak English. A notable aspect of his personal life is his romantic interest in a female student named Cross, who attends the same school.