Izumi Tokutomi, a 16-year-old high school girl born on February 12, 2007, exudes cheerfulness and directness, traits mirrored in her vibrant appearance. Her short orange hair, bright yellow eyes, and playful hair accessories—decorated with circular and X-shaped charms—complement her confident, active lifestyle, often showcased through casual midriff-baring outfits. Hailing from a family that runs a fish shop, her daily ties to the business remain vague, though her mahjong prowess, honed during lively family gatherings, positions her as the top player among her peers.

She mentors friends like Nashiko Jippensha with a humorous flair, dubbing the automatic mahjong table "Janta-kun" and whimsically naming the mahjong spirit "Chonbo." This habit of assigning quirky labels extends to her online persona: the username "2 of 2 no Izumichi" emerged from her irritation at common name variations being taken.

Beneath her bold exterior lies a fear of festivals and the supernatural, stemming from a childhood scare involving a festival demon at the "Betcher Festival." Despite this, she remains a lively fixture at her group’s hangout—a converted mahjong parlor she helps maintain after Nashiko’s invitation. Her interactions brim with energy and humor, anchoring her role within the group, while her personal narrative stays rooted in these established traits rather than evolving through broader media explorations.