Shikimi is a grey-haired kunoichi-in-training at Shinobi Gakuen, distinguished by her glasses and serious expression. She serves as the group's Combat Medic, wielding extensive knowledge of medicinal herbs and potions while maintaining competence in standard combat. Her ninja teleportation technique operates slower than her peers', producing a distinctive warping effect on her surroundings.

Her appearance consistently features a side ponytail secured with a hairclip and boots as standard attire, though she occasionally wears her hair down. Shikimi possesses a level-headed and rational personality, acting as a steady counterbalance to the eccentricities of classmates like Yusura and Himeji.

A secret connection defines part of her background: a bond with Nanafushi, a male ninja from a nearby rival boys' school. This began when she found him immobilized by a leg injury at the bottom of a mountain pit and treated him. Despite others perceiving their rapport as romantic, they deliberately maintain a casual friendship with limited contact. Nanafushi appears intermittently during critical moments to aid her, reflecting the series' theme of star-crossed relationships between rival schools.

Throughout both seasons, Shikimi participates in group activities and missions. These include constructing a giant karakuri mecha for an inter-school competition, investigating local legends like an old Sage behind a waterfall, facing ninja exams with expulsion risks, and navigating classroom traps. Her herbal expertise proves vital during these events. In a significant second-season arc, she joins the entire group and their teacher Hayato on a journey into Himeji's mind to cure her affliction, demonstrating their reliance on collective effort.

Shikimi's character maintains consistency across the series without major personal transformations. Her primary role supports group cohesion through her specialized knowledge and composed nature.