Kiritan Tōhoku is one of the three Tōhoku sisters, alongside Zunko and Itako, originating from the Tōhoku region of Japan. In the context of Zunda Horizon, she is presented as a dependable young girl with a calm and somewhat cool demeanor, though her profile highlights a significant fondness for the local dish kiritanpo, which is a primary characteristic. Her catchphrases include expressions of mild indifference, such as whatever or maybe just do xx, which align with her outwardly reserved personality. Despite this cool exterior, Kiritan is portrayed as someone who is always keeping a close watch on her older sister, Zunko, and on Zundamon, indicating a protective and observant nature beneath her quiet surface. She is noted to be eleven years old and has hobbies that include video games, drawing, and doujinshi. Her dream is to be as famous as her older sister Zunko. In terms of appearance, she notably wears kitchen knives in her hair and carries a pair of cannons on her back, which are her primary tools for combat.

Within the story of Zunda Horizon, Kiritan plays a crucial role as a protector. The narrative involves a conflict with the Natto Factory, led by Chanko Ooedo, which fears that the harvesting of edamame for zunda will reduce the quantity of soybeans available for natto. As a result, assassins are sent to Zunko's house. In this conflict, Kiritan is depicted as the sister with unmatched sword skills and the one who ultimately steps up to shield the others when a serious threat emerges. Her abilities are a key part of the story's resolution, with her proficiency with her weaponry being described as more than enough to protect everyone. Her skills officially include kendo, making kiritanpo, and game streaming.

Her key relationships center on her family and companions. As the younger sister, she maintains a close bond with Zunko Tōhoku and Itako Tōhoku, as well as the character Zundamon. Her cool personality often serves as a contrast to Zundamon, who is described as noisy. She also interacts with other characters like Usagi Chuugoku, Metan Shikoku, and Sora Kyushu, who join the Tōhoku sisters in enjoying zunda mochi. Throughout Zunda Horizon, Kiritan demonstrates notable development in the sense that her calm and sometimes distracted nature is set aside when danger approaches. While she might get distracted by tasty food, the moment a real threat like the Natto Factory appears, she becomes the group’s primary defender, using her cannons to protect everyone. Her notable abilities include her unmatched sword skills and her proficiency with the cannons she carries on her back. She also has the practical skill of making kiritanpo, though her primary function in the story is as the combat-capable protector of her group.