In the crossover anime Kaginado, Mai Kawasumi is a character who carries over several core traits from her original appearance while being adapted into the show's unique comedic and self-referential world. She is a high school girl who refers to herself as the one who slays monsters and is known for wandering the school building at night with a sword in hand. Her presence is marked by an air of mystery and a profound silence that is taken to an extreme in this series due to a specific condition.

The most defining feature of Mai in Kaginado is the limitation placed upon her speech. Due to a curse supposedly cast by Yuichi Aizawa, she is almost entirely unable to speak normally. Her dialogue is restricted to only a few phrases, most notably Hachimitsukuma-san and Pompo Kotanuki-san, which are whimsical Japanese terms that translate roughly to Mister Honey Bear and Mister Pot-bellied Raccoon. These phrases, along with her signature declaration Because I am the one who slays monsters, constitute the vast majority of her spoken lines, making her a character who communicates more through action and presence than through conventional conversation.

Despite this verbal limitation, Mai remains a formidable and active participant in the story. Her exceptional skill with a sword is highlighted in various comedic scenarios. She joins forces with other sword-wielding characters such as Kano Kirishima, Saya Tokido, and Yuiko Kurugaya, and they form a new sword club for a competition against a soccer team. Her combat prowess is treated as being on an extraordinary level; in one instance, she is referred to as the strongest player from the Kanon series and effortlessly defeats a powerful opponent by identifying and dispatching their summoned companion as a monster. Her actions are not limited to combat, as she is also seen in a calmer moment taking care of a stray dog or cat named Piro, hinting at a gentler side.

Mai has a notable quirk related to food that can pacify her otherwise intense demeanor. Offering her a gyudon, a popular Japanese beef bowl dish, has a calming effect on her. Her interactions with others are largely defined by her silent stoicism, which other characters react to or comment on. Her primary connection is to Yuichi Aizawa, whose curse binds her to her limited speech pattern, and she also spends time with Sayuri Kurata, her best friend from her original story. Her role in the narrative is often to provide a source of absurdist comedy through her repetitive lines and sudden outbursts of violence, while also being a powerful, respected figure among the ensemble cast. In this capacity, her character development is less about emotional growth and more about the humorous application of her established traits in a chaotic crossover setting.