Matsuri, whose full name is Matsuri Souma, is a supporting character in the anime Isuca. She serves as the attendant and assistant to Suseri Shimazu, a cousin of the main protagonist Sakuya Shimazu. Matsuri's background is closely tied to the Shimazu family's world of specter hunting and magical combat, where she operates as a support specialist. Her primary responsibility is to aid Suseri in her schemes and battles, often acting as a calm and composed presence. However, when Suseri's well-being or objectives are threatened, Matsuri reveals a surprisingly bold and assertive side, showing fierce loyalty to her mistress. Her motivations stem from her dedication to Suseri, and she is willing to take risks to protect her. In the story, Matsuri plays a key role in supporting Suseri during conflicts with Sakuya and the protagonist Shinichiro Asano, as well as in fights against various specters. Her relationship with Suseri is the most significant, as she follows her orders and watches over her, while her interactions with Sakuya and Shinichiro are more adversarial, given the rivalry between the two Shimazu cousins. Matsuri does not undergo major character development within the anime, remaining primarily a reliable support figure. Her notable abilities include expertise in healing spells, which allow her to treat injuries and lower collateral damage during battles, and the use of protective barriers and talismans to shield allies from harm. These skills make her an effective defensive specialist, though she rarely takes an offensive role.