Beta is an elf occupying the second seat among the Seven Shadows, the third initial member of Shadow Garden. Her core duties encompass intelligence gathering, research, and archival work, employing methods from scholarly pursuit to theft. Publicly, she lives as Natsume Kafka, a celebrated author whose published works adapt stories from Earth—narrated to her by Shadow without his awareness or permission. She possesses silver shoulder-length hair featuring an accent braid on the left, blue eyes, and a distinguishing beauty mark beneath her left eye, noted for a voluptuous figure. In Shadow Garden attire, she wears a dark slime bodysuit adorned with gold decorations across the chest, shoulders, arms, and waist, featuring an asymmetrical leg design and ribbon capes secured by gold clasps. As Natsume Kafka, her civilian clothing includes a white ruffled top, high-waisted skirt, black tights, heels, and a scarf, often accessorized with glasses. Beta exhibits absolute devotion to Shadow, embracing any path necessary to achieve his goals, including evil. She maintains a composed, sophisticated exterior that masks her inner thoughts, which emerge only privately. Internally, she grapples with self-doubt alongside intense loyalty, driving actions like secretly authoring "The Chronicles of Master Shadow." This popular series among Shadow Garden members romanticizes Shadow’s deeds, sometimes altering details—such as depicting rescued princesses with her features. Her early Shadow Garden days involved aversion to violence, causing physical distress and insomnia; Shadow alleviated this by recounting Earth tales like *Cinderella* and *Snow White*, which solidified her resolve and deepened her reverence. In combat, she is proficient but not exceptional among the Seven Shadows, regarded as closest to replicating Shadow’s style and earning the epithet "Beta the Steadfast." She employs swordsmanship and later archery using a slime-made bow for ranged support, though her attacks struggle against heavily fortified magic. Magical reinforcement grants significant endurance, enabling her to withstand modern firearms and rapid assaults from stronger opponents; she has intercepted attacks from enhanced foes like Akane Nishino. Beyond combat, Beta excels in intelligence, leveraging fluency in multiple modern and extinct languages and adaptability. She rapidly learns new languages, achieving basic Japanese communication within days of exposure, though usage remained crude. Her field tactics incorporate diverse methods, including seduction. Key involvements include assaults like the Crimson Tower mission and the Bushin Festival. During Earth-related operations, she misinterpreted Shadow’s interest in Akane Nishino, leading her to kidnap Akane and transport her to Shadow Garden’s world, inadvertently facilitating Akane’s recruitment as member No. 712. Trivia notes her Natsume persona uses a push-up bra designed by fellow member Eta. Her pen name merges authors Natsume Sōseki and Franz Kafka. Beta occasionally writes unpublished fanfiction casting herself and Shadow as romantic leads, criticizing these works as self-indulgent.