Yuri Alpha serves as vice-captain of the Pleiades Six Stars battle maid squad, a defensive unit within the Great Tomb of Nazarick created by Yamaiko. Her primary function involves delaying intruder incursions until stronger Nazarick forces mobilize. Her appearance features black hair in a low bun, grey eyes behind black lensless glasses, and a distinctive blue collar or choker essential for her Dullahan racial class to keep her head attached. Her battle maid outfit prioritizes mobility, lacking a front skirt plate, and includes thick spiked bracers. Personally lawful good with +150 karma, Yuri feels relief when instructed to avoid killing humans without justification and voluntarily aids impoverished populations when autonomous. Privately using the masculine pronoun "boku" hints at a childish aspect beneath her stern, teacher-like demeanor. She exhibits workaholic tendencies, struggles with unstructured free time, and frequently assumes leadership roles. Her undead nature imposes a coldly analytical mindset, though she occasionally displays brief emotional surges inherited from her creator before suppressing them. Her activities include escorting villagers to Nazarick, hosting internal auctions for Ainz Ooal Gown, participating in staged battles under Demiurge's plans, confronting intruders like the Dragon Hunt worker team, and training human maids such as Tuare. She proposed educational systems to identify talent and received authorization to build orphanages using Sorcerer Kingdom resources, freeing confined NPCs Pestonya and Nigredo for this initiative. In the crossover setting, she attends Class 1. Loyal to Ainz Ooal Gown, she regrets circumstances forcing battles against his disguised class. She observes classmates' capabilities, identifying Reinhard van Astrea as a significant threat and warning Ainz. She participates in school committees and group activities like karaoke with other Pleiades members. She describes Subaru Natsuki as "mysterious" during his karaoke club part-time work. Her chronological involvements span guarding Nazarick's 9th Floor, treasury operations, surface battles against workers, imperial delegation receptions, and preserving defeated enemies' remains. She joined the Pleiades in surveying dimensional cracks threatening Nazarick, gathering critical data on chaos beast emergence patterns to facilitate countermeasures.