Albedo serves as the Overseer of the Floor Guardians within the Great Tomb of Nazarick, holding authority over all non-player characters in the tomb. Created by guild member Tabula Smaragdina, she possesses heteromorphic traits: jet-black hair, golden vertically slit pupils, large horns protruding from her temples, and a pair of black angel wings at her waist. She typically wears a pure white dress, white gloves, and a distinctive golden spiderweb necklace covering her shoulders and chest. For combat, she dons black full plate armor and wields a battle-axe. Shalltear Bloodfallen has referenced her potentially large "true form" during their arguments, though specifics remain unconfirmed. Shortly before YGGDRASIL's shutdown, Momonga (later Ainz Ooal Gown) altered her original programming, changing her settings to be "madly in love" with him. This results in extreme, obsessive devotion to Ainz, manifesting as intense jealousy toward anyone perceived as close to him, protective aggression if he is threatened or insulted, and overt romantic pursuit. She accepts that Ainz, as a Supreme Ruler, might have multiple partners but expects to be his primary consort. Her personality combines calculated level-headedness in administration with underlying cruelty and disdain toward humans, whom she views as inferior. She maintains a composed, elegant demeanor as a mask for ruthless tendencies that surface against enemies of Nazarick. Within Isekai Quartet's school environment, she adapts, holding the position of class vice-representative alongside Ainz. While her hostility toward classmates is reduced compared to her original series, her core traits persist. Her rivalry with Shalltear continues, involving disputes over Ainz's affection or competitive insults. She develops an unexpected rapport with Aqua after Aqua defends her against Shalltear's taunts about her virginity, though she remains wary of Aqua's threats toward Ainz. She dismisses Kazuma Sato as "gross" due to his humanity and criticizes Megumin's fashion choices after overhearing Ainz's potential interest. Her interactions extend to other characters: she clashes with Emilia upon the latter's election as class representative but later collaborates with her to combat the Destroyer. She relates to Petelgeuse Romanee-Conti through their shared obsessive approaches to love, even adopting his verbal tic of ending sentences with "death." She exhibits persistent jealousy toward Tanya von Degurechaff due to Tanya's frequent proximity to Ainz. During school events, she displays impatience with slower participants like Vooren Grantz and prioritizes shielding Ainz from physical threats, such as using a barrier to protect him during a dodgeball game. Her role as Guardian Overseer translates into diligent participation in school management and event coordination. She references her duty to monitor all Floor Guardians' locations and leverages her administrative skills for tasks like organizing bookshelves. Though her violent impulses are subdued in this comedic setting, her fierce loyalty to Ainz remains central, driving actions such as crafting elaborate chocolates for him during Valentine's Day, which Subaru Natsuki acknowledges as "full of love" despite finding it excessive.