Pandora's Actor is a heteromorphic being created by Momonga (later Ainz Ooal Gown) during a period when his creator favored exaggerated and flamboyant behaviors. He serves as the Area Guardian of the Treasury within the Great Tomb of Nazarick, managing its finances, magic items, and world-class artifacts. His appearance features a smooth, egg-shaped head with two black circular eyes and a single mouth, lacking a nose or ears. He typically wears a yellow military-style uniform evocative of historical elite guards, though earlier concepts showed him in a dark suit and glasses. Personality-wise, Pandora's Actor displays overtly theatrical and grandiose mannerisms, employing dramatic gestures, elongated speech patterns, and sporadic German phrases. This behavior embarrasses his creator, who views it as a remnant of his own past eccentricities. Beneath this performative exterior, he exhibits sharp strategic acumen, analytical thinking, and calmness under pressure. He holds loyalty to all 41 Supreme Beings but demonstrates absolute, singular devotion to Ainz, obeying even hypothetical orders to combat other guild members. Unlike most Nazarick NPCs, he proactively seeks task clarification and offers suggestions to optimize outcomes. He maintains a neutral moral alignment despite possessing a negative karma value. His primary ability is shapeshifting, enabling him to replicate the appearance, voice, skills, and memories of any of the 41 Supreme Beings at 80% of their original power output. This excludes unique traits like World Champion abilities or ruler auras, detectable by Nazarick inhabitants. He maintains 45 distinct transformation forms. Additional capabilities include summoning explosive miniature doll replicas of himself and utilizing specialized classes like Expert, Craftsman, and Lord of a Castle for item appraisal and tactical operations. As a level 100 NPC (45 racial levels in Doppelgänger variants, 55 class levels), his attributes include high magical power rivaling Mare's and agility comparable to Aura Bella Fiora. Within the Isekai Quartet crossover, Pandora's Actor functions as a faculty member alongside Roswaal L. Mathers. During a school field day, he collaborated with Vanir and Mr. Rerugen in a cavalry battle against student teams, ultimately tying with Class 1 and losing to Class 2. He was responsible for writing test questions for Class 2. His creation specifically aimed to preserve the identities and legacies of Ainz Ooal Gown's members. Ainz initially confined him to the Treasury due to social embarrassment, deploying him only for critical missions like impersonating guild members, acting as Ainz's body double, or temporarily leading Floor Guardians. He manages withdrawal symptoms without regular contact with magic items and has participated in Nazarick's theater productions, advising Albedo on acting techniques. Guild member Ulbert overruled his near naming as "Surprise Box".