Caviar-kun, formally known as Ossetra Sevruga von Veluga, is a young male fairy sporting jet-black hair and matching eyes. He hails from considerable wealth, a status underscored by the constant presence of his dedicated butler. This attendant meticulously caters to Caviar-kun's needs and acts as a walking encyclopedia, offering detailed explanations about the various foods encountered in their environment, reflecting the character's privileged norm.

Identified as a fairy, Caviar-kun resides within a bustling, Hakata-inspired shopping district populated by other food-themed characters. His narrative centers on engaging in the district's everyday happenings and lighthearted activities, frequently alongside his ever-present butler. Explicitly tagged as both "Child" and "Wealthy," these labels solidify his youthful portrayal and significant socioeconomic privilege.