Vivi manages a rundown arcade in downtown Neo San Francisco. Their past includes a celebrated career as MC Bay Bee, initially a professional baseball player who transitioned into music. This public life ended after a confrontation with a mysterious dark entity forced their departure, a pivotal event. Visually, Vivi presents as a drag queen with exaggerated feminine styles and clothing. Despite close friends Winter, Haru, Aki, and Summer knowing Vivi originated as MC Bay Bee, they consistently use she/her pronouns for Vivi. Vivi possesses enhanced stamina, demonstrated by enduring an "Octopi" curse afflicting their back for over a decade, showcasing resilience during conflicts with Seo. At the series climax, Vivi significantly aids the conflict's resolution by providing Muteki and DJ with an Octian Disco ball. This object enables the Mirror Muteking transformation, a fusion-powered form essential for countering Muteking Black and restoring the environment. Vivi's arcade is a recurring setting for interactions with characters like Muteki. Located in the older financial district, it establishes Vivi as a community figure alongside the four sibling patrons who frequent it.