Carrera, a Porsche-named succubus from the demon world, forms contracts with humans, granting wishes in exchange for souls. She operates alongside partners and rivals Mercedes and Rati, acknowledged as the most successful soul collector among them due to experience and effectiveness, though sometimes careless in her duties. Her appearance features cyan hair, red eyes, and a buxom, sexually attractive figure.

Summoned by human Ogawa, Carrera offers a standard contract: pleasure her completely to avoid losing his soul. Unexpectedly, Ogawa fulfills this condition through nearly unlimited energy, becoming the first human to satisfy her sexually. Consequently, Carrera returns to the demon world without claiming his soul—an unprecedented career failure. This failure results in punishment from the demon lords, who imprison her with magical chains for five days. During this vulnerable imprisonment, Mercedes and Rati take advantage to have sex with her. The demon lords later demand she return to claim Ogawa’s soul, fearing his power could disrupt their war against angels, but Carrera resists.

After her release, Ogawa summons Carrera again, having developed feelings. During this encounter, angels capture both Carrera and Rati, intending purification using "holy water" through sexual means. Carrera withstands this attempt, proving "Too Kinky to Torture." Ogawa then collaborates with Mercedes and Alphina to rescue them. Unable to return to the demon world following these events, Carrera decides to live permanently with Ogawa, joined by Mercedes and Rati.

Carrera appears across official franchise media including the original game *Viper V-6* ("The Devil Came" storyline), its direct sequel *Viper GTS*, *Viper-M1*, *Gokuraku VIPER Paradice*, *Typing VIPER*, multiple drama collections, novel editions, official art books, illustration compilations, and fan books. Her character design evolves across these appearances, with variations documented in art books and figurine sets depicting both original and OVA-style designs.