Carolus is an ancient Nameless and the secret Emanator of Trailblaze, personally blessed by Akivili long before Isee boarded the Astral Express, who conceals his true identity behind the guise of an ordinary traveler, charming others with his sly, flirtatious, and calm personality, long slick white hair, captivating magenta eyes flecked with green, and fashionable outfits decorated with little bells gifted by Aha, while remaining a keen observer of the Nameless after Akivili's disappearance, until the Astral Express crashes on Planarcadia and his unexpected reunion with Asat Pramad, disguised as Dean Ryusuke, threatens to expose the centuries-old secret he has carefully kept hidden.
