Klaus, also known as Krauss in some translations, is a supporting character in the anime Delico’s Nursery. He is a central figure in the overarching lore of the series, identified as the True of Vamp, the legendary progenitor of the vampire race. In the narrative, his true identity is a closely guarded secret that becomes a pivotal revelation. The character Johannes Vlad, in an effort to protect Ul Delico from the anti‑social organization Pendulum, discloses that the True of Vamp is a man named Krauss, or Klaus. This revelation positions Klaus as a key figure in the conflict between the vampire aristocracy and Pendulum.

Klaus’s background as the original vampire places him at the foundation of vampire society, but he is largely removed from the immediate events of the story. The anime occasionally shifts focus to him, indicating his importance to the broader mysteries of the series. His personality and motivations are not extensively detailed, but his ancient origin and the secrecy surrounding his existence suggest a deliberate and enigmatic nature. His role is more that of a symbol or a hidden linchpin than an active participant in the day‑to‑day events. His relationships with other characters, particularly Johannes Vlad and the Pendulum organization, are defined by the power and knowledge he possesses. His abilities are implied to be immense, consistent with his status as the progenitor of vampires, though specific powers are not elaborated in the series. Throughout the story, Klaus’s significance gradually unfolds, marking him as a character whose very existence shapes the world of Delico’s Nursery and its connections to the broader TRUMP universe.