Lumpi is the son of uncle Ludwig and aunt Hildegard and a very sleepy character. He is pretty moody and is often together with humans limited to humans "of his age". His parents are not very delighted of this and uncle Ludwig regrets Lumpi's des-interest for the tradition and culture of the vampires. When Anton comes into the vault Lumpi first is disappointed of him like of all humans. There is no clear picture of Lumpi because whenever he appears again he changed in someway. So he is very understanding when he watches Rudiger and Anna at Anton's tea party and unusually vivacious when he joins the Everything-is-forgiven-party. Apart from that he helps Rudiger to take his casket in Anton's cellar and his friends help the Vampire family moving away.