Klaus is a 12th century vampire. He is a character who appeared in Hotel Transylvania: The Series.
Klaus enjoys getting the better of his cousin, Mavis whenever they are together and can be a bit of a bully towards her and her friends at the hotel. He really hates it when monsters get his name wrong and whenever Mavis gets the better of him, like when Mavis got him to fall on his face during a high-five moment when they were young; and he had started to plan his revenge to get her back.
Klaus's appearance is similar to vampire Barnabas Collins from Dark Shadows.