Klaus is a vampire demon wolf, he's about 7ft tall, he uses small crimson glasses, he has red eyes and a big crimson wings, he has a well-defined body, strong and muscular, a big mane that cover a great part of his neck, fluffy and soft fur, his fur is brown colored, with his chest and a diamond-like symbol on his arm being a lighter brown, he usually wears social clothes, he's obviously the demon king, but despite the tile, he's not a bad guy.