Mr Vandemar is one of the bad guys in Neil Gaiman's novel Neverwhere. His partner in crime is Mr Croup. Mr Croup is definitely the brains, Mr Vandemar the muscle. He's incredibly strong and vicious, and almost always hungry, and he'll eat anything, but most favourably pigeons, caught with his own hands, which he'll bite the heads off. He wears rings that are raven's skull. He's amusing as well as being bloodthirsty.

In Terry Pratchett's The Truth, the equivalent character is Mr Tulip.