Professor Membrane

Professor Membrane is Dib and Gaz's father and Zim's father-in-law. He has a wacky hairdo and is very busy. He hates Santa and, for a while, believing Zim was from another country rather than from another planet. It was unknown if he was married, but there's a speculation that he had a wife. He attended his daughter's wedding to Zim and later her coronation.