Lonely Demon

The lonely demon was the first paranormal creature to be encountered in Plumber Who. It was first introduced in "The T.O.I.L.E.T.".

According to the lonely demon, he died many years ago, wandering the deserts alone. He came across Will, and wanted to use his body as a friend, (which means killing him so there is another spirit with him. The lonely demon was watching Will for a few nights, and when the Plumber came along, it ruined the demon's plan. He then possessed Will, which then tried to kill the Plumber.

The Plumber escaped possessed Will, hiding behind a bush. The Plumber was soon caught, but got up and said this to defeat the demon, "I now banish you to an eternal realm of flushing!". This caused the demon to die, but it isn't the only one. It isn't confirmed yet if we will see more of the lonely demon in later seasons to come.