In the episode "Damien", Damien appears as a new student to the third-grade class. Pip was the only one who was willing to become his friend. However, near the end of the episode, Damien almost kills Pip when he showed off his powers at Cartman's party to win the other boys' acceptance.
It also could have originated because both characters seem to have a chaotic nature and have committed some sort of form of arson. Brimmy is shown to throw a Molotov cocktail in the episode "Merry Christmas Charlie Mason!" and Damien is shown to burn several things in the episode "Damien."
This ship is pretty obscure as there are only a few pieces of fanart of the ship.
BrimmyxDamien-Hashtag Dammy tag on Instagram
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