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Negative Rigby has an ability similar to that of werewolves, as he scratches his victims to turn them into other negative demons, although his power had no effect other than amnesia upon dying/returning to the mirror dimension.
He is voiced by Roger Craig Smith.
Negative Rigby looks like a monstrous, muscular Rigby, though this may not be its true form, as it will become whatever species the person trying to break the jinx is. It has purple eyes, black skin/fur, and white outlines, giving the appeal that the monster is in a negative art style.
- How Rigby summons the monster to unjinx himself is similar to the Bloody Mary myth. The myth goes: if you lock yourself (or more people) in the bathroom, turn the lights off, look into a mirror and say "Bloody Mary" (in this case "Rigby") three times, then you would see Bloody Mary. This is similar to what Rigby did since he did all of the things you do for the Bloody Mary myth, though Rigby adds two more things (the water faucets and writing his name).
- The way to banish the demon back to its dimension is by the victim saying their name backward, which in Rigby's case, was "Ybgir". Incidentally, another character who is a Rigby doppelganger is called Ygbir.
- When people are scratched by Negative Rigby, it seems to give them a beard and claws.
- He was not revived by GBF jr. in "Exit 9B".