Creatures from other dimensions, magical or otherwise, that have been featured in the series.
Green-skinned humanoids from an unknown dimension. They have immense strength, and can live to be four hundred years old. Miss Skullnick was turned into one in the episode "Match Maker."
Tiny, light blue-skinned humanoids that are native to Pixtopia
. They have small wings and are ruled by an empress
Square-shaped creatures who behave similarly to stereotypical nerds. Their home dimension is unknown, but they frequently visit the Amethyst Arcade
A multi-headed serpent that is native to the Forest of Certain Death
Other creatures native to the Forest of Certain Death. They are sentient bushes with beaks, yellow eyes and small, wood-like legs.
Small green-skinned humanoids from an unknown dimension.
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