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Grass Demon is the name given to a creature by Sword Finn that originated from the Grassy Wizard's cursed sword. The demon first appears in the episode "Two Swords" where it describes itself as "a curse, an emissary from beyond" before helping Sword Finn escape from inside the Finn Sword.
The demon is a small creature, roughly the size of a human head, that resembles its personal description as "some kind of grass octopus-spider".
From its initial appearance, the Grass Demon maintains a calm and a somewhat cheerful disposition. It seems to enjoy covering surfaces with a sticky substance similar to spider silk as it coated "interior" of the Finn Sword with its webs.