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|Japanese Name||クー, Kū|
|Located||Pitch Dark Cave|
|First Appearance||Densetsu no Starfy 2|
|Latest Appearance||Densetsu no Starfy 2|
Ku (Japanese: クー, from くう [空], literally meaning "sky") is an enemy in Densetsu no Starfy 2. It appears in area 2 of Pitch Dark Cave in a section known as the "Indoor Cave" (Japanese: インドアどうくつ), according to its Picture Book description. It is part of a puzzle related to the land, the sea, and the sky. The other answers are Kai and Riku.