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Kelkie (Japanese:ケルキー, Kerukī) is an ability in Densetsu no Starfy 4. It is the first transformation found in the game. Amiiyoshino gives it to Starfy. When using it, Starfy or Starly ride a red seahorse. Kelkie sleeps on the ground when Starfy or Starly aren't riding her. Kelkie is first found in Tree of Beginning (Stage 2-2).
When no buttons are pressed, Kelkie will sink to the ocean floor. The control pad can be used to move Kelkie left or right. If the A button is pressed, Kelkie will jump up and rise slightly. If the B button is pressed, Kelkie will perform an uppercut attack which can defeat enemies.