Gryll is the final boss of Kirby's Super Star Stacker. This boss appears after the credits roll in the main game, as a surprise encounter if Kirby managed to beat all his previous foes without losing once, and is the most difficult challenge in the game. Gryll appears to be some sort of space-traveling witch who flies around on a broomstick.
Unlike the other opponents, Kirby challenges Gryll out in space. Gryll attacks Kirby by thwacking him with a broomstick.
Gryll makes a cameo as a sticker in Kirby: Planet Robobot, even in international regions. Gryll also appears alongside Brobo as one of the Stone transformations in Kirby Star Allies and can be seen in the Celebration Picture 'Bad Boss Brothers'.
- Although Gryll's appearance would suggest that Gryll is female, this boss is referred to by neuter or male pronouns in the game itself. Ultimately it is unclear what Gryll's gender is, or if Gryll even has one.