The red Kirby represents Mattel, a round-eyed female fish with a reddish color scheme.
The stage and music track represent Amiy Kingdom, the home kingdom of Mattel located on the sea.
The Starfy Assist Trophy enemy references his appearance as the main playable character in The Legendary Starfy 4 who has a crush on Mattel.
Other trivia:
This spirit's Support and Grab types, and Water/Freezing Resist ↑ ability reference Mattel's role in The Legendary Starfy 4 by asking Starfy to help defeat Degil, who had kidnapped Mattel's fiancee, Prince Coral.
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