The green Kirby represents the Unira, a sea urchin enemy with a green color scheme which appears as the item.
The green Kirby Team references how the Unira is a common enemy in Clu Clu Land who appear in groups.
The stage represents the third level of Donkey Kong, which was released along with Clu Clu Land on the NES.
Other trivia:
This spirit's Unira Equipped ability represents the Unira, which appears as an item in the Super Smash Bros. series.
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The Unira are a clan of nasty sea urchins that stole all the gold ingots from the underwater kingdom of Clu Clu Land. Hiding them throughout their various mazes, they guard their stolen riches with their spiky bodies. An Unira appears in Smash as a throwable item, sticking to platforms and walls before revealing large, dangerous spikes! You can attack it to make them retract, though.
