The teal Mr. Game & Watch puppet fighter represents the Primid, a teal-armored enemy created by Mr. Game & Watch's Shadow Bugs who appears multiple times on-screen.
The stage represents the first stage of "The Subspace Emissary", which takes place on a single floating platform in a crowded stadium and first features the Primids as enemies.
Other trivia:
In World of Light, the Primid spirit is located in the Base map, which resembles the design of the nineteenth stage of "The Subspace Emissary", which features the Primids as enemies.
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The foot soldiers of the Subspace Army. Like all members of said army, Primids are made of Shadow Bugs, small embodiments of primordial darkness. By themselves, these guys are fairly harmless, but they are the basis for other, stronger types of Primids: some carry weapons, some control fire, some are made of metal, and some are just really big!