The red Yoshi represents Nibbles, a dinosaur character who features a red-and-white color scheme.
The red Charizard, Ridley, and Bowser minions each represent Nibbles's battle evolution forms: Munchsaurus, Chompsaurus, and Crimson Ravager.
The stage represents the arenas featured in the Fire Emblem series, a role-playing game similar to the Fossil Fighters series.
The stage's polygonal shape references the polygonal shape of a tile in a typical Fossil Battle's battlefield in the Fossil Fighters series.
The Pitfall item references how Nibbles and his battle evolution forms are vivosaurs, a series of revitalized fossils dug up from the earth.
Other trivia:
In World of Light, the Nibbles spirit is located at a set of unearthed dinosaur bones in the Badlands area in the Light Realm, referencing how Nibbles is a vivosaur who is revitalized from fossils.
