The Giant Mii Brawler's Bionic Helmet and Mecha Suit represent the giant robot from the Toy-Con Robot Kit game.
The Mii Brawler minion's Toy-Con Visor and Outfit represent the player controlling the Toy-Con Robot through the Toy-Con Robot Kit.
The stage and music track represent the main city setting of the Toy-Con Robot Kit game, which features a giant playable battling robot.
The "increased attack power" battle condition references the Toy-Con Robot's usage of powerful punches.
Other trivia:
This spirit's Attack type and Fist Attack ↑ ability further references the Toy-Con Robot's usage of powerful punch attacks.
