The red and blue Giant Donkey Kongs each represent the Sumo Brothers, a pair of large, heavyweight wrestlers who wear a red and blue mawashi.
The stage features a circular design in the center, referencing the sumo ring setting of the "Sumo Brothers" minigame in Rhythm Heaven Megamix.
The music represents the musical theme of E. Honda, a sumo wrestler from the Street Fighter series similar to the Sumo Brothers.
Donkey Kong's frequent Hand Slap, the Earthquake rule, and third battle condition reference the gameplay of "Sumo Brothers", where they perform a hand slap, a scenery-shaking stomp, and strike a pose.
Other trivia:
This spirit's Grab type and Weight ↑ ability reference the sport of sumo wrestling where two heavyweight sumo wrestlers try to wrestle their opponent out of the ring, which also requires them to grab their opponents.
