The Mii Swordfighter represents Arthur, the knight-in-shining-armor protagonist of the Ghosts 'n Goblins series.
The red Ridley minion represents Red Arremer, a winged demon with a red color scheme who the most notorious enemy of the Ghosts 'n Goblins series.
The stage represents the graveyard, the first stage in Ghosts 'n Goblins which features petrified trees and a dark background.
The Throwing Type items reference the various weapons that can be thrown at enemies in Ghosts 'n Goblins.
The Ridley minion's frequent Wing Blitz references the battle against Red Arremer in Ghosts 'n Goblins where he will swoop down to attack the player.
Other trivia:
This spirit's Grab type and Item Throw ↑ ability references the weapons-throwing gameplay mechanic of the Ghosts 'n Goblins series.
