The blue Luigi represents Hsien, an elderly mustached man who wears a blue robe.
The stage features a checkerboard design, referencing the checkerboards featured in Hsien's debut game, Suijin Taisen: Number Battle.
The music track represents the musical theme of Yūyūki, which features a traditional Japanese aesthetic similar to Number Battle.
The Dr. Kawashima Assist Trophy enemy features floating numbers appearing on-screen, referencing the number tiles in Number Battle.
Other trivia:
This spirit's Support type references Hsien's role in Suijin Taisen: Number Battle as the player's guide.
This spirit's Aura Resist ↑ ability references how Hsien resembles an elderly Japanese priest, who specializes in spiritualism, which is represented by Lucario's aura.
