The blue Dr. Mario represents Dr. Thomas Light, the scientific creator of Mega Man who shares the title of doctor and wears a similar lab coat.
The stage represents Wily Castle, the fortress of Dr. Wily, who was originally Dr. Light's colleague until he later turned to villainy.
The battle conditions reference Dr. Light's pacifistic personality, where he doesn't wish for the Robot Masters to cause harm.
Other trivia:
This spirit's Support type references Dr. Light's role in the Mega Man series as Mega Man's creator.
This spirit's Shield type and Zap-Floor Immunity ability reference how Dr. Light programmed Mega Man to save the world from Dr. Wily and his Robot Masters.
In World of Light, the Dr. Light spirit is located in the Power Plant map in the Light Realm, a sub-dungeon occupied by electronic-themed spirits, referencing Dr. Light's association with electronic automatons.
