The Clear Snake represents Ness's Father, who is never seen in-game but is represented through the telephone.
The black Ness minion is based on his appearance in EarthBound, who can contact his father through the telephone.
Other trivia:
This spirit's Support and Shield types reference Ness's Father's role by in EarthBound saving Ness's progress and providing him with money and information.
This spirit's Running Start ability references the telephone's function as a save point in EarthBound, which resets the player's stats prior to their last save.
This spirit is featured in the Timmy & Tommy's shop, which sells spirits related to items, including the telephone used to contact Ness's Father.
