As a kitsune, Spooky can be a trickster. Lumi is one of these tricks. Lumi is not a real person, even within the fictional world he exists in. Lumi is merely Spooky pretending to be something she isn't for the fun of it. Also, if you're wondering why there are two color palettes it is because ermines change color based on the season.
Note: Lumi is not a canon form and was only created for a singular roleplay