"John Mantle" is a nickname given to the Shadow Mantle Holder by the Deltarune community, referencing how it gives you the Mantle. "Jane Mantle" was a sub-joke of this, but I turned her into a separate character based on the unused "Sky Mantle" armor that protects against Elec/Holy attacks, or, in Spamton Sweepstakes, Spamton mentions, "Thunder/Light" attacks.
