Fuji Musume is based on the famous figure Wisteria Maiden, one of the Otsu-e souvenirs sold in the town of Otsu on Lake Biwa. Fuji Musume was also later popularized as a dance in Kabuki Theater in 1826.
"A girl carrying a branch of wisteria who appears in Katsui Genpachi's nagauta. She commonly appears wearing a hat with a scarlet string and carrying a wisteria branch over her shoulder. Onoe Kikugorō VI performed as Fuji Musume and interpreted her as a wisteria spirit. Additionaly, Fuji Musume is a common theme in oshie hagoita."
Fuji Musume is a demon that begins appearing once the party has entered the Abandoned Factory.
In the Snow Queen Quest of the PlayStation version of Persona, Fuji Musume doesn't appear in Devil's Peak and is exclusive to Hypnos Tower, which can permanently prevent the player from obtaining the Avatar Totem if they do not obtain her Spell Card in Hypnos Tower. This was fixed in the PSP port where she does appear in Devil's Peak.