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Artist's commentary
Yokai!
It took a damn while to find out Yokai Spirits suitable for the girls but I guess these were the best options:
Ranma - Yūrei
Akane - Hannya
Shampoo - Nekomata
Kodachi - Hone-Onna
Ukyo - Kanedama
Special Thanks to a follower “ExoSkell” that helped me with suggestions and ideas, specially Akane and Ranma Yokai Spirits