NSFW
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Read up a bit on Succubi on Wikipedia (that's a totally reliable source, right?) and found out that in some folklore they look like beautiful women from far away until closer inspection and when you can see their bird like feet. Also, in India a succubus is draped in a white saree. I combined both ideas. Next up is "true monster" which is the vaguest theme ever.
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30 DAY MONSTER GIRL CHALLENGE
- Harpy
- Centaur
- Slime
- Naga
- Mermaid
- Spider Girl
- Plant Girl
- Octomaid
- Demon
- Succubus
- True Monster
- Zombie
- Insect Girl
- Dullahan
- Dragon/Reptile Girl
- Ghost
- Robot
- Alien
- Cyclops
- Satyr
- Canine Girl
- Feline Girl
- Yōkai
- Multiple Limbs
- Favorite Monster Girl
- Favorite Monster Girl Character
- A Truly Gruesome Girl
- A Group of Monster Girls Together
- A Monster Girl and Her Significant Other
- Celebrate Monster Girls!