I took the trouble to research and collect where the original models of Slendytubbies 2 and 3 enemies came from.
The Unity Asset Store is the Unity store where you can find several of these models, the rest you can find yourself.
I know I am missing the Ranged New Born model, I couldn't find it. Just as I suspect Ghost Girl has one.

Much of the information was taken from:
https://custard.fandom.com/wiki/Enemies


Music:
   • Slendytubbies 3 The Superiority REMIX...  
   • Slendytubbies 2D: Soundtrack (Menu Mu...