"snake spirits which could transform into human, half-man half-serpent called Nagas/Nagini by indians." - @oluwoleolaide

Thank you for your post! I am going off on a tangent here but this immediately made me think of Nagini - Voldemort's snake. We do not get too much information about her, other than that she is extremely powerful. I had always assumed that this power came from her being bound to Voldemort as a horcrux but now with your post I am wondering if she was one of these snake spirits - perhaps from a strong line. I wonder if she made the autonomous choice to join with Voldemort. He does treat her more gently and respectfully than almost any human and puts more trust in her too. I always thought that this was only because she was literally a part of him. An origin story about Nagini would be very interesting! Thanks for the food for thought!