Who is your favorite underrated Monster Girl enemy from any JRPG\WRPG and why?

I have a lot that I like, mostly from JRPG and of any species, but my favorites are the hereby depicted serpentine babes:

Final Fantasy 9 - Madam Lamia
Final Fantasy 9 - Marilith

Really dig the color schemes, the perfect hybridization of monster-like features together with humanoid features, the femininty in the mannerism of Madam Lamia and how Marilith's body merges into a serpentine tail.

Both very underrated designs.