Awesome model [insert hysteric screaming fangirl]
As a suggestion: You could model something Lamia/Naga-like as amphibic creature. Would need two different animations for swimming (torso in line with tail) and wiggling (torso vertical and tail vertical), but could be introduced directly as a mod without bigger AI-changes (except that water doesn’t play any important role in the game for now).
Hope to see more from you.