Sounds like an interesting idea to me, though wouldn't something like that be more likely to be associated with the llamia tribes? After all, a fish is just a water snake with fins
And the animations for land travel are already set in place by the llamia themselves. Making it wiggle under water/in the air wouldn't be very difficult. However, fitting it with the varying sized character models, and then also having to remove their lower body you automatically have a problem right there. After all, some armours are full body, it simply wouldn't work /sad I just ruined it for myself by over thinking...
Awww I liked the idea too... bugger