permanently ?? You can always switch between human and animal forms unless it's part of some story narrative . Normally I'll chose human form but you do the animal versions so well I don't mind if you decide to stay that way .
It is a nice idea to play with, and Yin His made a very nice transition to human. On the other hand, the human version of Sonny is rather "blah" - it doesn't add anything to her character, and she looks so much like Sandybell that you could easily confuse the two together.
I have tried once or twice to "convert" some of my furry characters into humans - it worked in two cases, but has failed in all others. My recommendation is to leave your Anabantha girls just as they are, and then to create a new and unique set of human characters. You have a few such characters in your Jab Archives gallery, and I would enjoy seeing more. I understand that this means creating a new history and setting for the characters, but in the end it is worth it. Plus, you can always have your own characters "cross over" and meet every so often.