That art page with all the characters is beautiful. Look at how vibrant, colourful and interesting the characters we've seen are. Big props to Kev and Steve!
The skeleton girl is great. Yes, she can't walk, but we don't know if she can't move. I mean, Trowzer doesn't look like he can move either, but where there's a will there's a way...
I reckon she might be the one who transforms Yooka and Laylee. You don't need to walk anywhere to do that -- just look at Mumbo and Humba.