Yona is a character from Steam Fantasy (SF) project. Originally it was planned as concept design/3d modeling workshop where we show how to create a character from concept to 3d model. It's on hold at the moment but maybe someday she'll be back...
Oh now i see,i hope you don't mind me asking 
My motorblade concept looks a bit like that, but i hope you don't mind
My motorblade concept looks a bit like that, but i hope you don't mind