Melon Curry Mai is too adorable. I think the Airi comparison is a good one, I'll need to see her perform to know for sure, but right now she seems to have a bit of that "it" factor that Airi has.
Man I have no idea why I'm already so into these girls already LOL But yeah Mai and Uta are my favourites right now and I do think Risa is the beauty, she's just got a polish to her already. If I end up liking their music and how they are produced as well, then I'm a goner