If you go for kemono, you should not be buying regular meshes. The kemono is significantly thinner than the regular avatar and the 2.0. It will not look good. Do not convince yourself it looks good. It doesn't. Also, joint deforms.
Avatar 2.0 is the body you should be going with if you want to wear default clothing. However, as people have said, it doesn't make a good little girl. More of a teenager. It's less popular and harder to dress, though- you have to look for default clothes that fit it or specially made avatar 2.0 clothes for more skintight options.
There are, however, tons of kemono clothes out there and the great thing about them is that they're mostly mod and include AO bakes. You can change the color, add designs, or retexture an item entirely to fit your needs (including alpha masking parts out.) You will end up looking like everyone else at first if you use a kemono though.
As for heads, you can try the M3 anime head, or you can look into the Zero Style body/head (found inworld). Or the Mokyu heads. Both aren't as quality as Utilizator's heads (not as many features, meshes aren't as optimized), but a lot of people find the M3 head to look bad. Like an anime fetus. You may need to learn to modify textures to use them though, since there are few mods for them.