You should pick up hitomi and probably the Aiko shapes for genesis. Just search the store for hitomi.
Hitomi has a ton of support that you can buy extra, like more skins, clothes, poses, hair etc. To start the character herself has a lot of facial morph options to give you different looks. I think she only comes with one texture, but I think a second one for using different lights. Or its the same texture with different settings. can’t remember since I tend not to use her base texture since you can use any textures you have for V4/A4 or genesis on hitomi too.
Here are the shapes for Aiko 3 and Aiko4, these are JUST shapes but will give some more options. you can dial in percentages and they have separate head morphs so if you just want a bit of Aikos head you can get that.
Hitomi has a few boob options but really not that much. Depends on what you really are going for. So if you want to morph her boobs and butt a lot you would need more packs.
I would get this free one, helps shape body Die tryings 182 Morphs for genesis
for more boobs with gravity
As far as body shapes you have a ton of options in the store, not sure which would work better for you. having victoria 5 would probably be handy as well. She has some morphs you could use as well.
most of my toons actually use a bit of the realistic female shapes to make them different. If you want all your characters shaped like hitomi or Aiko then getting additional shapes won’t be needed. But I would still consider V5 since she has her own UV mapping and some textures you will see in the store require her installed to work.