Something about the harem

I mean 2 characters in the harem are 100% confirmed,like Nuala and Selene.But Lena is doubtful,I mean just saw John Carter yesterday the different ideas I have been getting are endless.So Lena is on hold for now.

I mean there are many Hyperboreans kingdoms like Atlantis,who more less were destroyed(I know Atlantis survived).But making atleast another one of them survive like a kingdom from the movie John Carter would be great,they are technically more advanced it can explained by using hyperborean knowledge.

Also the Princess Dejah Thoris looks amazing.

But the situation is what to do with Dejah,should her kingdom be in a different dimension or concealed somewhere in the world.