Gwen Tennyson
Moana
One Piece - Nami, Boa Hancock, Nico Robin
Naruto - Tsunade
I think Nami would be a good one; her personality is pretty distinct from the girls already in the game, orange hair would also set her apart from the other girls, she has tons of different outfits that she wears in the show/manga so Akabur would have no shortage of wardrobe customization ideas, and none of the girls are from any eastern media yet so that would be another way she adds to the diversity of the crew.