What element do you like playing the most?

Assuming that you're going to commit to P2W elements...
Water:
Ryu-Oh is nice, with her triple debuffs. Combined with Vohu (against Fire), she covers all debuffs and leaves two spots open for whatever team you want.
Shiva is basically Asherah 1.5.
Aphrodite has heals and coveted buffs, allowing you to make tankier types of teams. I wouldn't recommend a MT on her though.

Wind:
Gaia is pretty much the only one you lack. Combined with your other Hime, there should be literally no content that you couldn't handle with your Wind with Gaia in your arsenal. Still, Gaia is extremely defensive and would rarely - if ever - actually make your team, so I wouldn't really recommend it.