The intent of this topic is generating discussion about the must-have kamihime for each element, and what a nearly-optimal team would look like that doesn't depend too much on RNG or having rerolled 1000x.
This is the general consensus on first picks I've seen:
Water: Cthulhu
Fire: Amaterasu or maybe Svarog
Wind: Gaia
Thunder: ?
Light: Sol
Dark: ?