Ultimate, I'd be lucky to even get 1/2 of enemy hp regardless of having an element bonus against them.

All my current Kamihime are.
SSR: Michael
SR: Artemis, Uranus, Agni, Oceanus, Hermod, Lightspeed hermod, Belphegor, Ramiel, Freja, Heimdallr, Ceridwen, Lu Bu, Baal, Iblis, Oberon, Cybele, Amon, Guan Yu and Nike.
R: Dike, Rakshasa, Boreas, Scathach, Urania, Reginleiv, Caspiel, Baphomet, Nergal, Apasra, Undine, Dagon, Circe, Ignis, Skuld, Oto-Hime, Astaroth, Rusalka, Puck, Zephyrus, Perun, Verethragna, Dazbog and Indra.

I've mostly stuck to 1 element tho so that I receive my weapon skills on that element accordingly for more damage and survivability. For the current event I'm using Mordred for the meantime, otherwise I usually use Andromeda simply because I don't have much survivability in general.