You're morally opposed to fictional characters marrying because they share 12.5% of their fictional DNA, in the same game where a 9-year-old girl can be impregnated and no one bats an eyelash.
I liked them in general, especially ones with backstory like Astram x Jeorge. I just felt like there were a lot of missed opportunities. Ogma, Caeda, and Sirius in particular should have had more.
Kagero is the best if you leave them all as ninjas. Kaze has bad strength and Saizo has bad speed.
Kaze is the best with favoritism (Dread Scroll + Arms Scroll).