I have pretty much taken what I own, I do have Yamaziko but find her a little too fragile and have been underwhelmed with her, but then I did use her massively with Misaki in 1.5 because she was dirty good.
I don't own Lynch, and aren't too bothered about going down the Neverborn route. I did want to take Kang's upgrade but found it difficult to find room, dropping an Oiran would give the stones to take the upgrade, but would leave me with 3 stones wasted wouldn't it?