What do you mean raynu? It's pronounced rain... ok, I see the problem typing that out. Still raynu reads completely different, unless they used some slightly altered copyright avoiding name.
Looked it up and we know from JoJolion chapter 99 that male human x female rock human is possible, but there's no examples of the reverse. Which sounds to me like it'd be a normal rock human, but doesn't explicitly say.
Two chapters in a row that Usagi mentions TWD.
The way they keep teasing us about Charming you know there has to be something up. The mention of family doesn't sound like the usual rock human mo though. Maybe some human cross species? The mention of clan to me gives the impression their traits...
https://mangadex.org/title/77cd186d-0a3f-4f24-9cdd-505c1fa9d245/your-girlfriend-is-about-to-do-something-super-amazing
Found it with a bit of Googling.