I have a couple of options here for CR. Aerith tends to be a very kind and understanding person and I think there's a lot of potential for them to get to know one another and maybe be good for each other.

I also have Kisara who shares a crime of Fratricide with Runyu and that could be a strong connecting point.

(I'm canon blind, but what little I've found here really speaks to me and I'm incredibly intrigued.)