@ThoughtfulForest I agree with BlueRaser, Xianyun and Lisa are suitable for Ren, as for Rex, the most suitable are the Raiden sisters, Makoto and Ei, and Kitsune Saigu from Inazuma or the Cryo duo of Liyue, Ganyu and Shenhe.
There are no more suitable women for Ren and Rex than these, on the other hand, isn't Ren married to Fu Hua?