I just ran into model that nails Ars Almal without bleeding into looking like Gura or Kanata
https://huggingface.co/Cubort/Radiencev2I'm not a fan of the NAI/Anything style this model does, be warned. Quick and dirty test in the pic.
I don't know how many obscure Nijis this covers but I'm hoping it can cover the ones that aren't in our current prompt list! I did see a Sukoya Kana lora go up on civitai the other day, so if you're her fan then it's an option.