Tutorial if you want, The principle is exactly the same, just for characters instead of different costumes
https://civitai.com/articles/6451/how-to-train-ponyillustrious-lora-with-multiple-costumesI can't claim is the best method or the most optimal or anything, but eh, to me at least the lora works. I'm not a picky person though so may be doesnt fit your standards
