The base SS Lora is that. There's a problem with it however. The Lora is trained for free on civitai AI, and they have a 10k step limit for training. The more images your dataset contains, the more steps you'll need.
Including all or most of the characters causes the training to require more than 10k steps. As it is, the current Lora is undertrained.
To solve this, we can purchase GPU time to do our training somewhere else than civitai, or train locally with a beefy GPU.
When SD3 comes out, I expect to purchase GPU time to create a new and improved lora. However, it firsts needs to come out. We also might need a sexual base checkpoint like pony diffusion or we'll waste our time. And the full tech update has to release so we have access to high resolution images.