Not sure why this is downvoted. Civitai does in fact list a bunch of fine tuned models and can be sorted by highest ranked, liked, downloaded, etc. It is a good resource. Many of the models are also available in the .safetensor format so you dont have to worry about a pickled checkpoint.
I didn't downvote but I have to say the images shown on that page are hilariously juvenile. I was a teenager once so I get it but I'm guessing the content is where the downvotes are coming from?
Looking at this site, I would argue that the canonical "hello world" of an image diffusion model is a picture of a pretty woman. The canonical "hello world" for community chatbots that can run on a consumer GPU will undoubtedly be an AI girlfriend.
BTW I love your app! At my desk I use Automatic1111 (because I have a decent GPU), but it's so nice to have a lean back experience on my iPad. Also, even my 6yo son can use it, as he doesn't need to manipulate a mouse.