Dreambooth training for Stable Diffusion is extremely powerful. You can train a new token to the "person" class to create very convincing looking images of them. I've posted some examples in the past days.
But it's not the coolest thing you can do...
You can train the "style" class to create new styles. For instance the "arcane" style is well known - it skews all results to this particular Riot games style.