I used to roleplay a superheroine I created, Dawn. After years doing that, I knew her well enough to start writing books (adult, with BDSM elements) about her and I started a series: https://www.amazon.com/dp/B0CG5FV492
And, of course, I needed covers, wanted to visualize her scenes, plan a comic book for Dawn. And here I am, still learning to do all those things.