Limitless Heroics is a crowd-funded (unofficial) Dungeons & Dragones 5edition compatible rulebook for creating and playing characters with disabilities, mental illness, and neurodivergence. I made a nerdy joke about my own ADHD on twitter and as a result, got invited to participate in this very cool project.
All of the characters above were submitted as written descriptions by their creators--D&D players, who in some cases had been playing them for decades. It was up to me to design and visualise them, working closely with each player/creator.