Another good option is ComicsMaker.ai, which uses AI to do a lot of the heavy lifting when it comes to creating a comic. It's got a variety of tools like Text to Image, Image to Image and ControlNet, as well as character training and high realism options. You can create and download comics as PDFs or CBZs, so it's good for both hobbyists and pros.
If you want a more photorealistic look, Neural Canvas offers an AI-powered service to create comics in a variety of moods and styles. It's got more than 100 characters, and you can license the comics for commercial use. It's easy to use, so even people with no artistic ability can create interesting comic books.
Last, AI Comic Factory can automatically create comics in a variety of comic styles and layouts. You can upload your own images to customize the look of your comics, and it's got options for interesting captions and character continuity. It's good for casual creators and comic enthusiasts.