ComicsMaker.ai is an online tool that uses AI tools like Text to Image, Image to Image and ControlNet to automate much of the comic creation process. It's got a lot of features like Pose Creation, Inpainting and Character Training that let you train your own characters and create high-realism art. The service is available for commercial use under the Creative ML OpenRAIL-M license, and you can publish your comics to earn credits.
Another good option is the AI Comic Factory, which uses Hugging Face Space to create comics. It's got a variety of styles, including American, Japanese and Nihonga, and different layout options and snappy captions. The service also lets you upload your own images to customize the look of your comics, and it can keep characters consistent from one story to another.
If you want a tool that's geared more toward character creation and scenery generation, Shortbread is worth a look. It lets you create your own characters, pose and stage them in panels, generate backgrounds and select styles for different genres. It's designed to help you turn your ideas into comics that are engaging and well-made as quickly and easily as possible.