If you want to use AI to generate characters in different anime styles, the AI Anime Generator could be the ticket. It lets you create anime characters from text prompts with no drawing ability, producing high-resolution images in a matter of seconds. It can handle a broad range of anime styles and substyles, so you can create characters that match your preferences. It's free and commercially licensed, so it's good for any creative project.
Another option is Anime Art Studio, a web-based service that lets you use more than 100 anime models at any time of day. It's free, with no requirement to sign up or pay, and you can create anime images, voices, videos and animations. The service has tools to upscale images, generate prompts and more, so it's a good all-purpose anime tool.
If you want to use photos as a starting point, Anime AI could be a good choice. It lets you generate custom anime-style images from photos you upload, with a range of styles including One Piece, Naruto and Webtoon. You can pick different character attributes, so you can generate a range of anime characters more easily and cheaply.
Last, ZMO is another AI image generation system with an anime generator with more than 30 styles. It's got a range of tools, from photorealistic portraits to background changers, and offers free and premium versions. ZMO is good for content creators who need high-quality, customizable images quickly.