Anime Art Studio is a full-featured web-based service with more than 100 stable diffusion anime models. It's got tools to upscale images, generate voices and turn text into video animation, all without any cost or registration requirement. That makes it good for personal and commercial use.
If you want something more interactive, niji・journey lets you create high-quality anime images with AI prompts. The service has upscaling and variation tools, and you can interact with the AI through a Discord server, so it's good for personal or commercial use.