If you want to create some cool and creative anime art, niji・journey is a great option. This AI tool lets you create anime illustrations based on prompts, with upscaling and variation options. It's available through a Discord server so you can interact easily, and it's fine for personal or commercial use.
Another option is Anime Art Studio, a free web-based service that gives you access to more than 100 stable diffusion anime models. It supports a variety of creation tools, including image upscaling, voice generation and text-to-video, so you can be flexible and get high-quality results.
If you want a creative tool with a bunch of anime-inspired options, Yodayo could be worth a look. It's got an AI Art Generator and character creation guides, as well as a chat interface for interactive content. It's also got a subscription option with YoBeans that you can earn through activities, so you can be motivated to keep the creative juices flowing for months.