Leonardo is a general-purpose AI image generator that produces high-quality imagery at a consistent pace. It's got a lot of bells and whistles, like AI Canvas for fine tuning designs, 3D texture generation and fine tuned models for anime and photorealism. That makes it good for creative tasks like character design and concept art.
Another good option is Musavir, which offers a range of styles including 3D and anime. The service lets you generate high-quality images from text prompts without having to be a skilled artist. It's got Explore Styles, with eight different styles, and comes in several pricing tiers depending on your needs.
ZMO is another good option. It's got an AI anime generator with more than 30 styles, but also other tools like AI photo generation for photorealistic portraits and a photo editor with no seams. It's got a clean interface and is updated regularly, so it's good for pros and amateurs looking to make something new and interesting fast.