If you're looking for a service to generate custom 3D characters from text prompts, Tafi is a powerful option. It's got a Text-to-3D AI character engine that lets you create characters from text prompts and offers dynamic, high-resolution and exportable assets. It also offers access to millions of assets and custom content services, so it's a good option for a broad range of customers.
Another good option is 3DFY.ai. This AI system generates 3D models from text prompts or single images, with quad-meshed topology, high-quality UV maps and physically-based rendering materials. It can handle multiple levels of detail and has uses in simulation, gaming and AR/VR, so it's a good option for both individuals and companies.
If you want a more general-purpose tool, Meshy can handle both text-to-3D and image-to-3D generation, as well as AI texturing and fast performance. It can handle a range of art styles and export in several formats, good for AR/VR, gaming and digital design. Meshy also comes with community resources and several pricing tiers for different needs. Masterpiece X is another option, with a browser-based interface for quick creation and prototyping of 3D models, including full characters and animals, without any programming knowledge. It's got flexible pricing and unlimited downloads that work with common apps and game engines.