MMD FaceKey is a Blender add-on that automatically generates control rigs for shapekeys on MikuMikuDance (MMD) character models. The tool is specifically designed to work seamlessly with Genshin Impact and Honkai: Star Rail characters, relying on standard MMD shapekey naming conventions to construct the rig controllers. It supports setting up multiple characters within a single scene, provided the generated rigs are uniquely renamed to prevent conflicts. This tool requires the Cats Blender Plugin to be installed and active to function.