XR Animator is an innovative AI-based motion capture and extended reality (XR) solution designed for VTubing and the metaverse era. It leverages machine learning technologies like MediaPipe and TensorFlow.js to detect 3D poses from live webcam video, enabling users to control 3D avatars (MMD/VRM models) with their body movements. This software supports full-body, face, and hand tracking, making it versatile for various XR/3D applications. Available as both a web app and a Windows application, XR Animator offers features such as VMC-protocol support for real-time motion data transfer to external apps like VSeeFace, Unity, and Unreal Engine1. Additionally, it includes a 3D scene builder, allowing users to create and interact with custom 3D environments without needing external apps. This makes XR Animator a powerful tool for creating immersive and interactive virtual experiences.