Hello! Creating an AI avatar that walks and talks, similar to HeyGen's hyper-realistic video generators, is an exciting project. HeyGen specializes in turning photos or scripts into lifelike talking heads with lip-sync, expressions, and gestures, but adding full-body walking motion pushes it into more advanced territory, blending audio synthesis, facial animation, and body pose estimation. While HeyGen itself is a proprietary platform you can start for free on their site and upload a photo or short video to generate one, building your own from scratch is feasible with open-source tools though it requires some coding and possibly a decent GPU for local runs.