Profile
A PNGTuber setup is the leanest avatar stack: illustrated PNG sprites, hotkeys or simple apps to swap mouths, and OBS Studio to stream. No Live2D Cubism license required.
Build steps
Commission or draw a sprite sheet, map keys to expressions, add mic audio in OBS. Read the PNGTuber wiki term for format context and free VTuber models for cheap asset ideas.
When to outgrow it
If you want face tracking and smoother motion, move to premade models and VTube Studio or VSeeFace.