Tiny Buddy puts a small 3D Steve or Alex on your screen.

On join, one of them is picked at random and stays for the session. They wander the HUD, look around, idle, swing a sword, mine a fake block, and sometimes lie down on a tiny bed. None of that touches the real world. No blocks break, no packets go out, and it works on multiplayer servers.
What it does
What it does not do