Advanced Fake Player

Fake players are spawned as real players on the server and are injected into the game's internal player systems instead of being scripted NPCs. A player can possess one of them, so keyboard and mouse input is redirected through a custom network packet route and the fake player receives it in real time. Placing blocks, breaking blocks, attacking entities, interacting with GUIs, opening chests and crafting all work through the possessed player.

Because a fake player counts as a real authenticated player from the server's point of view, it triggers pressure plates and tripwires, takes part in mob spawning, has its own local difficulty based on position and time spent online, and collides with entities. Mobs can target it as they would any player. The mod is built for multiplayer testing, so one client can exercise server behavior that normally needs a second PC or account. Advanced Fake Player requires Fabric API on Fabric and runs on client and server.

Commands and selectors are compatible, so fake players can be targeted by command blocks and datapacks. Files are published for Fabric, Forge and NeoForge, for 1.20.1 and 1.21.1, with the latest builds released under the MIT License. The project is not open source.