EchoMimics

EchoMimics

EchoMimics makes the Masked enemies in Lethal Company sound like the people in your crew.

The mod listens to opted-in players during a round, remembers useful parts of the conversation, and gives nearby Masked enemies short contextual replies. The reply is written locally by Qwen3.5 2B and spoken locally with a clone of the copied crewmate's voice using Audio8 TTS 0.1B.

Everything runs on the host computer. There are no API keys, subscriptions, or cloud AI services.

What the mod does

When your crew talks during a round, EchoMimics can:

• Detect when someone is speaking without requiring a special push-to-talk key.
• Transcribe that speech locally with Whisper.
• Remember recent conversation from the current round.
• Give a nearby Masked enemy the identity of the crewmate it copied.
• Generate a short lie, warning, plea, or lure that fits the current situation.
• Speak from the Masked enemy's position using the copied crewmate's voice.
• Play the same generated voice for every modded player in the lobby.

EchoMimics does not replace the normal enemy AI. Masked enemies remain hostile and continue to move, chase, hide, and attack normally. The language model cannot control the enemy, run commands, access files, or use game tools.

Important privacy warning

This mod performs voice cloning.

Every player must understand what the mod does and agree before enabling voice capture. Voice capture is disabled by default on every installation. A player must set AllowVoiceCapture to true before their microphone is recorded.

The host computer receives short voice clips from participating players because the host performs the local transcription and voice generation. The data is not uploaded to an AI service.

During a round, the host stores:

• A bounded list of recent transcripts.
• The newest usable reference clip for each participating player.
• The exact transcript that belongs to that reference clip.

Round data is deleted when the round ends. If the game or runtime closes unexpectedly, the host can delete the data folder inside BepInEx/plugins/EchoMimics to remove all remaining voice references and transcripts.

Do not use this mod to clone someone who has not consented.

Requirements

Every player needs

• Lethal Company v81 on Windows.
• The same EchoMimics version.
• BepInExPack 5.4.2100, normally installed by the mod manager.
• A working in-game microphone.

The host also needs

• Windows 10 or Windows 11.
• Python 3.11.
• Ollama.
• Around 8 GB of free disk space for packages and model files.
• An NVIDIA CUDA GPU is strongly recommended.
• 8 GB or more VRAM is recommended.

Audio8 can run on a CPU, but replies will usually be too slow for natural gameplay. Only the host needs to install and run the local AI runtime.

Easy installation with a mod manager

Use these steps with r2modman or the Mod Manager.

• Create or select your Lethal Company profile.
• Search for EchoMimics and install it.
• Make sure every person joining the lobby installs the exact same version.
• Start the game once with the modded profile.
• Close the game after reaching the main menu.

The mod files should now be located at:

BepInEx/plugins/EchoMimics/

Manual installation

• Install BepInExPack 5.4.2100.
• Download the EchoMimics ZIP.
• Open the ZIP.
• Copy its BepInEx folder into the Lethal Company profile or game folder that already contains your BepInEx installation.
• Allow Windows to merge the folders.
• Confirm that this file exists:

BepInEx/plugins/EchoMimics/EchoMimics.dll

Do not copy EchoMimics.dll into the game root.

Host setup

Only the person hosting the lobby performs this section.

Step 1: Open the EchoMimics folder

In r2modman:

• Select your Lethal Company profile.
• Open Settings.
• Select Browse profile folder.
• Open BepInEx, then plugins, then EchoMimics.

Step 2: Run the setup script

Right-click inside the EchoMimics folder and choose Open in Terminal, then run:

powershell -ExecutionPolicy Byp