🎤 Miku Discord Bot 💙

The world's #1 Virtual Idol, now in your Discord server! 🌱✨

Features • Quick Start • Architecture • API • Contributing

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🌟 About

Meet Hatsune Miku - a fully-featured, AI-powered Discord bot that brings the cheerful, energetic virtual idol to life in your server! Powered by local LLMs (Llama 3.1), vision models (MiniCPM-V), and a sophisticated autonomous behavior system, Miku can chat, react, share content, and even change her profile picture based on her mood!

Why This Bot?

• 🎭 14 Dynamic Moods - From bubbly to melancholy, Miku's personality adapts
• 🤖 Smart Autonomous Behavior - Context-aware decisions without spamming
• 👁️ Vision Capabilities - Analyzes images, videos, and GIFs in conversations
• 🎨 Auto Profile Pictures - Fetches & crops anime faces from Danbooru based on mood
• 💬 DM Support - Personal conversations with mood tracking
• 🐦 Twitter Integration - Shares Miku-related tweets and figurine announcements
• 🎮 ComfyUI Integration - Natural language image generation requests
• 🔊 Voice Chat Ready - Fish.audio TTS integration (docs included)
• 📊 RESTful API - Full control via HTTP endpoints
• 🐳 Production Ready - Docker Compose with GPU support

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✨ Features

🧠 AI & LLM Integration

• Local LLM Processing with Llama 3.1 8B (via llama.cpp + llama-swap)
• Automatic Model Switching - Text ↔️ Vision models swap on-demand
• OpenAI-Compatible API - Easy migration and integration
• Conversation History - Per-user context with RAG-style retrieval
• Smart Prompting - Mood-aware system prompts with personality profiles

🎭 Mood & Personality System

14 Available Moods (click to expand)

• 😊 Neutral - Classic cheerful Miku
• 😴 Asleep - Sleepy and minimally responsive
• 😪 Sleepy - Getting tired, simple responses
• 🎉 Excited - Extra energetic and enthusiastic
• 💫 Bubbly - Playful and giggly
• 🤔 Curious - Inquisitive and wondering
• 😳 Shy - Blushing and hesitant
• 🤪 Silly - Goofy and fun-loving
• 😠 Angry - Frustrated or upset
• 😤 Irritated - Mildly annoyed
• 😢 Melancholy - Sad and reflective
• 😏 Flirty - Playful and teasing
• 💕 Romantic - Sweet and affectionate
• 🎯 Serious - Focused and thoughtful

• Per-Server Mood Tracking - Different moods in different servers
• DM Mood Persistence - Separate mood state for private conversations
• Automatic Mood Shifts - Responds to conversation sentiment

🤖 Autonomous Behavior System V2

The bot features a sophisticated context-aware decision engine that makes Miku feel alive:

• Intelligent Activity Detection - Tracks message frequency, user presence, and channel activity
• Non-Intrusive - Won't spam or interrupt important conversations
• Mood-Based Personality - Behavioral patterns change with mood
• Multiple Action Types:
  • 💬 General conversation starters
  • 👋 Engaging specific users
  • 🐦 Sharing Miku tweets
  • 💬 Joining ongoing conversations
  • 🎨 Changing profile pictures
  • 😊 Reacting to messages

Rate Limiting: Minimum 30-second cooldown between autonomous actions to prevent spam.

👁️ Vision & Media Processing

• Image Analysis - Describe images shared in chat using MiniCPM-V 4.5
• Video Understanding - Extracts frames and analyzes video content
• GIF Support - Processes animated GIFs (converts to MP4 if needed)
• Embed Content Extraction - Reads Twitter/X embeds without API
• Face Detection - On-demand anime face detection service (GPU-accelerated)

🎨 Dynamic Profile Picture System

• Danbooru Integration - Searches for Miku artwork
• Smart Cropping - Automatic face detection and 1:1 crop
• Mood-Based Selection - Filters by tags matching current mood
• Quality Filtering - Only uses high-quality, safe-rated images
• Fallback System - Graceful degradation if detection fails

🐦 Twitter Features

• Tweet Sharing - Automatically fetches and shares Miku-related tweets
• Figurine Notifications - DM subscribers about new Miku figurine releases
• Embed Compatibility - Uses fxtwitter for better Discord previews
• Duplicate Prevention - Tracks sent tweets to avoid repeats

🎮 ComfyUI Image Generation

• Natural Language Detection - "Draw me as Miku swimming in a pool"
• Workflow Integration - Connects to external ComfyUI instance
• Smart Prompting - Enhances user requests with context

📡 REST API Dashboard

Full-featured FastAPI server with endpoints for:

• Mood management (get/set/reset)
• Conversation history
• Autonomous actions (trigger manually)
• Profile picture updates
• Server configuration
• DM analysis reports

🔧 Developer Features

• Docker Compose Setup - One command deployment
• GPU Acceleration - NVIDIA runtime for models and face detection
• Health Checks - Automatic service monitoring
• Volume Persistence - Conversation history and settings saved
• Hot Reload - Update without restarting (for development)

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🚀 Quick Start

Prerequisites

• Docker & Docker Compose installed
• NVIDIA GPU with CUDA support (for model inference)
• Discord Bot Token (Create one here)
• At least 8GB VRAM recommended (4GB minimum)

Installation

1. Clone the repository

   git clone https://github.com/yourusername/miku-discord.git
   cd miku-discord
   

2. Set up your bot token

   Edit docker-compose.yml and replace the DISCORD_BOT_TOKEN:

   environment:
     - DISCORD_BOT_TOKEN=your_token_here
     - OWNER_USER_ID=your_discord_user_id  # For DM reports
   

3. Add your models

   Place these GGUF models in the models/ directory:

   • Llama-3.1-8B-Instruct-UD-Q4_K_XL.gguf (text model)
   • MiniCPM-V-4_5-Q3_K_S.gguf (vision model)
   • MiniCPM-V-4_5-mmproj-f16.gguf (vision projector)

4. Launch the bot

   docker-compose up -d
   

5. Check logs

   docker-compose logs -f miku-bot
   

6. Access the dashboard

   Open http://localhost:3939 in your browser

Optional: ComfyUI Integration

If you have ComfyUI running, update the path in docker-compose.yml:

volumes:
  - /path/to/your/ComfyUI/output:/app/ComfyUI/output:ro

Optional: Face Detection Service

Start the anime face detector when needed:

docker-compose --profile tools up -d anime-face-detector

Access Gradio UI at http://localhost:7860

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🏗️ Architecture

Service Overview

┌─────────────────────────────────────────────────────────────┐
│                        Discord API                          │
└───────────────────────┬─────────────────────────────────────┘
                        │
                        ▼
┌─────────────────────────────────────────────────────────────┐
│                     Miku Bot (Python)                       │
│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐     │
│  │   Discord    │  │   FastAPI    │  │  Autonomous  │     │
│  │  Event Loop  │  │   Server     │  │    Engine    │     │
│  └──────────────┘  └──────────────┘  └──────────────┘     │
└───────────┬────────────────┬────────────────┬──────────────┘
            │                │                │
            ▼                ▼                ▼
┌─────────────────┐ ┌─────────────────┐ ┌──────────────┐
│   llama-swap    │ │   ComfyUI       │ │ Face Detector│
│  (Model Server) │ │ (Image Gen)     │ │  (On-Demand) │
│                 │ │                 │ │              │
│  • Llama 3.1    │ │  • Workflows    │ │  • Gradio UI │
│  • MiniCPM-V    │ │  • GPU Accel    │ │  • FastAPI   │
│  • Auto-swap    │ │                 │ │              │
└─────────────────┘ └─────────────────┘ └──────────────┘
         │
         ▼
   ┌──────────┐
   │  Models  │
   │  (GGUF)  │
   └──────────┘

Tech Stack

Component	Technology
Bot Framework	Discord.py 2.0+
LLM Backend	llama.cpp + llama-swap
Text Model	Llama 3.1 8B Instruct
Vision Model	MiniCPM-V 4.5
API Server	FastAPI + Uvicorn
Image Gen	ComfyUI (external)
Face Detection	Anime-Face-Detector (Gradio)
Database	JSON files (conversation history, settings)
Containerization	Docker + Docker Compose
GPU Runtime	NVIDIA Container Toolkit

Key Components

1. llama-swap (Model Server)

• Automatically loads/unloads models based on requests
• Prevents VRAM exhaustion by swapping between text and vision models
• OpenAI-compatible /v1/chat/completions endpoint
• Configurable TTL (time-to-live) per model

2. Autonomous Engine V2

• Tracks message activity, user presence, and channel engagement
• Calculates "engagement scores" per server
• Makes context-aware decisions without LLM overhead
• Personality profiles per mood (e.g., shy mood = less engaging)

3. Server Manager

• Per-guild configuration (mood, sleep state, autonomous settings)
• Scheduled tasks (bedtime reminders, autonomous ticks)
• Persistent storage in servers_config.json

4. Conversation History

• Vector-based RAG (Retrieval Augmented Generation)
• Stores last 50 messages per user
• Semantic search using FAISS
• Context injection for continuity

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📡 API Endpoints

The bot runs a FastAPI server on port 3939 with the following endpoints:

Mood Management

Endpoint	Method	Description
/servers/{guild_id}/mood	GET	Get current mood for server
/servers/{guild_id}/mood	POST	Set mood (body: {"mood": "excited"})
/servers/{guild_id}/mood/reset	POST	Reset to neutral mood
/mood	GET	Get DM mood (deprecated, use server-specific)

Autonomous Actions

Endpoint	Method	Description
/autonomous/general	POST	Make Miku say something random
/autonomous/engage	POST	Engage a random user
/autonomous/tweet	POST	Share a Miku tweet
/autonomous/reaction	POST	React to a recent message
/autonomous/custom	POST	Custom prompt (body: {"prompt": "..."})

Profile Pictures

Endpoint	Method	Description
/profile-picture/change	POST	Change profile picture (body: {"mood": "happy"})
/profile-picture/revert	POST	Revert to previous picture
/profile-picture/current	GET	Get current picture metadata

Utilities

Endpoint	Method	Description
/conversation/reset	POST	Clear conversation history for user
/logs	GET	View bot logs (last 1000 lines)
/prompt	GET	View current system prompt
/	GET	Dashboard HTML page

Example Usage

# Set mood to excited
curl -X POST http://localhost:3939/servers/123456789/mood \
  -H "Content-Type: application/json" \
  -d '{"mood": "excited"}'

# Make Miku say something
curl -X POST http://localhost:3939/autonomous/general

# Change profile picture
curl -X POST http://localhost:3939/profile-picture/change \
  -H "Content-Type: application/json" \
  -d '{"mood": "flirty"}'

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🎮 Usage Examples

Basic Interaction

User: Hey Miku! How are you today?
Miku: Miku's doing great! 💙 Thanks for asking! ✨

User: Can you see this? [uploads image]
Miku: Ooh! 👀 I see a cute cat sitting on a keyboard! So fluffy! 🐱

Mood Changes

User: /mood excited
Miku: YAYYY!!! 🎉✨ Miku is SO EXCITED right now!!! Let's have fun! 💙🎶

User: What's your favorite food?
Miku: NEGI!! 🌱🌱🌱 Green onions are THE BEST! Want some?! ✨

Image Generation

User: Draw yourself swimming in a pool
Miku: Ooh! Let me create that for you! 🎨✨ [generates image]

Autonomous Behavior

[After detecting activity in #general]
Miku: Hey everyone! 👋 What are you all talking about? 💙

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🛠️ Configuration

Model Configuration (llama-swap-config.yaml)

models:
  llama3.1:
    cmd: /app/llama-server --port ${PORT} --model /models/Llama-3.1-8B-Instruct-UD-Q4_K_XL.gguf -ngl 99
    ttl: 1800  # 30 minutes
    
  vision:
    cmd: /app/llama-server --port ${PORT} --model /models/MiniCPM-V-4_5-Q3_K_S.gguf --mmproj /models/MiniCPM-V-4_5-mmproj-f16.gguf
    ttl: 900   # 15 minutes

Environment Variables

Variable	Default	Description
DISCORD_BOT_TOKEN	Required	Your Discord bot token
OWNER_USER_ID	Optional	Your Discord user ID (for DM reports)
LLAMA_URL	http://llama-swap:8080	Model server endpoint
TEXT_MODEL	llama3.1	Text generation model name
VISION_MODEL	vision	Vision model name

Persistent Storage

All data is stored in bot/memory/:

• servers_config.json - Per-server settings
• autonomous_config.json - Autonomous behavior settings
• conversation_history/ - User conversation data
• profile_pictures/ - Downloaded profile pictures
• dms/ - DM conversation logs
• figurine_subscribers.json - Figurine notification subscribers

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📚 Documentation

Detailed documentation available in the readmes/ directory:

• AUTONOMOUS_V2_IMPLEMENTED.md - Autonomous system V2 details
• VOICE_CHAT_IMPLEMENTATION.md - Fish.audio TTS integration guide
• PROFILE_PICTURE_FEATURE.md - Profile picture system
• FACE_DETECTION_API_MIGRATION.md - Face detection setup
• DM_ANALYSIS_FEATURE.md - DM interaction analytics
• MOOD_SYSTEM_ANALYSIS.md - Mood system deep dive
• QUICK_REFERENCE.md - llama.cpp setup and migration guide

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🐛 Troubleshooting

Bot won't start

Check if models are loaded:

docker-compose logs llama-swap

Verify GPU access:

docker run --rm --runtime=nvidia nvidia/cuda:11.8.0-base-ubuntu22.04 nvidia-smi

High VRAM usage

• Lower the -ngl parameter in llama-swap-config.yaml (reduce GPU layers)
• Reduce context size with -c parameter
• Use smaller quantization (Q3 instead of Q4)

Autonomous actions not triggering

• Check autonomous_config.json - ensure enabled and cooldown settings
• Verify activity in server (bot tracks engagement)
• Check logs for decision engine output

Face detection not working

• Ensure GPU is available: docker-compose --profile tools up -d anime-face-detector
• Check API health: curl http://localhost:6078/health
• View Gradio UI: http://localhost:7860

Models switching too frequently

Increase TTL in llama-swap-config.yaml:

ttl: 3600  # 1 hour instead of 30 minutes

Development Setup

For local development without Docker:

# Install dependencies
cd bot
pip install -r requirements.txt

# Set environment variables
export DISCORD_BOT_TOKEN="your_token"
export LLAMA_URL="http://localhost:8080"

# Run the bot
python bot.py

Code Style

• Use type hints where possible
• Follow PEP 8 conventions
• Add docstrings to functions
• Comment complex logic

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📝 License

This project is provided as-is for educational and personal use. Please respect:

• Discord's Terms of Service
• Crypton Future Media's Piapro Character License
• Model licenses (Llama 3.1, MiniCPM-V)

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🙏 Acknowledgments

• Crypton Future Media - For creating Hatsune Miku
• llama.cpp - For efficient local LLM inference
• mostlygeek/llama-swap - For brilliant model management
• Discord.py - For the excellent Discord API wrapper
• OpenAI - For the API standard
• MiniCPM-V Team - For the amazing vision model
• Danbooru - For the artwork API

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💙 Support

If you enjoy this project:

• ⭐ Star this repository
• 🐛 Report bugs via Issues
• 💬 Share your Miku bot setup in Discussions
• 🎤 Listen to some Miku songs!

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Made with 💙 by a Miku fan, for Miku fans

"The future begins now!" - Hatsune Miku 🎶✨

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