Source: Hololive (Virtual YouTuber)

Koseki Bijou is a small but resilient rock-themed idol. Her design is characterized by her greyish "stone" color palette, crystalline hair ornaments, and a tiny gem on her forehead.

🗝 Core Activation & Appearance

Use these essential tags to activate Bijou's core identity:

👗 Outfit Library

1. Default "Jewel" Dress

white dress, bare shoulders, off-shoulder dress, detached sleeves, detached collar, purple ribbon, crystal ornaments, frills

Her primary debut outfit. It features a regal, white crystalline dress with many floating or detached elements that emphasize her "unbound" jewel nature.

2. New Year Kimono

kimono, japanese clothes, purple kimono, floral print, sash, obi, wide sleeves, long sleeves, hair flower, kanzashi

Her elegant traditional Japanese attire. Usually maintains her purple and grey color scheme with intricate floral patterns on the silk.

⚙️ Recommended Settings

• LoRA Weight: $0.8$ to $1.0$.
• Model Compatibility: Specifically optimized for IllustriousXL.
• Prompting Tip: To get her signature "Biboo" energy, use tags like grin, mischievous, or smug. For her rock-like features, you can add stone skin (subtly) or shiny crystals.
• Negative Prompt: tall, large breasts. (Bijou is famously "flat" and "smol").

📷 SFW Prompt Example (Default Outfit)

Prompt:

koseki bijou, 1girl, solo, short stature, grey hair, purple eyes, forehead gem, cry