The Hyakki Gokou is a hyper-stylized, ornate weapon with a curved, asymmetrical blade that glows with a vibrant, luminous energy. The blade's surface is smooth and polished, featuring intricate engravings of mythical creatures that seem to move under the glowing light. The hilt is wrapped in dark leather, contrasting with the bright, metallic finish of the blade, and is adorned with small, iridescent crystals that pulse with energy.