The Hyakki Gokou is a hyper-stylized, ornate mask inspired by Japanese folklore, featuring exaggerated demonic features with sharp, angular lines and intricate engravings. Its surface is a mix of polished black lacquer and metallic gold accents, with glowing red eyes that emit a faint luminous aura. The mask's design includes protruding horns, detailed carvings of mythical creatures, and a menacing grin, embodying a fierce and supernatural aesthetic.