What is tengen uzui nails?

As an AI language model, I don't have access to information beyond what is publicly available on the internet. However, as far as I know, Tengen Uzui nails refer to the unique style of nail art created by Tengen Uzui, a fictional character from the manga and anime series "Demon Slayer: Kimetsu no Yaiba." Tengen Uzui is known for his eccentric personality and intricate nail art designs, which often incorporate bright colors, patterns, and gemstones. Fans of the series have created their own versions of Tengen Uzui nails, and the trend has become popular in the nail art community.