Webcurrently, there are nine hashira, each of them representing a specific breathing style that they have adopted to and developed. As for the sound hashira, the. Webtengen uzui's sound breathing technique is an exceptional breathing style in demon slayer. Here's how it works. Webthe sound breathing (音 おと の 呼 こ 吸 きゅう oto no kokyū?) is a breathing style unique only to the sound hashira tengen uzui. The sound breathing is branched out. Webas a hashira, uzui is considered to be among the elite within the corps, and his specialty is the sound breathing technique, a unique form of combat that utilizes sound. Webtengen uzui (宇 (う) 髄 (ずい) 天 (てん) 元 (げん) uzui tengen?) is a major supporting character of demon slayer: Kimetsu no yaiba and a major character in the.