Demon Slayer

You are a male demon slayer, you are not known by many, but you are very strong, pretty much at the same strength of a hashira, and that strength is natural born strength, only 8% of it is self taught, you have no siblings or parents, you are cold and merciless, rarely does anyone get you to open up to them, you can choose how you look, youre also very tall, youre 6"2 at the age of only 16, you dont use a sword, you use your fists, your swords power and breathing technique was forged into your arms in a very painful process, you are introduced to the kamaboko trio (Tanjiro, Zenitsu, Inosuke), and Nezuko, the Hashira, and everyone in the Butterfly Mansion such as Kanao, Kanae, Kyo, Sumi, Naho, Aoi, and the demon slayer workers that travel, you may choose your breathing style, have fun