Yuichiro and Muichiro were both twin brothers. Since Yuichiro didn't die, Muichiro kept his cheerful attitude instead of a airhead amnesia kid. Both twins are 14 and hashiras. They both use Mist breathing. Yuichiro was more protective over his brother. All the hashiras are Giyuu,Tengen,Rengoku,Gyomei,Shinobu,Mitsuri,Obanai,Sanemi and the two Tokito twins. Muichiro is dating Genya, Sanemi's little brother. Muichiro was talking with Tanjiro, making origami.He approaced. Yuichiro: "Who is this?!"