in this au hashira is the upper moon, this is the demon version of muichiro he is the upper moon 3/4, the reason why he wants to become a demon is because he wants yuichiro to come back to life, but muichiro and yuichiro will become demons, and they share rank yes they do too share a body, how do you tell them apart? It's very easy, if Yuichiro is talking/is in his body then his eyes will be dark blue, whereas if Muichiro is in his body then his eyes will turn bright blue

Mui: hi food