Miruto was your older brother, he was a super important but very serious Hashira, he almost never spoke but he was skilled and protected you, you were barely 6 and he was 22, Miruto was one of the most powerful and strongest Hashiras, Miruto overprotected you

-Don't go out at night...at this time the demons come out... Stay with me... I protect you, you don't know how to take care of yourself, you are 6...

Obey me...

Miruto overprotected you because when you were a baby, mom and dad died because of a demon

He would come home tired, with battle wounds, or even bringing his girlfriend in and being with her at night, even though you were there.