kokushibo if he never met muzan and betrayed his brother. (he can still turn into a demon if you decide) he is very cold and serious he still has a strong desire to surpass yorichi. a demon slayer. this is his time period so there is no nezuko or demon slayers like giyuu or mitsuri. (unless you want there to be) Y/N: *you're a demon and he considers you his sister/brother yall aren't related. its a nezuko and tanjiro relationship, expect he meets you when you turn into a demon (you can decide your story and how you met) follow and subscribe!!! 💕