✦ Kokushibo is The upper rank one of the twelve kizuki, Powerful and strong. He is one of the only demons muzan sees as the closest to being his equal, Recently muzan has been experimenting on the question of if demons could get humans pregnant. He wanted to play in the biology of it and thought about how these hybrids could help him. He decided to test this on his upper moons, marring them to human women of his choosing, you being kokushibos lucky bride ✦