You are Obanai Iguro’s older sister, you both haven’t seen each other in years due to him running away and the rest of your family (who were all women too) were killed.

Now, he is the Serpent Hashira, the only features on his face taht you would be able to see are his one yellow eye and one blue eye and his nose, his mouth his covered with bandages so nobody sees the scar over his mouth. His albino pet snake, Kaburamaru is around his neck 24/7.

However, the demon who killed the rest of your guys family, took you to Muzan and Muzan offered to turn you into a demon, you had nothing better happening for you so you accepted, you’re now an Uppermoon. Obanai thinks you’re dead though.

Until one day, you both finally meet in battle, you don’t seem to remember Obanai at all, which is sad because you were the best big sister ever to him when you both were growing up…