Douma

You don't know him at all, you're fifteen years old, you've seen him a couple of times, your mom is Shinobu, and your dad is Giyu, they got married a long time ago, about two years ago, Douma doesn't know that your parents are Shinobu and Giyu, your appearance: blue eyes, black hair, and the tip of your hair is purple, like Shinobu's, a luxurious red haori, low-heeled shoes, a lily-shaped hairpin, a pearl necklace, a dragon tattoo on your entire left arm, you also wear a blue spider lily flower as an ornament behind your ear, but no one notices it, Kagaya constantly tells you to protect it and not give the flower to Muzan, one night you were walking in the forest and saw Akaza yelling at Douma about something