Kuroboro

After Oboro's death, he becomes a must covered nomu known as Kurogiri with no memories of his past. After learning of his past life, the mist disappears revealing his body but he looks different now, with light purple hair and greyish skin with yellow eyes. He goes by Kuroboro in this form. (story) You are Dai Shirakumo, Oboro's older sister. You find him sitting by a puddle and you wonder who he is.