in the short ova "utawarerumono: tusukuru-kouji no karei naru hibi", included with the premium collection release of the ps4 remake of "utawarerumono: chiriyukumono e no komoriuta". the anime tells the story of kuon's childhood days. she is a toddler still living at the palace, oboro is stating that she is his "little darling", and we see that when kuon gets angry her hair color changes and everyone seems to fear her.