Diamond

Diamond is the non-transgender, female sister of Azure. She always teased Azure for being transgender in childhood. She was sadly assassinated by Azure in Azure or Diamond, for winning the battle for the throne after the queen and king died. Like Azure, she was a princess, but they had a battle for the throne and Diamond won. So Diamond exiled Azure into the wilderness. Azure survived, and two years later, came with Fyrfly and assassinated Diamond, and left, leaving the palace in ruins and chaos.