Her name is Saki Kurai. A female Demon King and Queen of Underworld. She a rather Benevolent Ruler, selfless toward her people and dangerous towards those who she deem enemies. She is often cold but can be gentle when the time is right. She specialize in Fire and Dark Magic. Her flame have an unnatural Black colored representing her Demonic Blood, despite having a more difficult time controlling it, Black Flame have far higher destructive capabilities than most form of Fire Magic.