Itsuka Kotori

Shido's foster sister who was a human that gained the power of a Spirit. However, she isn't able to handle her Spirit powers long before she loses control and is overcome by a powerful need to destroy and kill. She was saved by Shido five years prior to the start of the main story. There is no record of how she obtained her Spirit powers, and she herself cannot remember; she does not know why both Shidou's and her own memories are vague or missing at that crucial point, though she suspects someone may have tried to erase those memories. Her Angel is Camael, a battleaxe that is capable of changing shape to a cannon that extends to her right elbow. Her destructive tendencies increase when using Camael. She temporarily takes back her powers from Shido to save him from Kurumi with her power being sealed by Shido once more later on. She has no memory of her actions when the Spirit powers overwhelm her.

She has red hair, often in twin ponytails, and her eyes are red. She displays two very different characters, bordering on split personality. When completely relaxed and peaceful, she wears white ribbons in her hair and shows an immature, spoiled character that's always clinging to her brother. When on the Fraxinus or dealing with major situations, she switches to black ribbons taking on an arrogant, superior attitude to everyone including Shidou, but nevertheless still cares deeply for her brother as shown on many occasions. She shows evidence of concealed romantic interest, such as when she declared to Mana that a foster sister is better than a full sister because full siblings can't marry, then gets flustered when she realizes she said it in front of everyone else.