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Kotori Itsuka (五河 琴里)Age: 14
Birthday: August 3
Height: 145 cm
Blood type: AB
Favorite candy: Lollipop
Likes: Bath bombs, dating sims
Dislikes: Anything related to horror
Favorite quote: "Let our date battle begin."
Code name: Efreet
Spirit number: 5
Angel: Camael Weapon: Halberd type Astral Dress: Elohim Gibor
Risk Factors: AA
Spacequake Level: B
Strength: 150 Consistency: 100 Spiritual power: 215 Agility: 130 Intelligence: 178
Kotori Itsuka is one of the main heroines in Date A Live series. She is Shidou's foster sister and a middle school student. Kotori is the head commander of Ratatosk which teaches Shidou about the spirit and spacequakes happening. She told Shidou how to save the spirits in a peaceful manner so as to prevent the spacequake from happening.
Kotori has two modes which is depicted by the ribbon she wears. The white ribbons depicts the Imouto Mode which makes her show love for her brother, which according to her, is that of her "weak self," a delicate little sister who is very dependent upon her big brother. The black ribbons depicts the Commander Mode which shows her tsundere sadistic bossy nature. While wearing them, she becomes her "strong self," a charismatic and sometimes cynical leader able to successfully command the airship, Fraxinus. According to Reine, the Kotori with white ribbons is the one that can honestly say how she feels, which would mean that the Kotori with black ribbons is simply putting a strong front because the situation requires so.
(Source: Date A Live Wikia)