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Kotori Itsuka (五河 琴里)Age: 14
Birthday: August 3
Height: 145 cm
Blood Type: AB
Eye color: red
Hair color: red
Affiliation: Ratatoskr (Commander)
Occupation: Middle School Student, Fraxinus Commander
Favorite candy: Lollipop
Likes: bath bomb, dating sim
Dislikes: horror stuffs
Favorite quote: "Let our date battle begin."
Kotori Itsuka is one of the main heroines in Date A Live series. She is Shidou's foster sister. 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 ribbon depicts the Imouto Mode which makes her show love for her brother. The black ribbon depicts the Commander Mode which shows her tsundere sadistic bossy nature.
Kotori as a commander of Ratatoskr, would know certain information that is only selective Ratatoskr members would know, while the rest would not.
She is a middle school girl with twin-tails. She uses white ribbons while in 'sister mode'. Also, while in 'sister mode', she is not often seen wearing too much clothing that has red. In "commander mode," she uses black ribbons. She also wears a red coat, black tie with red sidelines, a red skirt with white cloth-like sticking out and a pair of black boots. The most noticeable part of her appearance falls under how she's constantly occupied with a lollipop in her mouth.
Kotori has three different personalities depending on the situation at hand. As a human, her personality changes according to the color of the ribbons she's wearing: while wearing white ribbons she is that of her "weak self," a delicate little sister who is very dependent upon her big brother; and when wearing black ribbons, 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.
In her spirit form, Kotori acts the same as her ribbons' current color indicates. But if she stays in her spirit form for too long, her third, "Spirit personality," takes over and she becomes an aggressive and merciless killing machine, who only cares about battling enemies to death. It could be said that battling strong opponents (and utterly destroying them) is her only interest.
In all three cases, Kotori seems to have a "S" side. Also, her deep feelings for Shido are always present, regardless of her current personality and, furthermore, they even help her remember who she truly is, no matter what the situation is: Shido's little sister.
Kotori Itsuka is born as a human and still is a human per se; however, she receives the powers of a Spirit during an incident five years before the main story of the novels started. Her powers are centered on the manipulation of flames that erupt from her body and can be used in close or ranged combat.
In her Spirit form, Kotori's clothes change into her Astral Dress Elohim Gibor, which resembles a goddess's robes from Japanese folklore, with a revealing neckline, a translucent sash, and black ribbons tied around a pair of horns. Her angel Camael comes in the form of a large red halberd, but can be dismantled into Megiddo, a cannon powered by Kotori's own flames. Megiddo fires powerful energy beams that can overwhelm even the defenses of other Spirits. Kotori also has a powerful regeneration ability, which Shido uses/borrows on many occasions when he is trying to make spirits fall for him. Basically, it is an ability that protects the user from certain death as long as the user has enough "mana." It also reverses all physical damage done on the person as if it never happened but only covers the recipient's body.
The nature of Kotori's powers makes her prone to losing control over the urge of defeating another Spirit, and has caused widespread damage during the two times it was unleashed. For this reason, Kotori sees her Spirit powers as a last resort that she only chooses to use when desperate times come.
Shidou Itsuka is Kotori's adopted older brother. Her love for her brother has been shown many times; however, she treats her brother lowly when she is in commander mode, but teases him when in sister mode.
Kotori developed her commander mode persona when Shido gave her her black ribbons and made her promise to be strong when wearing them, since without them she proved to be quite a crybaby. However, when she is wearing her white ribbons, she returns to her persona as his younger sister, which proves to be her truer self. A lot of Shido's peers actually find it strange how close they are. According to the Fraxinus' machines, her affection points for Shido neither rose nor fell during their date to seal her powers: because the said points were already maxed out the entire time. She can be something of a Tsundere towards him, as well as a little teasing and sadistic in commander mode.
Reine Murasame: The most reliable person that Kotori depends on when she needs to ask for advice.
Kyouhei Kannazuki: Kotori treats Kyouhei poorly due to his antics and ignores him most of the time. However, she trusted him to command Fraxinus when she was not present.
Mana Takamiya: They are both rivals as being sisters to Shido; however, after Mana defected from DEM, their relationship has improved. After Mana found out that Kotori was a member of Ratatoskr and that she'd pulled Shido into the group, she berated Kotori for it, noting that she failed as a sister for getting Shido involved with something as dangerous as the Spirits without even a weapon to defend himself. Mana later prevented a hypnotized Kotori from killing Shido and brought her back to her senses, a thing Kotori is extremely thankful for. They appear to acknowledge each other as sisters, or at least Shido's sisters, and care for each other, with Kotori even begging Mana to get treatment for her body.
Fraxinus's Crew: She treats them all fairly as the commander. It's noted by her that she sees most of her crew as family, and has memorize the names and ranks of every single member of it, even the ones she has never had any direct contact with whatsoever.
(Source: Date A Live Wikia)