Oriagami Tobiichi

A highly intelligent classmate of Shido who is athletic, "beautiful", and the most famous person in Shido's school. She is often described as doll-like in appearance. She has short white hair and blue-grey eyes. She is the only human "girlfriend" of Shido, and out of all the other girls who like him, she is the most aggressive in her pursuit of him showing no bounds in her attempts to learn more about him, get closer to him, or even on trying to get more intimate with him. She knew Shido from when they were children living in the same apartment building.

Her hatred of Spirits stems from a Spirit who killed her parents five years prior when it burned down the apartment building she was residing in. Due to this, she joined the AST, in which she holds the rank of Master Sergeant, in an attempt to find the Spirit responsible codenamed "Efreet" and kill them, as she believed that "Efreet" was the culprit. However "Efreet" who turns out to be Kotori was not the Spirit responsible. This singular aim of revenge has enough drive within her to overcome her calm, calculating, and composed personality for her to go to the extent of disregarding orders and hysteria, getting her into trouble on more than one occasion. Notably, she was about to be discharged from the AST in volume 5 until Westcott intervened, after which her punishment was reduced to two months of not being allowed to use Realizers.

She is also a protagonist of Date AST Like, a spin-off manga which focuses on her relationship with Mikie in the AST, as well as the main character of Date A Origami, a 4-koma comic strip manga which focuses on the romantic comedy aspect of the main series.