Itsuka shidou

The protagonist of the story, he possesses a strange power that allows him to seal the powers of a Spirit in his body with a kiss; however, the seal will only work if the Spirit holds enough trust or affection toward him to allow it. After sealing a Spirit's powers, there will be an invisible link connecting him and the Spirit, through which a portion of the sealed power will flow back to the Spirit if said Spirit's mental state becomes unstable, and back to Shido once the Spirit's mental state restabilises. He also has the ability to recover from severe injuries which would normally be fatal. This ability is revealed in volume 4 to be due to his having sealed Kotori's power five years prior to the start of the story, and him using her healing ability each time he gets injured. Later in the series, he discovers he can also use the other powers of the Spirits that he has sealed, but he can only use the powers for a short time as they would quickly drain his energy.

Abandoned by his birth mother, he lives with his foster sister Kotori. He has blue hair and brown eyes, and is in his second year in Raizen High School, class 2-4. He was in despair for a time after being abandoned and subsequently adopted, which made him sensitive to similar feelings from others and wanting to bring them out of it, fuelling his desire to save the Spirits. He meets his real sister Mana Takamiya later in volume 3. In volume 7 Westcott briefly addresses him as Takamiya before switching back to Itsuka.

Tohka Yatogami (夜刀神 十香 Yatogami Tōka^?)

Voiced by: Marina Inoue

She is the first Spirit saved by Shido. She transfers into his class at the end of the first volume. Shido named her for the date of their first meeting, the 10th (though one kanji is different, the tenth day of a month is pronounced as Tohka). Reine later added the Yatogami surname for her. She has long dark purple hair and purple eyes. She is ignorant of the ways of the world, but nevertheless has a normal sense of embarrassment. She seems to have strong feelings for Shido, which she is shown to be unable to understand when she gets jealous after seeing Shido accidentally kiss Yoshino. However on learning that Yoshino is a Spirit like herself she decides to support Shido in his cause to save the other Spirits such as Kurumi, even actively participating in battles at times.

She gets captured by DEM Industries at the end of volume 6, and on seeing Shido ambushed and is about to be killed by Ellen, she is filled with such despair that she transforms and goes on a rampage, attacking everyone in sight including Shido. However he manages to kiss her to bring her back. Westcott calls her transformed state the Demon King, adding that this transformed state is the actual form of Spirits like her in the bordering dimension that they come from before manifesting in this world.

Her Angel is Sandalphon, which takes the form of a throne and doubles as the scabbard of her main weapon, a broadsword, although at times it seems as though she can do just as much damage with or without it, using her hands to project force fields and seemingly manipulate wind currents in order to slice through inanimate objects with ease. Her Astral Dress, Adonai Melek, consists of a purple ballgown. When she transforms her Angel changes to Nehemah, a stronger version of Sandalphon, and her Astral Dress becomes darker in colour and more revealing. Her AST codename is Princess.