『Shidou Itsuka』

Age: 16

Height: 170 cm (5'7")

Weight: 58 kg

Blood type: A

Species: human

Affiliations: Raizen High School, Ratatoskr

Favorite quote: "If people refuse to accept you, I'll just accept you even more."

The main protagonist of the story, Shidou is a student of Raizen High School. He was adopted into the Itsuka family when he was "abandoned" by his mother. 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. Although considering trust and affection is a two-way street he probably needs to have a certain amount of affection too, or at least genuinely want to help the spirit from the bottom of his heart which he usually does even before seeking out a spirit.

Due to this power which was already known by Kotori Itsuka he was recruited—or rather forced—to join "Ratatoskr" to help and save Spirits. Instead of killing Spirits to prevent spacequake from happening, he has to seal the Spirit's powers with a kiss in order for them to co-exist with humans.

Shidou met his real sister at volume 3 which was Mana Takamiya. Shidou, Mana and Kotori can't remember much about what happened 5 years ago because a certain "Spirit/person" locked their memories away, and at that time Shidou met Origami and helped her which was the cause as of why Origami fell for Shidou.

Once the power of a Spirit is sealed within Shidou, he has the ability to use some portion of it, thus his resurrection power is from Kotori's abilities when he sealed Kotori's Spirit 5 years ago.Zougou Saeko voices his female counterpart, Itsuka Shiori.He also possesses a strong will and a friendly willingness to forgive others. He will press on to save the Spirits despite great personal risk to himself. When responding to Natsumi's comment about the trouble she caused him, he compares her actions to what he went through during all of his past attempts to help spirits and can only call her actions childish pranks: this is a girl who nearly ruined his reputation and erased all his friends and would've then erased him had she succeeded.Thus far, he has automatically used Kotori's healing powers and has learned to use Tohka's Sandalphon, and later even summon Yoshino's ice. He was, however, unable to call these powers out of his own free will until the case with Natsumi, where he finally pulled out Sandalphon intentionally. Also, due to the sheer amount of Spirit energy sealed inside of his body, Shido has been shown to possess a level of protection or immunity towards the abilities of other Spirits, being able to withstand Kurumi's City of Devouring Time with little effort, as well as being unaffected by Miku's Solo.

Should the Spirits' emotions become unstable enough, their powers will begin to return to them and leave Shido. This means he'll have to seal them again should their powers fully return to them, but usually this only results in the Spirits temporarily regaining portions of their original power; however, as shown in the cases of Kotori, and much later on Tohka, it is possible for the Spirits to take back their full powers without the need to become emotionally unstable.

Additionally, in terms of other abilities, Shido also possesses good cooking skills and, much to his own dismay, due to having to crossdress in order to interact with Miku, Shido learned how to utilize makeup on a level comparable to most girls, enough that he was the one asked to use said skills on Natsumi. His acting skills proved effective enough to deceive his schoolmates and Miku herself, who was, at the time, a serious man hater.Later on, as Shido was about to be killed by Ellen right before her very eyes, Tohka fell into deep despair and unleashed her Inverse form, going on a rampage that almost cost Shido his life. However, even when faced with Tohka's berserk state, Shido still refused to give up on saving her, ultimately bringing Tohka back to her senses with a kiss; further emphasizing the deep level of trust and affection between the two.In the end, Miku overcame her trauma and her feelings toward Shido changed. Later on, Miku declared Shidou as her boyfriend, calls him "darling," and shows her affection toward Shidou without hesitation, much to Shido's chagrin.Shidou originally lived 30 years ago, during the time of the first spacequake. Born Shinji Takamiya, he actually met the First Spirit back when she was a mere blank slate when she was summoned into the world, befriended her and gave her the name "Mio Takamiya." Unfortunately, Westcott tracked them down and mortally wounded Shidou while attempting to capture Mio, who saved his life by absorbing him into her body and carrying him in her womb. By becoming Shidou's surrogate mother, Mio recreated him as a new kind of human.