Phantom

Reine, unlike her fellows from Ratatoskr (who are most dumb and only became true experts in the most dangerous situations) is a very quiet, composed, inteliigent and mature woman compared to the rest of the female crew. Reine is a person of few words and goes straight to the point rather than discussing about minor details. Surprisingly enough, and despite her usual cold demeanor, she has proven countless times to be a very sensitive, considerate and understanding person. This is more revealed in future volumes;

When Kotori mentioned Shido was near to being suicidal in the past in Light Novel Volume 1, Reine reacted strangely to this, almost emotional. She also was noticeably angry when she saw the modifications that DEM Industries had been made on Mana's body. She also gave a similar reaction when Shido mentioned she was like a mother after she calmed other Spirits whom Natsumi made younger. When Kotori mentioned Shido was near to being suicidal in the past in Light Novel Volume 1, Reine reacted strangely to this, almost emotional. She also was noticeably angry when she saw the modifications that DEM Industries had been made on Mana's body. She also gave a similar reaction when Shido mentioned she was like a mother after she calmed other Spirits whom Natsumi made younger. Even so, most of her reactions are related to people close to her or people she met in the past. She doesn't seem to be concerned about people with minor participation like Ai, Mii and Mai. However, that doesn't mean she will abandon the civilians and victims of the Spirits and DEM. She is not only logical and intelligent but have quick thoughts and decisions, witted enough to adapt to the sudden appearance of the Yamai sisters and seamlessly integrate them into her class field trip without raising suspicions from other students and teachers, much to Shido's surprise. Most of the time, Reine is a person of great use and is good at giving advice and coaching Shido during his dates with the Spirits, even Kotori seems to take her advice well. Aside from that, Reine is a person who has deep knowledge about physics and psychology, and can easily find out what people are feeling just by standing beside them or looking straight at their faces.

Many people, including Shido, Yoshino and Kotori stated that she is like a mother, which she seems to react to in a strange way (considering she is a maternal figure to Shido Itsuka). While Reine is normally calm and collected, there are rare occasions where she shows anger. These instances are rare enough that Kotori had never seen her angry until the events of Volume 3, when Reine showed her Mana's body had been heavily modified to give her an abnormal strength at the cost of lowering her remaining lifespan to 10 years. This is due to the fact that Reine, is a fragment clone of Mio Takamiya, a person who witnessed Isaac Ray Peram Westcott killing Shinji (Shido) and kidnapped Mana only to conduct brutal human experiments in her body to turn her into a Wizard.

When disguised as Phantom, she retains her calm and analytic personality. As a person of great charisma, Reine can easily convince people to become Spirits (in a few ocassions where she ask if they want power) using their traumatic experiences as fuel for their hunger for power.

While her true intentions were considered to be a mystery at first, it was later revealed she appears to have a goal orientated mindset focused on the fulfillment of something that she describe as her wish. A wish of love and revenge. To that end, she has turned several humans into Spirits using Sephira Crystals while Mio Takamiya was turning humans into monsters using the Qlipha Crystals to purify them and then turn them into Sephirah Crystals. To do this, Phantom has shown to be willing to use several underhanded tactics, some that can be considered unethic and cruel (most of her targets were children). When she turned Kotori into a spirit, she preyed on her desire to stop being a crybaby. When she turned Miku into a spirit, she used her hatred of humanity (especially of men) and her despair for losing her voice. When she turned Origami into a Spirit, she used her desire to obtain power to defeat the Spirits who killed her parents. As a spy, Reine doesn't appear to like the codename given to her by Ratatoskr, as seen by her displeased reaction when Shido called her by it. As Phantom, appears to evaluate a person based on their potential as a future Spirit. To that end, she has been looking for talented people to turn them into Spirits, and is willing to discard people without potential to become a Spirit. Reine is unarguably a beautiful woman with pale skin. She still looks to be in her 20s, despite saying that she hasn't slept in 30 years. She has long, unkempt, pale blue hair which is tied into a right-side ponytail and blue eyes which seems to always be sleepy. Her most distinct feature is the pair of dark circles beneath her eyes. She wears a pair of glasses with a circular frame. Her height is 164 cm, and her three sizes are B95/W63/H89.

She is usually or always seen with a small blue teddy bear that fits in her breast pocket. During her duty on Fraxinus, she wears Ratatoskr's uniform, while as a Physics teacher at Shido's school, she wears a long white lab coat over a pink shirt with a rather low V-neck collar, purple miniskirt, a pair of black stockings, and a pair of blue teddy bear slippers. She also wears a small silver ring on her silver chain necklace.

When disguised as Phantom, Reine typically surrounds herself with some sort of mosaic that, while people can see and hear her, makes it impossible for people to determine her appearance or the sound of her voice. When talking with Shido after he traveled back in time, she temporarily took on the form of Rinne Sonogami, something which she described as using "another shape".