He has layered, shoulder-length, dark brown hair, with tufts a little longer. He wears a white fedora with a blue ribbon wrapped around it, although he does have other fedoras as well. His bright eyes are light brown, contrasting with light skin, normal complexion, but in the anime, he has taupe-gray eyes. He is very athletic when sports are concerned.
Personality and Interests
Reiji is known as the clown of the group, though he also has a very mature side. Among QUARTET NIGHT, he is easily the most approachable. A bit of a prankster, he enjoys pulling pranks on others such as Ranmaru, who is an easy target. He has nicknames for all of his coworkers and insists on being called "Rei-chan" in return.
He appears to give much effort into bringing QUARTET NIGHT as a group by persuading the other members to bond through various activities, as it was revealed that they usually work individually. He also admires the relationship shared by the members of ST☆RISH, and often cheers them on or remarks that he wished his group shared the same kind of bond.
He doesn't get sucked into one particular thing since he tends to go all the way. However, it said that his true feelings are usually hidden behind his smile.
Like the other Shining Idols, Reiji has an instrument; he plays the maracas.
Reiji's mother owns a bento shop and usually helps with his sister. His father left them when Reiji was very young. In All Star, it is revealed that he had a best friend named Kisaragi Aine who looked exactly like Ai, who disappeared. Aine called Reiji shortly before his disappearance, and Reiji missed the call as he was at an important audition, thus he feels guilty over it.
Reiji first appears with Mikaze Ai and Kurosaki Ranmaru while performing one of their songs (Poison Kiss) as holograms, ending with them as their human selves. Camus later appears to complete the introduction of their group, QUARTET NIGHT. Shining Saotome states that these professionals would assist STARISH in their Master Course.
Kotobuki is assigned as Ichinose Tokiya and Ittoki Otoya's senior. He calms down Ranmaru when he is challenged by Jinguji, saying that to become a universally acknowledged professional, you have to have the guts to defy your seniors. After Ranmaru leaves, Otoya comments that he is really hoping to learn a lot from Kotobuki-senpai. Kotobuki laughs when addressed this, and tells Otoya to call him Rei-Chan. Kotobuki then nicknames Otoya 'Otoyan' and proceeds to nickname Tokiya 'Toki'.
With their rooms already assigned (to STARISH's surprise), the juniors find out that the seniors have taken more than half the room, and provided them bunk beds (as did all the other seniors, excluding Camus).
Throughout the anime, Reiji's personality conflicts with the rest of his group's (QUARTET NIGHT). He, being more extroverted, while his three other members are more introverted, preferring to be alone most of the time. Seeing STARISH and how they function together, Reiji tries to get closer to his group, wanting the same friendly and energetic connection that the other group has.
Although most of his efforts seem to fail (i.e. the time he tries to get them all to go fishing, which is met with a unanimous and harsh "no" by the other three), they aren't absolutely fruitless. With Nanami's help, by the third season, they get along better, though it's clear they are not as close as STARISH is with each other. That didn't stop them from trying to prosper, however, and continue to challenge the other group, as they, too, want to be idols.