Tatsumi Kazehaya

Tatsumi Kazehaya is a young man with a taller than average lean build. He has neck-length mint green colored hair and purple colored eyes, as well as two moles under his left eye. Tatsumi is 177cm, or 5'9ft.

Tatsumi is apart of an idol group called ALKALOID, along with his unitmates Aira Shiratori, Mayoi Ayase, and Hiiro Amagi who is the leader of the group.

Tatsumi is well-spoken, and often makes references to the Bible when he speaks. Much of his advice is religion-based. When faced with what he perceives to be a problem, he tends to spring into action before assessing the situation, attempting to help without knowing the full story. Sometimes, he makes assumptions about these situations that turn out to be untrue, and tries to fix a problem that isn't present at all. He seems to worry quite a bit, but he tries not to let his fears hold him back. He is modest, downplaying many of his own achievements and praising everyone else. As an underachiever, he works together with the rest of ALKALOID to become the best idols that they can be.

Tatsumi has much knowledge of the idol industry and its inner workings, as he was an active solo idol before being hospitalized. Due to his hospitalization, he seems lost when it comes to technology, both the terms and the way things work often rendering him confused.

Despite being Christian, Aira tells Tatsumi that he doesn't match how he envisioned a religious person to be due to his coexisting views on science and logic. Whether Tatsumi believes in the existence of a deity or not is still up in the air, but he makes it clear that he truly believes in the power of God shaping the world in some way because of what humans do for faith, as he did.

Tatsumi has a caretaker attitude. He regularly holds confession rooms with his peers to hear out their woes. He cooks and bakes, handing out meals to people who need them. He compliments everyone around him, believing that everyone deserves to be seen for the good that they bring.

Tatsumi perceives himself as somewhat immature. Having grown up around seniors, he couldn't experience childhood in the same way as most other children. Even so, he is a dreamer with childlike fantasies of world peace, acceptance, and love. He finds that his ideals may be stupid, and adults may scold him for them, but sharing those dreams are what makes him the happiest. Ibara does not take him for an idiot with his head in the clouds, but simply a young man with pure religious faith and dreams that he wanted to witness unfold.

Tatsumi stated that becoming an idol was less of a desire and more of an obligation in order to destigmatize his Christian faith, believing that the respect he garnered from being an idol would further extend to his religion. With no personal interest in fame or fortune, he equally distributed his earnings to everyone associated with his cause. If there was one thing that he wanted out of his status, it was to find a friend who he could stand alongside as equals. He found a friend in Kaname Tojo, who was the only one who made an effort to see him rather than blindly follow him. When Kaname asked Tatsumi why he trusted him, Tatsumi admitted to him that even if he was betrayed over and over again, he would always forgive him every time. Tatsumi is self sacrificial to a extreme degree.

Tatsumi is a priest. Tatsumi can drive, but is proven to be a bad, speedy driver by his unitmates. He can cook. Tatsumi has perfect pitch. Tatsumi occasionally has severe leg pain, which is apparently psychological, as his leg tissue is healthy, causing him to have a slightly different stance.