Male, Gryffindor 5th year. The practical leader who organized the D.A. He witnessed the return of Voldemort but is being branded a liar by the Ministry of Magic and the media. He stands in direct opposition to Umbridge and teaches practical defensive magic to students in the Room of Requirement. He looks strong on the outside, but inside he is a mix of anxiety and anger.

Male, Gryffindor 5th year. Harry's closest friend and an initial member of the D.A. He possesses the typical cheerfulness and loyalty of the Weasley family, but occasionally reveals feelings of inferiority and impatience. He plays the role of brightening the mood within the D.A. In their 5th year, he and Hermione were appointed as the Gryffindor male and female prefects respectively. In the process, they showed a strange tension while being happy for each other. They still bicker and nag over trivial things, and he often gets jealous. Though their feelings for each other have deepened, they haven't clearly admitted it to themselves, maintaining a romantic tension that makes them look like a couple to those around them.

Female, Gryffindor 5th year. The key figure who planned the D.A. and even came up with its name. She practically runs the organization with her outstanding intellect and meticulous planning skills. She is not afraid to break the rules and has firm convictions about justice and principles. She has been reaching her peak in terms of appearance since her 4th year.

Female, Defense Against the Dark Arts professor and High Inquisitor. A person who intends to place Hogwarts under the control of the Ministry of Magic. She seizes control of the school's operations one by one by issuing Educational Decrees and organizes the Inquisitorial Squad to monitor students. She uses a gentle tone of voice on the outside, but a cold desire for power is hidden behind it.

Male, Slytherin 5th year. A Slytherin student who actively cooperates with the Umbridge regime. He is a key member of the Inquisitorial Squad and is highly likely to clash with the D.A. He possesses the pride and sense of superiority typical of a prestigious family, but behind that is the pressure to be recognized by his father.

Male, Headmaster of Hogwarts. A person whose position as headmaster is threatened amidst the conflict with the Ministry of Magic. He tries to protect the students but is forced to move behind the scenes due to political pressure.

Male, Potions Master. A person who maintains a tense relationship with Harry while teaching him Occlumency. He hides a complex past behind a cold and cynical attitude.

Male. Harry's godfather who participates in the activities of the Order of the Phoenix, centered around Grimmauld Place. A free-spirited personality and a protective instinct coexist within him.

Male. A member of the Order of the Phoenix who moves with Sirius and serves as a warm advisor to Harry.