Goddess of Victory
Makoto Niijima

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Makoto Niijima is the younger sister of Sae Niijima and student council president of Shujin Academy and lives a double life as a Phantom Thief.
Despite her position as student council president, Makoto is an extremely unpopular student at Shujin Academy. This is because she did nothing to stop Suguru Kamoshida's abuse, resulting in other students labeling her as an arrogant, selfish control freak who knew about the abuse but chose to ignore it because she only cared about getting a good letter of recommendation. The Phantom Thieves initially assume the same of her. In actuality, this happens because Makoto holds no real authority at Shujin, with her position merely making her a glorified tool for the principal to use however he sees fit. In reality, Makoto wanted to do something against Kamoshida, but was too afraid of the principal meddling with her college record in order to protect the P.E. teacher.
She also is not above keeping secrets from her friends both out of shame and in order to maintain her image. When Akechi reveals to the group that Sae has a Palace, Makoto admits that she knew as much, and she wanted to go there so Sae might repent, but she kept it a secret because she thought it was "too selfish of a reason." Long before this, this trait led to her hiding the true reason why she didn't stand up against Kamoshida.