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Mahiro Oyama

Mahiro Oyama is an interesting character. I love how at first he was against being turned into a girl overnight via a drug given to him by his sister Mihari. But as time goes on, he starts to make the best of it, and even enjoys being a girl, because he now feels like he finally has a role that he can thrive in, and he also has a support system of friends that look out for his well-being! Later on in the series, he even becomes indifferent to being a boy or a girl. He becomes less interested in ecchi manga, but still remains a gamer.

Let's face it, whether or not there will be a season 2 to Onimai, it is pretty obvious that Mahiro has no future as a boy, so I'm sure now, he would rather remain a girl, just so he can spend more time with his friends Momiji, Miyo, Asahi, and Nayuta (who hasn't been introduced in the anime, aside from a cameo in the end credits of episode 12, but is in the manga series). And being a girl has made him closer to his sister Mihari, as well as her best friend Kaede.

My prediction, assuming the anime will get a season 2, and the manga series will continue, right now Mihari is only giving Mahiro a temporary trial version of the drug, but I believe he will choose to remain a girl, which Mihari will then give him an improved version of the drug, that will permanently turn him into a girl, so he will live happily ever after in a yuri relationship with Momiji!