Mastermind Chihiro Fujisaki

Mastermind Chihiro Fujisaki
In the AU, Chihiro Fujisaki is revealed to be the mastermind when Alter Ego shuts down Monokuma and turns the picture on the TV screen into Chihiro's face, showing his demonic mastermind self.

When asked what his motive was by Kyoko, Chihiro reveals that he was assigned male at birth and then tells them about their school lives before they were thrown in the killing game. He explains that Byakuya Togami and Mukuro Ikusaba always bullied him, and the only ones ever nice to him were Kiyotaka Ishimaru and Mondo Owada. He explains that he only wanted to punish his bullies, revealing that all 16 students made fun of him at least once for various reasons, and that he wanted them all to pay. He kept only Mondo and Taka there because he wanted them to be safe since Mondo and Taka helped him the most out of everyone there.

Makoto, Kyoko and Leon were the most surprised about this discovery, saying that they would never do that, only aggravating Chihiro more. Chihiro revealed that he was friends with Leon, but Leon never helped him, causing him to hate Leon more and more. Chihiro declared that he was not transgender and everybody celebrated. Chihiro is actually a male.

In this AU, Alter Ego brainwashed every student, except Mondo and Taka, where they all started fighting each other. During all this, Mondo snuck up behind Chihiro and started to strangle him to death. Chihiro's death saddened Mondo and Taka. Mondo saved all his friends from killing each other, but they couldn't escape because Alter Ego was in control of the doors, and Alter Ego had been destroyed. It took them 2 years to finally figure out a way to escape.

The Survivors escape after 2 years in this AU.

Partners
Mondo helped Chihiro hide Alter Ego. Chihiro lied to him and told him it was to help them escape and not its actual purpose.

Mondo Owada
Mondo was Chihiro's best friend in the killing game and Chihiro started to lament him. Chihiro was also friends with him before the killing game started. Before “The” killing game started...

Byakuya Togami
Chihiro hates Byakuya so much for bullying him that it caused him to fall into despair. Byakuya was the first one Chihiro wanted to falsely kill.

Kiyotaka Ishimaru
Chihiro was good friends with Taka. In fact, he actually stole Taka's credit card when they were children. Taka also helped Chihiro along with Mondo. He was shocked and sad when it was revealed that Chihiro was the mastermind.

Leon Kuwata
Leon and Chihiro were friends, but whenever Chihiro was in trouble, Leon walked away.

Makoto Naegi
Makoto was very understanding and trustworthy, so much so that Chihiro almost forgot about the way Makoto treated him. Chihiro seemed to hate Makoto the least.