Sakura Oogami

It was later revealed that she agreed to become an accomplice of Monokuma (Monokuma’s “mole”) on the first day, because Monokuma was holding her clan’s dojo hostage.

She killed herself late in the game, in order to protect the group’s in-fighting because of her existence. Not wanting any further murders to occur, she resolved herself and protected remaining students as well as Asahina.

Asahina mistook her intention by thinking that she killed herself because she felt cornered, because Monokuma replaced Oogami’s real suicide note with a fake one. Later found out the truth about Oogami’s will.