Reincarnated in Code Geass as the Boss

After transmigrating to an anime world, he receives one ability from God:

"Soul Mask": He can become anyone he wants to be.

Want to be a ruthless mastermind? He's Aizen. Want to be a sword saint? He's Shishio. Want to be a strategist? He's Rau Le Creuset.

While everyone else clings to the protagonist, he chooses to become the final boss.

Put on armor and sweep through the underworld. Infiltrate an academy and become classmates with the future leader of the revolutionary army. Take a mecha into battle and leave elite knights questioning their lives.

The Black Knights want a revolution? He watches from behind the scenes with a cold smile. The Knights of the Round come to surround him? He charges straight at them with his sword.

"This world doesn't need a hero," he says. "It needs a boss who can bring everything to an end."

And he is the one who can become anyone.