The Mastermind behind it all

A boy stuck in a hospital all his life, with one perfect text cancer was cured, with one email he started a world war, and with one phone call he caused a nuclear winter. As the ashes fell around his abandoned building, his emotionless eyes stared out the window as he muttered, "hm.. that wasn't as interesting as I had hoped" before his life support finally shut down, way too late to have saved humanity. By pure chance, at that moment, hell was at full capacity, so the final souls coming in were redirected for reincarnation, as one unwavering soul sped towards a large unsuspecting planet, unaware of the dangers to come...