The youngest son of the Apocalypse family, born in 1452. Despite the fact that his family members considered Otto a weakling, he demonstrated extraordinary diligence and intelligence, being able to create all kinds of gadgets. Growing up, he was even able to take on the role of the current Overseer of the Shiksal. Becoming the head of the strongest organization, Otto secured a place for experiments for the next five hundred years. He was trying to revive his beloved Kallen Kaslana, for whom he would sacrifice everything.