Hideki Tojo was the main impediment to peace. As prime minister he would try suicide rather than admit defeat. After cessation of hostilities he was imprisoned until his demise in 1948.

Tojo boasted that his only hobby was his work, and he customarily brought home his paperwork to work late into the night and refused to have any part in raising his children, which he viewed both as a distraction from his work and a woman's work. He had his wife do all the work of taking care of his children. A stern, humorless man, he was known for his brusque manner, his obsession with etiquette, and his coldness. Like almost all Japanese officers at the time, he routinely slapped the faces of the men under his command when giving orders. He said that face-slapping was a "means of training" men who came from families that were not part of the samurai caste and for whom bushido was not second nature.