Hideki Tojo

Japanese prime minister from 1941 to 1944, responsible for Pearl Harbor, the rape of Nanjing, the Bataan Death March, allying with the nazis, and unit 731
He tried seppuku but failed and was executed by US Marines a couple months later.
Hideki Tojo’s actions have been referred to as an ‘Asian holocaust’ as he took inspiration from the nazis and viewed the Chinese as subhuman, although Tojo employed weapons even Hitler refused to use.

Why did Hirohito bomb Pearl Harbor and invade China?

That was Hideki Tojo.