I want to get out of that mould that people always answer here with (Roger’s, painting man, hitler). So my answers are

• best: Mandela. What a hero to so many and a soul that seemed to just exude kindness. I wish his work would’ve spread deep in South Africa, but what he accomplished was still remarkable
• worst: pol pot. Probably not as widely cited of a dictator but this man was genuine fucking evil. A very very close second worst imo are the people that worked in Unit 731 reading about that unit can give you nightmares.