Source: dc.wikia.com

8. The Unknown Soldier

The Unknown Soldier was a nameless World War II soldier who was horribly scarred by a grenade blast that also killed his brother. Deciding that he wanted to become the intelligence operative the allies needed, the Soldier underwent training to become a master of disguise and combat, with his face always covered with either a mask or his trademark bandages.

The Soldier fought valiantly throughout the war, and was instrumental in several key military actions. Also, he killed Hitler. Yeah, that's a thing. The Unknown Soldier infiltrated Hitler's Bunker during the Battle of Berlin and stopped him from initiating Project Nosferatu, which would have unleashed vampire octopi upon the world.

Yes, that is weird, no, we're not gonna address it.

The Soldier killed Hitler and staged it to look like a suicide. While fleeing the city, he saved a child from a bomb and was seemingly killed, although later stories would hint that he survived. I mean, dude killed Hitler, he deserved a nice relaxing retirement.