re: Who was/is the Greatest, Most Badass Warrior of all Time?

Depending on criteria, the problem with saying someone like Alexander the Great, Genghis Khan, or really most huge historical figures like that is that it wasn't necessarily their personal fighting prowess that made them successful. They were great military leaders for their time and tactics for sure. They were also incredibly ambitious.

The truth is that there are probably at least thousands of unknown warriors whose untold stories would equally qualify them for title of "most badass."

But to have a bit of fun I'll throw Lu Bu into the conversation. Most of what I've heard about him is from The Romance of the Three Kingdoms which is pretty much historical fiction. While the account should probably be taken with a pretty hefty amount of sodium (like a lot of history anyway), he was just a bad arse character, and he was actually based on a real person.