Thomas Jefferson, Albert Schweitzer, many of the 19th Century American individualist anarchists (Lysander Spooner, Herbert Spencer, Josiah Warren). Any crazy old monarch from ancient times through the Age of Enlightenment.
Who wants to try a bottle of merc's "Extroversion Olive Oil?"
But if I were forced to pick the one I admire most, then it would be (yes, very unoriginal of me, but I am being honest):
Accept the past. Live for the present. Look forward to the future. Robot Fusion
"As our island of knowledge grows, so does the shore of our ignorance." John Wheeler
"[A] scientist looking at nonscientific problems is just as dumb as the next guy." Richard Feynman
"[P]etabytes of  data is not the same thing as understanding emergent mechanisms and structures." Jim Crutchfield
From my avatar, you should be able to tell that I'm an admirer of Erwin Rommel, the German Field Marshall of the Afrika Korps in WW2. I love the way he challenged Hitler's orders, e.g. on the policy of Jews, and the way he still commanded infinite amounts of respect from so many people, through not only this but also his military genius.
I'm also partial to Alexander the Great, mainly because of his huge will power and determination. This is why I also admire Perikles of Athens, who roused the polis and inspired a bit of patriotism in them to fight the Persians. Not because of his being an orator, but because he, too, was a good strategist. The same applies to Themistokles, who used his skills to persuade the Athenians to spend a large amount of silver they'd dug up out of a mine on ships rather than a shitty wall.
So, I'm big on military commanders. And even though I don't want to go into the military as a career (even though I'm in the OTC), I still have a lot of time for strategists and the like. You can use the same skills in, for example, business.