Is it alright if our hero is already dead? If so, here goes:
My hero is Hannibal Barca, the general of Carthage during the Second Punic War against Rome. I admire just about everything about Hannibal. First off, he was brilliant. An absolute genius. More than anyone else, he represents to me the power of logic over brawn, as evidenced by his landslide victories over the most powerful foe the world had seen against horrible odds. To me it proves that thought can have an immeasurable effect on outcomes.
Second point, his character. He didn't put himself above his troops, he never lost his composure. He was determined to win the war, even when his own country basically abondoned him and left him to die. Even more, he commanded troops from a lot of different cultures and languages, all of whom would follow him to the ends of the earth. He brought out the unique strengths in these troops as well.
After the war, he was put in charge of Carthage, and brought down their massive debt to Rome, which nobody thought would happen. He never let power go to his head, and didn't stand for corruption.
I could literally ramble on for ages about the guy. He possessed extremely admirable traits, and those are the sorts of things one looks for in a hero I think.