Jerrie Cobb. Her details and history just ooze with profound accomplishment and yet those same details are equally void of hints of narcissism on any level. She just seems like one the most amazing people.
Oh man. There's way too many to pick. But... if I just go with the one historical figure that I'm most fan-boy'ish about and have always sort of idolized: Nikola Tesla.
Why? It's hard to put in words, but I've just always found his story and his ideas fascinating, and he seems like a really interesting character. I would love to have a chance to sit down and talk with him.