I'll divide them in to classes.
Class 1: What other people tell me.
Sherlock Holmes, Dr. House, Tony Stark, Star Trek TNG's Q (not to be confused with 007's Q), Commander Data, Peter O'Toole's TE Lawrence, Ash from Alien, Dr. Emmet Brown, Downton Abbey's Violet (random, yes?)
These were results collected over the years. What I find entertaining is that they are typically either Androids, Mad Scientists, and generally condescending jerks.
Class 2: My Choices
From Dostoevksy: The Dreamer of "White Nights" who dreams of romance so vividly that he never truly finds it. Razumikhin of Crime and Punishment who is a principled and well-socialized for Roskolnikov. On the flipside I identified with Rogozhin in The Idiot more than any of the other characters and he was most definitely the darker of the two foiled protagonists.
Ender from Orson Scott Card's famous series. He came, he saw, he conquered, and he walked into a different lifestyle thereafter. More or less what I am trying to do with my life.
As a kid...Jack the Giant Killer...always Jack the Giant Killer. Look out world.
Gandalf too. I wouldn't claim his mantle of wisdom or intelligence, but I can identify with his attempt to empower the common people in a fight against tyranny in which it often seems hopeless.
That and I am quoted by close friends as saying that politics should be put in context as a War of the Ring, not a Game of Thrones. Hardyharhar