Han Solo. Hands down. As a kid, I never wanted to be Lando Calrissian, Boba Fett (HA!) or any other character except, perhaps, Darth Vader (bad guys have the coolest toys). Han was suave, sarcastic and doesn’t take everything as seriously as everyone else (including the director) around him, making sure the proceedings don’t get too bogged down in the whole mythos part.
Someone once argued to me that the main failure in the prequels was the lack of a Han Solo character to bring things down a peg in terms of self-importance. I’ve really come to agree with him, even while continuing to enjoy those films.