Character: Han Solo (although Yoda, Luke and Chewie are favorites too, Yoda's in the PT as well, so we'll give Han the nod...plus, he was my favorite as a child)
Vehicle: Millennium Falcon - its always been my favorite, played with a vintage falcon handed down to me from my cousin all the time as a kid, it was just a cool ship.
Scene: Probably either the Jedi duel, or the Bespin duel, both were amazing. I'll give the nod to the Bespin duel due to the "father" line.
Quote: Other than the one from the scene above, I'd have to say one of these:
"Do or do not, there is no try"
"No time to discuss this with the committee"
"Judge me by my size do you?"
"And I thought these things smelled bad on the outside"
Great topic, by the way