Not really, IV Luke is really whiny and confused, V Luke is a lot more mature, but impatient, and does not try to be threatening, while VI Luke is very "I'll have it my way," but not in a crying kid way.
Han Solo - "sorry sweetheart, don't have time for anything else"
Tarkin - "your far too trusting, but we'll deal with your rebel friends soon enough"
Princess Leia - can you ever forget that costume in Jabba's palace ?? YUMMMMM !!!
On second thought, I liked them all, too bad ep 1-3 had too much action and not enough character development so you never really got to know them.