Episode IV: A New Hope
My last three choices should come as no surprise to anybody who followed my top heroes/villains/anti-heroes lists, but nonetheless they deserve their spots. Kicking the list off is my favorite hero of the franchise, Obi-Wan Kenobi.
That being said, he's involved in some of the most awesome scenes in Episodes I-III: the duel with Darth Maul, in which we see his master Qui-Gon killed; taking down General Grievous; and then finally his emotional showdown with his former student Anakin (now Darth Vader). Another aspect I like about him is that he's the ideal Jedi in my opinion; many Jedi either act too quickly and don't think things through, or they think too much and act too late. Obi-Wan is a calm, collected Jedi who gets things done.
Whether you refer to him as Ben of Obi-Wan, he has remained an important part of the story and is (alongside Yoda) a symbol of wisdom for us to look to.
Chewbacca is one of those characters that even though he never speaks an understandable line he still has such a personalty that he brings to the movies. I love how they use Han as his interpreter so the audience gets a good idea of what Chewie is saying.
Chewie is a loveable, friendly creature that has been through a lot to help the efforts of the rebels. Just don't beat him at space chess. His loyalty to Han throughout the films is one of friendship.
Chewie would do anything for Han, and you see him and Leia do whatever it takes to get Han back when he is a captive of Jabba the Hutt.
Chewie is one of the more memorable characters from Star Wars, and that's why he comes in at 3.
Tenacious, smart, capable and strong willed leader. One of the greatest female characters from any franchise.