Do you mean only in the films or do outside the SW films count as well? Such as comics, video games, etc. I'll list them both off.
Favorite Star Wars Characters from the films:
1.) Obi-Wan Kenobi
2.) Darth Vader
3.) Mace Windu
4.) Luke Skywalker
5.) Jango Fett
Favorite Star Wars Characters in general:
1.) Galen Marek aka Starkiller (I love this character and he will forever be my favorite Star Wars character of all time!)
3.) Darth Vader
4.) General Grevious (But only from the 2003 Clone Wars animated series. He was the definition of a badass in that show. He was pretty much unstoppable. I was actually kinda disappointed with him in the Episode III and the new Clone Wars show.)
5.) Ahsoka Tano (I'm not gonna lie when I first saw Ahsoka, I thought she was gonna be annoying. I didn't think Anakin needed an apprentice and boy was I wrong. I love her optimistic personality and her willingness to help anyone she can. I was so happy to see that **SPOILERS** she came back in the new Rebels show. Now we just need to see her face off against Vader!)
And those are my picks for my Top 5 Star Wars characters!