Actualy the main character is Anakin because he is in every episode and his family is too because it is all about that family
There are a lot of blue characters one of them is Aayala secura who is a female jedi knight
If you are talking about that Protocol droid in all of the movies, his name is C3p0: Human Cyborg Relations!
YODA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Chewbaca holds second place..... IT IS DARTH VADER OR ANAKAN
Probably Han Solo or Luke. But Darth Vader is probably the most famous, since I had no idea Han Solo existed previously.