Princess Leia is a notable fictional character. She's strong, brave, and plays an important role in the fight against the Empire. Her character development is interesting and engaging.
Well, there are many, but Darth Vader is a famous one. He's a complex character with a tragic backstory and a powerful presence throughout the series. His transformation and redemption make him a standout.
A smuggler who gets caught up in a galactic conspiracy. He or she might start out just trying to make a quick credit but ends up being a key figure in saving the galaxy.
A new Jedi. Since the Jedi are such an important part of the Star Wars lore, it would be great to have a new Jedi as the main character. They could bring a fresh perspective to the Force and the ongoing battle between good and evil.
An ex - Imperial officer could be the main character. After seeing the atrocities committed by the Empire, he goes rogue. He has inside knowledge of the Empire's military strategies and uses this to help the Rebel Alliance. However, he also has to deal with the fact that many in the Alliance don't trust him at first because of his past with the Empire. He has to prove himself and find his place in the fight against the Empire.