While the films tend to frame Star Wars as a two-sided conflict, TV series like The Clone Wars try to make things a bit more complicated. Insurgents, protesters, fledgling rebels, and pirates would all very much like for the rest of the galaxy to pay attention to them. Their whining rarely elevates them out of cartoons and comic books, but one major faction has pivotal role in pretty much all of the Star Wars movies of note.
From Jabba the Hutt to Unkar Plutt, the criminal element is often an unseen faction in the war for the galaxy. The Hutt Cartel is pretty much the standing... Or, uh, slithering representative throughout most of Star Wars fiction, but in the good old EU, no talking nematode came close to the influence of Prince Xizor.
Like the more mainstream Jabba, Xizor was a gangster motivated by a vendetta. Unlike Jabba, Xizor didn't waste his time worrying about vest-loving smugglers with unpaid debts. Xizor instead kept his eyes on the shiny, plastic prize: Darth Vader.
At some point prior Vader had dropped several TIE bombers' worth of high explosives on Xizor's entire gene pool as part of a government cover-up. As far as attempts at concealing war crimes go, it wasn't a very good one. The prince figured out what had happened, and made the most recognizable helmet in the galaxy -- and the head within it -- his most coveted possession.
Unfortunately for Vader, his itsy bitsy planetary bombardment had another side effect. Without family as competition Xizor skyrocketed among the ranks of the Black Sun. Prince Xizor's secret grudge wouldn't be backed only by a ponytail and an obvious lack of shame. He had the entire might of the most powerful criminal organization in the galaxy at his back. The wealth and influence afforded him was enough for most people to consider him one of the three most powerful beings in the galaxy, next to his longtime adversary and Emperor Palpatine.
Since Leia gave Jabba the ultimate sleeper hold in Return of the Jedi, Star Wars could use a replacement criminal mastermind. The Black Sun and its most ambitious president seem like fine candidates.
The idea of Darth Vader attempting to fill the void left by his presumed dead children with another, secret apprentice is juicier than a CGI pear. The first Star Wars: The Force Unleashed game was in fact filled with great character moments, and sweeping additions to the Star Wars epic mostly thanks to the surprisingly fleshed out Galen Marek.
Said secret apprentice has the distinction of being a Force user raised almost entirely in the dark who was eventually pulled to the light. Not only does Galen turn on Vader and help kick start the Rebellion, he goes full messiah and gives up his life just in the name of friendship. Given the usual Jedi track record that's like tying an entire jar of peanut butter to a slice of bread and still having it land on the other side.
Granted, much of that is undercut in The Force Unleashed's decidedly less heartfelt sequel. But, once again, the beauty of bringing in old characters is that writers could pick and choose which elements are worth keeping. The most important being Galen's interactions with Vader post-Revenge of the Sith.
We all know that Vader spent years as one un-fuck-with-able bad dude -- wonderfully illustrated in his solo comic series -- but a more personal look into the man behind the bug-eyed helmet and quilt gloves would be nice. Galen, or a character like him, could work as a wonderful microscope into the eldest Skywalker's psyche.
Of course, it'd be tough to include a character who can pull Star Destroyers out of orbit with his mind into Disney's thus far more reined-in canon. Once again, however, the beauty of giving the character a second chance would be the chance to revise certain elements of his makeup.
Not to mention it's a great excuse to do away with everything that happened in The Force Unleashed's awful sequel.