Okay, so after looking at it very closely, here's what I've come up with. Legacy is basically a Deconstructor Fleet for Star Wars. For example the characters mostly some kind of composite of characters seen in the films, with an extra layer of deconstruction added on top:
Cade Skywalker = Luke Skywalker, Han Solo. He combines the two staple Star Wars protagonists, the outlaw, and the Jedi chosen one. The Deconstruction comes into play in a few key areas. First he has the Han Solo apathetic view on life. However unlike Han, this isn't flat earth atheism, it's an acquired bitterness, making it all the more profound. His drug addiction shows just how seedy the life of an outlaw can be. Unlike Luke he didn't jump at the call. He spends his whole life trying to hide from it. Unlike Luke's relationship with force ghost Obi Wan, Cade openly mocks and belittles his ancestors.
Nyna Calixte = Darth Vader, Tarkin, Prequel-era Palpatine. Like Tarkin she's an utterly ruthless high ranking Imperial officer willing to commit terible actions to meet her goals, believing firmly that she's doing what's best for the galaxy. Like Prequel Palpatine, she's a Chess master, carefully trying to manipulate evens behind the scenes. Like Vader, the fact that she's Cade's Mother is a major plot twist. However, unlike Palpatine, who was always thirty steps ahead, she is actually out-maneuvered by the Sith and spends most of the series plotting against them. It could be argued that she's even more of tragic monster then Vader, as she's constantly struggling between her plans, and the safety of her son.
The roll of Leia is split between two characters. Marasiah Fel, and Gunn Yage. In the original trilogy Leia is the princess of Alderan, a world that, in her own words is "peaceful" and "has no weapons". Marasiah, on the other hand, is the heir to the Fel Empire, the ones who started the war. Gunn is the other half of Leia. The sister the hero never knew he had. She also has elements of the X-wing pilots from the original trilogy. However she is on the Imperial side. This is key for a number of reasons. The original rebel pilots all had unique personalities, and a lot of character development. Conversely, however, a lot of effort was taken to dehumanize their enemies. The TIE fighters didn't have a hyperdrive, or their own life support systems, leaving the TIEs completely reliant on their Star Destroyer. The pilots themselves didn't have faces, and where established to be clones. While the Rebel pilots all had emotional attachments to their fighters, each of which was unique due to repair and customization, where as the Imperial pilots probably never used the same ship twice. The Imperial Knights are also an Interesting concept, allowing he exploration of one of the biggest flaw in the Old Republic Era Jedi, the conflict between political loyalties and their duty to the force is something almost every character in the Imperial Knights has to come to terms with. The biggest thing however has to be the introduction of shades of grey to a setting that up until this point has always been about the conflict between the light-side and dark-side.
