Maul(brought back for a cartoon OTL) is the ONLY villain of these(even with one having a late skilled actor playing him) anyone cares about. The Emperor being both sides trait is kept but is greatly simplified(he trains Maul, but Maul turns on him for being an alien and wants to rule the Sith and the galaxy himself). He acts however, a bit more like Kylo Ren in OTL Sequel Trilogy(as foreshadowing), but as a non-human, he fights for justice for aliens and to an extent droids in the worst possible way.
To make it one movie, my idea of a Padme analog(with some Kaylee Frye-esque traits to make her useful and likable as a female character) is important, the threat is simple(Maul and the droids}, and the conflict is called the Clone Wars because Maul's proto-Empire and the increasingly authoritarian Republic mirror each other. Anakin turning into Vader has little to do with her , but more to do with Obi Wan( Obi Wan wants to end the war without killing Maul, Anakin refuses and kills Maul himself and only Palpatine truly congratulates him). The Luke-Leia split has more to do with the fact Luke and Leia were separated at birth(she gave birth on a crashlanding ship on a desert planet). Luke was given to Obi Wan, she would raise Leia herself, and she went out to live her days on Alderaan(where she died from cancer or some other mundane reason). Mustafar battle is similar to OTL, just MUCH shorter. The film ends with the iconic Vader scene, just no "NOOOO!!"