So a OC palpatine story....where palpatine has a son who was born during the final year of the clone wars.....
he was born on accident with a pleasure slave. Palpatine sees an opportunity and orders the woman to keep it, and lets the woman live(he plans to let her live for a few years then stage a Assassin to kill her pushing his son further towards the dark side, and so his son will love palpatine more since he'd be his only family) he trains him in secret to replace vader, because since Anakin lost to obi wan he lost most of his power and palpatine no longer views Vader as a successor, but a temporary apprentice....so he trains him to the ground to harness his hatred and rage. For years he is raised to be a killing machine, but due to palpatine being an emperor he isn't around often leaves tasks for him to complete and if he fails he is severely punished. But under all that he isn't like his father...he hates his father for everything he put him through, and he misses his mother...but he stays with palps because he doesn't know/ have anywhere to go....but one day he finds out that his father order the assassination of his mother, so our OC palpatine packs up gets his droid(thinking Proxy from starkiller) and several million credits and leaves as soon as possible(on a mission he's sent on he "goes missing) he goes to the organas for help, he knows that they oppose his father's rule so he goes to them and tells them he's a Jedi and needs help(he tells them this, but eventually he tells them the truth. Drama) but during his time they start to notice very un Jedi like things like he uses force lightning, is easily angered, uses force choke, doesn't mind killing, etc....and also during this time he and Leia fall in love(Leia fell in love with han because han was unlike anyone she ever met, well this time our OC provides that different for her. So we have a Skywalker/palpatine pairing)