One idea could be that you insert yourself as a new apprentice to Darth Vader. You start with basic training, learning the ways of the dark side from him. Maybe you discover a hidden power within the Force that Vader is also intrigued by, and together you explore its potential.
A plot could involve inserting yourself into the story during the time Vader is hunting down Jedi. You have your own secret mission, which at first seems at odds with Vader's, but as the story unfolds, you realize your goals are intertwined. You end up helping Vader in a crucial battle against a powerful Jedi, earning his respect.
A cool concept would be a crossover with the Star Trek universe. Darth Vader's Sith ideology would clash with the Federation's principles. He might be intrigued by the advanced technology of the Star Trek world, and there could be an epic battle between the power of the Force and the technology of the future. Or perhaps he'd form an unlikely alliance with some of the more morally ambiguous characters in Star Trek.
A plot could involve Darth Vader having visions of a different future where he and Princess Leia are on the same side. These visions start to haunt him, and he begins to subtly protect her from the Emperor's wrath. In the meantime, Leia senses a change in Vader's behavior and tries to figure out if she can use this to the advantage of the Rebel Alliance. For example, she might try to convince him to turn against the Empire completely.
One idea could be the self - insert character being a long - lost apprentice of Revan. They could discover hidden Jedi teachings that Revan had left behind and use them to fight against the Sith. Another plot could involve the self - insert traveling back in time to the era of Revan and getting caught in the middle of the Jedi - Sith war, having to make choices that could change the course of history. Or perhaps the self - insert is a descendant of Revan and discovers their heritage while also uncovering a plot by the dark side to use Revan's legacy for evil.
Your self - insert character could be a spy who has infiltrated the Empire for years. In the fanfiction, you decide to defect to the Rebels after learning about some heinous plans of the Empire. You bring with you valuable information about Imperial troop movements and secret bases. This leads to a series of missions where the Rebels use your intel to strike at the Empire. Along the way, you struggle with your identity as a former Imperial and your new life with the Rebels, and form a relationship with Hera who helps you adjust to the Rebel way of life.
One idea could be that your self - insert character is an undercover agent sent to infiltrate the Inquisitors. They have to pretend to be loyal while secretly gathering information for the Rebellion. Another idea is that your character discovers a long - lost Sith artifact that the Inquisitors are also after, leading to a race against time and a battle of wits. Or maybe your character has a unique connection to one of the main Star Wars characters, like Darth Vader, and this connection causes all sorts of complications within the Inquisitor group.
To create a believable character, think about their motivation. If you're in a world with Darth Vader, your character might be motivated by a desire to gain Vader's approval and rise in the Sith ranks. Also, consider their personality. Are they more calculating like Vader or impulsive? Their interactions with other characters, especially Vader, should be based on these aspects. For example, if your character is impulsive, they might often act without thinking, which could either annoy or amuse Vader, depending on the situation.
One plot idea could be that R2D2 is captured by Darth Vader. But instead of destroying the little droid, Vader becomes curious about the information it might hold. He tries to hack into R2D2's memory, leading to a series of tense moments as R2D2 tries to protect the secrets within. Maybe R2D2 has some long - lost Jedi knowledge that Vader thinks could help him overthrow the Emperor.
One idea could be that your self - insert character is a former slave who has gained freedom and decides to build a kingdom as a safe haven for other slaves. They start small, with a hidden base on a remote planet, and gradually expand by recruiting others who share their vision. Another plot could involve your character being a fallen Jedi who wants to atone for their past mistakes by creating a kingdom based on a new form of Jedi teachings that are more inclusive. They face opposition from the traditional Jedi Order and the Sith. Or perhaps your character is a tech - savvy alien who discovers an ancient, powerful technology on a forgotten planet and uses it to build a high - tech kingdom, but has to defend it from those who want to steal the technology.
One idea could be to insert yourself as a new Jedi in training during the Clone Wars era. You could interact with famous Jedi like Obi - Wan Kenobi and Anakin Skywalker, learning the ways of the Force from them. Another is to be a smuggler in the Outer Rim, getting involved in various shady deals and encounters with bounty hunters.
A cool concept for a Sith self - insert fanfiction would be a character who was experimented on by the Sith, giving them enhanced Force abilities but also a strange connection to the light side that they constantly have to fight against. They might be seen as an outcast among the Sith because of this internal struggle. Their journey could involve trying to prove themselves to the Sith while also coming to terms with their own identity within this dark - side - dominated world.