No, it's not a common element in official Star Wars canon. But in fanfiction, it can be whatever the author wants it to be. So it might be common in some specific fanfics but not across the board.
In Star Wars fanfiction, 'Si' could potentially be a character's name, a made - up planet, or an abbreviation for something specific within the fan - created story. It really depends on the context of the particular fanfiction.
A very popular theme is redemption. The SI OC might have made mistakes in their own world or in the Star Wars universe and are seeking to make amends. For example, they could be trying to redeem a villain or themselves. And friendship is also a big theme. They form bonds with existing Star Wars characters, like becoming friends with a Jedi or a smuggler, which helps them on their journey.
There are fanfictions where clones are sent on secret missions that the original Star Wars story didn't cover. For example, a group of clones might be sent to an uncharted planet to retrieve an ancient artifact. This can lead to all sorts of adventures, from battling unknown creatures to uncovering secrets about the origins of the clones themselves.
In these fanfictions, character development often occurs through the self - insert's interactions. For instance, if the SI befriends Anakin Skywalker, they can influence his path towards the dark side or help him resist it. This changes the way we view Anakin's character and his development in the story.
One popular plot idea is a self - insert character becoming a Jedi and influencing the events of the Clone Wars in unexpected ways. For example, they might prevent certain battles or form alliances that weren't in the original story.
Power and corruption are common themes. The Sith are known for their lust for power, and fanfictions often explore how this drives their actions and how it can corrupt them further. For example, a Sith character might start to lose their humanity as they gain more power.
The SI could also be a love interest for Anakin. In a fanfiction, this could be a very different kind of relationship compared to what he had with Padmé. This relationship could either be a positive influence, giving Anakin more stability and a reason to stay on the light side, or it could be a source of conflict, especially if the SI has their own secrets or agendas.
One great 'Star Wars SI OC fanfic' is 'A New Path'. It has an interesting original character who gets inserted into the Star Wars universe and has to navigate the complex politics and power struggles. The character development is really well - done.
Well, a cool plot for a Star Wars Mandalorian SI fanfiction could involve the self - insert being a former Jedi in hiding. They could use their Jedi training secretly to help the Mandalorian and Grogu. Maybe they teach Grogu some new skills that are a blend of Jedi and Mandalorian ways. Also, the self - insert could have a past connection to the Sith, which adds an interesting layer of conflict as they struggle not to be drawn back to the dark side while helping the Mandalorian. Another idea is that the self - insert is an artist who uses their art to document the adventures of the Mandalorian, and in the process, their art gains some sort of magical or important significance in the Star Wars galaxy.