General Grievous is often a popular character. His menacing appearance and his role as a powerful military leader in the Confederacy make him an interesting focus.
Well, if the Confederacy was good, it could change the whole dynamic of the Star Wars universe. Maybe they were fighting for a just cause that was wrongly perceived. Or perhaps there was a misunderstanding that led to conflict.
You could write about a secret mission within the Confederacy. For example, a group of soldiers are sent to retrieve a powerful artifact that could turn the tide of the war. Or perhaps a story about how the Confederacy tries to form an alliance with a previously unaligned planet, and all the diplomatic intrigues that come with it.
Rey is also a popular character in fanfic. Given her relatively new addition to the Star Wars canon, fanfic writers have a lot of room to explore her origins, her growth as a Jedi, and her relationships with the other characters in the post - sequel trilogy era.
One interesting 'Star Wars Confederacy fanfiction' could be about a young Jedi who finds himself in the middle of a Confederacy plot. He has to use his wits and lightsaber skills to uncover the true intentions of the Confederacy leaders.
As far as I know, no. Given that 'confederacy worm' is not a common or mainstream concept, it's not likely that there are popular fanfic works specifically about it. There could be some small - scale, niche fan - created works, but they probably haven't gained widespread popularity.
One of the most popular characters to feature in such fanfics is Yoda. His immense power and wisdom, along with his unique way of speaking, can create some really interesting stories. Additionally, Padmé Amidala can be a great character to include. Her relationship with Anakin and her political influence in the Republic can be explored in many ways. Then there are the clone troopers in general. Each clone has his own personality, and writing about their experiences during the Clone Wars can be very engaging.
Ahsoka Tano is a very popular choice. She has a rich backstory from the Clone Wars series, and her relationship with Anakin Skywalker gives a lot of room for exploration. You could write about her solo adventures, her growth as a Jedi, or her experiences during the war.
Ahsoka Tano is often a popular character. Her journey from being Anakin Skywalker's Padawan to finding her own path makes for great fanfic material. Fans love to explore her growth, her battles, and her relationships with other characters.
Ben Tennyson is definitely one of the most popular. Since he's the main character from Ben 10, fans love to see how he'd interact with the Star Wars universe. Another popular character could be Darth Vader. His iconic presence and dark side powers make for great storylines when paired with Ben's abilities. Luke Skywalker is also popular as he represents the light side of the Force and his interactions with Ben could lead to some really positive and heroic story arcs.
Luke Skywalker often remains popular in Star Wars Earth fanfic. He can be a mentor figure to Earthlings who discover the Force. Another popular one is Darth Vader. His iconic look and complex backstory make him a great addition to stories set on Earth or with Earth elements.