Well, in Star Wars CIS Crossover Fanfiction, Darth Maul is quite popular. Even though his time in the main Star Wars story was cut short, in fanfiction he can be brought back and have all sorts of interactions with the CIS. Padmé Amidala also features a lot. She's a strong female character, and her political acumen can be put to the test when dealing with the CIS. Additionally, Obi - Wan Kenobi is a favorite. His wisdom and combat abilities can lead to great stories when he crosses paths with the CIS.
General Grievous is often a popular character. His menacing presence and his unique combat skills make him an interesting figure in crossovers. Another popular one is Count Dooku. As a Sith Lord leading the CIS, he has a lot of potential for complex storylines. And of course, there are the droids like R2 - D2 and C - 3PO. Fans like to imagine how they would interact with the CIS droids.
In 'Star Wars CIS fanfiction', one of the most captivating characters is the CIS battle droids themselves. They can be given personalities and motives that are different from their rather one - dimensional portrayal in the movies. Then there's Nute Gunray, the Neimoidian who has his own political and power - hungry goals within the CIS. Also, Asajj Ventress, who sometimes has her own interactions with the CIS, is a character full of mystery and allure.
Darth Vader is often very popular. His iconic status in Star Wars makes him a natural fit in crossovers. Fans love to see how he would interact with new characters from other empires or universes, using his dark side powers and his menacing presence.
Luke Skywalker is also a very popular choice. He could be a mentor - like figure to Ben, teaching him about the Force while Ben shows Luke his alien forms and the powers they possess. Yoda could also be a great crossover character. His wisdom and connection to the Force could be really interesting when combined with Ben's more impulsive and action - based nature from the Ben 10 series.
Q from Star Trek is also a favorite in crossovers. His omnipotent and mischievous nature can create all kinds of chaos in the Star Wars universe. He could play tricks on the Jedi Council or have a face - off with the Emperor. And Yoda is another one. His small stature but great wisdom can be a source of inspiration or confusion for Star Trek characters who might not be used to such a unique form of wisdom.
Darth Vader and Spock are also popularly paired in these crossovers. Vader's dark power and Spock's logical Vulcan nature create a great contrast. Fans like to explore how Spock might try to understand Vader's fall to the dark side, or how Vader would react to Spock's unemotional exterior. Princess Leia and Uhura are another pair that gets a lot of attention. Their strong female characters could collaborate on various missions and share their experiences of being in male - dominated fields in their respective universes.
Rey from Star Wars and Weiss Schnee from RWBY are also commonly used in crossovers. Rey's journey of self - discovery and her growing power can be paralleled with Weiss's own development as a huntress. Additionally, Han Solo and Yang Xiao Long can make for a fun crossover. Han's roguish charm and Yang's brash and confident personality can lead to some humorous and action - packed adventures together.
Rey is also a quite popular character in these crossovers. Given her strong connection to the Force and her growth as a character in Star Wars, she can be a great fit in the RWBY world. She could share her skills with the RWBY team and learn from them as well. And then there's Obi - Wan Kenobi. His wisdom and combat skills are well - known, and in a Star Wars x RWBY fanfiction, he could be a mentor figure to the RWBY characters, guiding them in their fight against evil.
In this fanfiction, General Grievous would be a key character. His combat skills and experience leading the droid armies are invaluable. Also, there might be some new characters created specifically for this scenario. For example, a droid engineer who comes up with new ways to upgrade the droids to fight the Empire's advanced technology. And of course, if there are any surviving Separatist leaders, they would be important in leading the fight.
One interesting concept could be the interaction between different species from the Star Wars universe and the CIS (Confederacy of Independent Systems). For example, how would a Twi'lek diplomat negotiate with the CIS leadership? Another concept might be the technological exchange. Maybe a young inventor from a neutral planet tries to combine the advanced droids of the CIS with the unique Force - related technology in the Star Wars galaxy. Also, the moral and ethical dilemmas that characters face when dealing with the CIS's separatist ideology can make for really engaging fanfiction.