There are likely other characters from the First Order. For example, General Hux. His rivalry with Kylo Ren and his own ambitions within the First Order contribute to the overall plot. Also, characters from Kylo Ren's past, like his parents Han Solo and Leia Organa, are important even if they may not be as present in the novel as in other parts of the Star Wars saga, but their influence on him is still a big part of his story.
Kylo Ren's review of 'Solo: A Star Wars Story' would likely be very critical. Given his allegiance to the dark side and the nature of the story which focuses on a more light - hearted adventure of Han Solo, he might see it as a deviation from the true 'power - centric' Star Wars essence. He may not appreciate the origin story aspect as he is more interested in domination and the Sith ideology.
As of now, 'Kylo Ren A Star Wars Story' doesn't exist in a completed form. However, if it were to be made, it should start from his childhood. Ben Solo, who later became Kylo Ren, grew up in a family full of heroes. His story could show how the pressure of living up to their legacies, along with the influence of external forces like Snoke, led him astray. It might also detail his experiences in the First Order, his interactions with the Knights of Ren, and his ultimate quest for power within the dark side while still having a glimmer of the light side tugging at him.
One main theme could be the struggle between the light and dark side of the Force. Kylo Ren is constantly pulled in both directions. Another might be identity, as he grapples with his lineage and who he truly wants to be in the context of the Star Wars universe.
One common theme is redemption. Since Kylo Ren is a complex character who has walked the path of the dark side, many fanfictions explore his journey back to the light. Another theme is his struggle with identity. He is torn between being Ben Solo and Kylo Ren.
Yes. In the world of fanfiction, the sky's the limit. Writers can take the characters of Kylo Ren and Rey and develop their relationship in various ways, including a scenario where they are pregnant. This could add a whole new layer of drama and intrigue to their story, exploring how they would deal with such a situation in the context of the Star Wars universe, like how the Force might be involved in the pregnancy or how their respective factions would react.
Kylo Ren is an important part of the story. His presence brings new tensions and challenges. His internal struggle and quest for power shape the direction of the plot in significant ways. Also, his relationship with other characters, like Rey, has a major impact.
One interesting Rey and Kylo Ren fanfiction could be about an alternate universe where they team up much earlier to fight a new threat in the galaxy. This could explore their relationship in a different light, without the initial enmity.
Obviously, Kylo Ren himself would be the main character. Then, Snoke, as he played a major role in Kylo Ren's journey to the dark side. Also, Rey could be a part of it as their connection through the Force was a significant aspect in the Star Wars sequels. And of course, his parents, Han Solo and Leia Organa, as their relationship with Kylo Ren was central to his character development.
Kylo Ren would be different in a Clone Wars - set fanfiction because he'd be out of his normal time period. He'd be surrounded by different technology and a different kind of warfare. His dark side powers might seem more extreme compared to the Jedi of the Clone Wars era. Also, his modern - looking lightsaber would be quite distinct from the ones used then.