Well, Cid Kagenou does reveal himself at a crucial point in the manga. This reveal has significant implications for the plot and character development.
I don't have a definite answer for you. The manga might be keeping us in suspense about who Cid Kagenou will end up with. It could be a surprise twist or a character that has been hinted at throughout the series.
Well, El Cid has a basis in history. Rodrigo D铆az de Vivar was a real person, but the stories about him have likely incorporated fictional elements over time to make them more captivating.
One way they could show their love is by actively participating in fanfiction communities. They could be giving feedback to other writers, sharing their own works, and engaging in discussions about different fanfictions. This shows that they are not only interested in writing their own but also in the overall culture of fanfiction. They may also promote fanfiction in general, perhaps on social media or other platforms, to get more people interested in this form of creative writing.
Their relationship can be developed through shared adventures. For example, if they go on a quest together to retrieve a powerful artifact. During this journey, they have to rely on each other's skills. Cid's combat and strategic skills combined with Rose's knowledge of the local area or certain magic can bring them closer. They start to respect each other more, which is the first step in developing their relationship.
Well, it's really hard to tell. Fanfiction is a vast world. They could all love fanfiction that features their favorite characters from a certain franchise. It could be that they are into the fanfictions that explore different relationships between the characters in ways that the original work didn't. There are so many factors that could contribute to their love for fanfiction, like the creativity of the fanfiction writers, the themes explored, and the overall emotional impact of the stories.