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.
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.
First, understand the character of Cid. Think about his traits, like his charm or his sense of humor. Then, create a love interest who can match his playfulness. For example, a character who can banter with him easily. Start with a fun meeting scene between them, like at a lively party or a bustling marketplace. Develop their relationship gradually, with small moments of flirtation and shared laughter.
Since I don't know the actual story, I can't say how it begins. It could start with a chance encounter perhaps, like they meet in a marketplace or at a festival.
I'm not sure which 'CID' you specifically mean in relation to a love story with Sachin. There could be many people named Sachin. Maybe it's a very personal or fictional scenario within a specific community or story that I'm not aware of.
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.