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.
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.
Different novels may have different answers. Here are some possible answers:
In wuxia novels, the Martial Saint was usually a master of martial arts, the Poet Saint was a scholar who was good at writing poetry, and the Painting Saint was a painter.
In poetry and novels, wine saints usually referred to literati who were good at drinking and writing poems. Qu saints referred to music masters, tea saints referred to literati who were good at drinking tea leaves, and chess saints referred to people with excellent chess skills.
In wuxia novels, a grass saint was usually an expert in planting and maintaining plants, a war saint was a military expert, a word saint was a literary celebrity, and a secondary saint was a scholar or master with deep attainments in a certain field.
In Go novels, the Grass Saint and the War Saint were usually referred to as experts in Go, while the Chess Saint was referred to as a master who was proficient in Go.
Sword saints were usually referred to as experts who were famous for their swordsmanship. There might be different meanings in different novels.
I'm not sure specifically what 'cid kevi fanfic' is about as it could be a very specific or niche fanfic. It might be related to characters named Cid and Kevi, perhaps their adventures, relationships, or some unique storylines created by a fan.
In a CID fanfic of a playful love story, the characters could be in a situation where they are forced to work together closely. Maybe they are undercover at a party. They have to pretend to be a couple, and during this time, their pretend relationship starts to feel real. Their playful interactions like sharing secret glances and inside jokes make the story really engaging.