I don't have enough information to say exactly who Miu Sakamoto is in this context. They could be an author, a storyteller, or someone involved in creating this 'never ending story'.
Ryoma can be seen as the laid - back prodigy. He has a natural talent for tennis but doesn't flaunt it as much as Atobe. His cool - headedness in high - pressure situations is a key characteristic. Atobe is depicted as the showy and self - assured player. He loves to put on a show during matches and has a certain elegance in his playing style. In fanfiction, their different personalities lead to a lot of clashes at first, but also to a growing understanding and connection as the story progresses.
Ryuuma Echizen and Ryuzaki Sakurano were together. There were many articles and discussions about the relationship between Ryuuma Echizen and Ryuzaki Sakurano, including the news that they were finally together. This meant that Ryuuma Echizen and Ryuzaki Sakurano had become an official couple.
Sakamoto and Kouta are likely characters that fans have created a relationship for in fanfiction. They could be original characters, or perhaps characters from an existing series that the fanfiction writer has chosen to pair up in a new and creative way.
The 'Sakamoto Days' novel is mainly about a former top - tier assassin named Sakamoto who has retired and become a fat, unassuming man. But his past catches up with him, and he gets dragged back into the dangerous world of assassins. It's full of action, interesting characters, and unique fight scenes.
Ryoma would be calm and collected as always, but with a newfound sense of responsibility. He'd be more cautious and less impulsive. Sakuno would be very gentle and motherly. She'd be full of love and patience, always there to comfort the baby. Ryoma might be a bit more reserved in showing his emotions towards the baby in public, but in private, he'd be very affectionate.
In the fanfiction, Ryoma might be jealous if he notices Sakuno paying more attention to another male character. He could be too proud to admit it at first, but his actions, like being more aggressive in tennis matches or avoiding Sakuno, would give it away. Eventually, he might confess his jealousy and feelings for her.