Sasuke would also be deeply affected. He might show his concern in a more reserved way compared to Naruto. He could be seen as being more determined to find a solution, using his skills and knowledge to try and save Sakura. He might even feel a sense of guilt if he thinks he could have prevented it in some way.
He would probably be quite amused by some of his past antics. For example, his constant pranks on Iruka-sensei. But at the same time, he'd also see the pain he carried from not having his parents and realize how that influenced his actions. He might react with a bit of regret for some of the stupid things he did out of loneliness, but also be glad that those experiences made him who he is today.
Typically, bottom Kageyama fanfics often focus on his more vulnerable side. They might show him relying on others more, like his teammates. For example, in some fanfics, he might open up emotionally to Hinata in a way that shows his softer side. His reactions to different situations can also be a big part of it, such as how he copes with stress or pressure in a more emotional way compared to his usual tough exterior in the anime.
There's also 'Kageyama - Hinata: Partners in Growth'. This one focuses on how they grow not only as volleyball players but also as individuals. It explores their insecurities and how they overcome them together. It's a story that shows their deep bond and mutual respect for each other.
In the manga, Hinata doesn't outright beat Kageyama. Their relationship is more about mutual growth and competition rather than one consistently defeating the other. Both characters have their strengths and weaknesses, and the story focuses on their development together on the volleyball court.
Kageyama stays with Karasuno in the manga. His character development and contributions to the team continue without him leaving. The bond he forms with his teammates keeps him committed to the club.
Kageyama and Hinata do not date in the manga. Their focus is on improving their volleyball skills and achieving success on the court. Their bond is more of a strong partnership and mutual respect within the sport.