They might be really surprised. Some characters could be amused by the creative scenarios fans come up with. For example, Hinata might be excited to see himself in all kinds of wild adventures in the fanfictions.
Kuroo doesn't meet his demise in the manga. The plot doesn't involve his death. He continues to play an important role and contribute to the story's development.
The characters might be a bit shy. For instance, if there are fanfictions about Tsukishima and Yamaguchi's friendship, Tsukishima might act like he doesn't care but secretly be a little flattered. Yamaguchi, on the other hand, would probably be more openly happy about it.
The main characters include Hinata Shoyo. He's a small but very energetic and determined player. Another is Kageyama Tobio, a talented setter. There's also Daichi Sawamura, the reliable team captain.
Well, usually in a 'Haikyuu Love Story', Hinata Shoyo could be one of the main characters. He is known for his energetic and passionate nature in volleyball, and his relationship with another character could be the focus of the love story.
One common theme is friendship. Their strong bond is often explored in various ways, like how they cheer each other up when one is down. Another is growth, both as volleyball players and as people.
Kageyama might also be a main character. His amazing setting skills and his complex relationship with Hinata are often explored in fanfics. In this 'boys will be boys' fanfic, their rivalry and friendship could be central to the story.
Definitely Hinata. Since Hinata idolizes the Little Giant, a fanfiction with them together could be amazing. They could have training sessions where the Little Giant passes on his skills to Hinata. Another good character to pair with the Little Giant could be Kageyama. Their different playing styles could create an interesting dynamic in the story. And of course, Daichi. As the captain, he could learn a lot from the Little Giant's leadership on the court.