His closest friends like Kagami would probably be very concerned. They have a strong bond on and off the court.
Well, in the 'kuroko gets sick fanfiction', perhaps his friends would take care of him. They might bring him soup and stay by his bedside to keep him company.
A new player on an opposing team could be the cause. This new player might be overly cocky and disrespectful towards Kuroko during a game. They could constantly taunt him about his lack of presence, which finally gets on Kuroko's nerves and makes him mad.
In the fanfiction, it might be someone from his own team. Maybe there's a new member who is insecure and feels that Kuroko is getting too much attention. So, in a fit of jealousy, this person does something that causes Kuroko to get hurt, like tampering with his equipment.
Sasuke would also be concerned, believe it or not. Despite their complex relationship, they are comrades and friends deep down. He might not show it outwardly as much as others, but he would be worried. And of course, Kakashi. As Naruto's teacher, he has a responsibility towards him. He would be using his wisdom to figure out a way to get Naruto back on his feet.
Well, it could be about Kuroko from a certain anime or manga obtaining the 'emperor eye' ability. This might lead to him having enhanced perception on the court in a sports - related context, like seeing opponents' moves before they happen and making better plays.
In such a fanfiction, perhaps it could start with Kuroko being targeted by a rival team who want to disrupt Seirin's plays. They might kidnap him on his way home from practice. His teammates would then start a frantic search, led by Kagami. They would scour the city, following any leads they could find. In the end, they manage to rescue Kuroko and their bond becomes even stronger through this ordeal.
Perhaps an older teacher or coach who has always had an eye on Kuroko's potential could step in as a savior. They could see the signs of bullying and use their authority to punish the bullies and provide support and guidance to Kuroko, helping him to grow stronger both on and off the court.
A possible plot for a Female Kuroko x Akashi fanfiction could be set in an alternate universe where there are no gender - based restrictions in basketball teams. Female Kuroko joins Rakuzan instead of Seirin. Akashi, as the captain, is initially skeptical but soon realizes her potential. They start training together intensively. As they do so, they begin to develop feelings for each other. However, they face opposition from some of the team members who are not used to the idea of their captain being involved with a female teammate. But through their strong bond and love for basketball, they overcome these obstacles and their relationship blossoms.
His gaming rivals are also popular. These characters can be written as intense competitors who constantly push Kuroko to improve his skills. Their back - and - forth battles in the gaming world make for exciting plot points.
Kuroko himself would be very interesting. His unique 'phantom' style of playing basketball could create some really unexpected scenarios in a crossover. For example, if he were in a crossover with a detective story, his ability to be unnoticed could be used to solve mysteries in a very unorthodox way while still having some basketball - themed elements in the story.