Well, Batman might become super protective. He could lock down the Batcave to keep Robin safe while he's sick.
Perhaps Robin's sickness could be a plot by the villains. They might have infected him with something to try and draw Batman out. So Batman has to deal with that threat while also caring for Robin.
In some fanfictions, Robin's sickness could lead to him having strange dreams or hallucinations. And Batman has to figure out if they're just part of the illness or if there's some deeper meaning, like a clue to a new villain's plan.
Maybe the other Justice League members will have to step up and take on more responsibilities while Batman is sick. They might struggle without his usual strategic mind.
Well, the plot could involve Robin's friends rallying around to take care of him. Maybe they bring him soup and keep him company while he's in bed recovering.
In the 'tohru gets sick fanfiction', perhaps her friends would be very worried about her. They might take turns to take care of her, bringing her warm soup and making sure she takes her medicine on time.
Well, in this 'ginny gets sick fanfiction', it could be that she has a mysterious illness. Her family would then be very worried. Her brother might try to find a cure or at least some medicine to make her feel better. And there could be a lot of emotional moments as everyone is concerned about her well - being. Maybe there's a special someone who is especially worried and stays up all night by her bedside.
Well, it could be that his friends have to step up and protect the city while he's sick. Gwen and Kevin might have to deal with villains on their own, and they could struggle without Ben's usual power. Also, Ben might be really frustrated because he can't use his powers as he normally does when he's ill.
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.
Well, in this fanfiction, perhaps Jazz might have a common illness like the flu. He could be bedridden, feeling weak and having a high fever. His friends might come to visit him, bringing soup and trying to cheer him up.
He might slow down the progress of the mission. His teammates would have to take extra care of him. They could either find a safe place to let him rest and recover or struggle to complete the mission while protecting the sick Naruto.
In this fanfiction, perhaps Sam's sickness is something really unique that no one has ever seen before. It could be a magical or science - fictional kind of illness. Her friends could go on a wild adventure to find a cure, traveling to strange places and meeting all kinds of interesting characters along the way.
Maybe his superpowers go haywire while he's sick. Since Max is a super in The Thundermans, getting sick might have unexpected effects on his abilities.