The fanfic could explore how Sasuke deals with his emotions when Naruto is sick. He might be conflicted between his old rivalry feelings and his newfound, deeper feelings for Naruto. Sasuke could also be the one to stay by Naruto's side when everyone else is busy. He'd watch over Naruto while he sleeps, and when Naruto wakes up, there could be a moment of intense eye - contact that shows the unspoken bond between them.
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.
It could be that Cleo's sickness causes her to miss out on important events in the H20 world. This would make her feel left out and sad. Her friends would need to cheer her up and keep her involved in some way. For example, they could bring the events to her bedside if she's too sick to move.
In a 'batim bendy gets sick fanfic', perhaps Bendy would have to deal with his weakened state. He might not be able to draw as well or move around the studio as freely. His friends like Boris and Alice could be worried about him and try to take care of him. They could bring him food or medicine if there are such things in their world.
One idea could be that Sasuke, despite his usually stoic nature, feels a sense of worry when he hears Naruto is sick on his birthday. He could visit Naruto and bring him some traditional Uchiha herbal medicine that he secretly prepared. This would show a soft side of Sasuke and also deepen their bond in the fanfic.
Perhaps Sasuke, being the proud Uchiha, tries to hide his concern at first. But the other villagers notice and start to nudge him towards Naruto. When he finally goes to see Naruto, he finds that Naruto is still as upbeat as ever despite being sick. This makes Sasuke respect Naruto even more, and he decides to stay with Naruto throughout his illness, and they end up having a stronger bond after Naruto recovers.
Sasuke could play a crucial role. He might use his Sharingan to detect what's wrong with Naruto more accurately. Then he could go on a mission to find a special cure.
In the fanfic, since Noelle is sick, it could be a chance for their relationship to develop further. Asta, being the energetic and kind - hearted guy he is, would probably do some silly things to cheer her up. And Noelle, in her weakened state, might let her guard down more around Asta, leading to some really sweet and tender moments between them. For example, she could share some of her insecurities with him while he holds her hand reassuringly.
In the fanfic, if Naruto gets the Jiongu, it could have a huge impact on his relationships. His friends might be a bit wary of this new power at first. But Naruto being Naruto, he would probably find a way to show them that he's still the same person. He could use the Jiongu to protect them better, like creating barriers around them during battles. Also, it could be a factor in how his enemies view him. They might see him as an even greater threat and either target him more or try to avoid him altogether.
In such a fanfic, Naruto might gain some unique abilities from the bite. Maybe it would change his chakra nature or give him a new form. It could also lead to a different relationship with the creature that bit him. For example, if it was a demon, he might have to deal with its influence in a new way compared to Sasuke.
In this fanfic, perhaps Amy's sickness could lead to her friends rallying around her. They might show different sides of their characters as they try to take care of her.