One common plotline could be Naruto trying to hide his chest cold from his friends while on a mission. He doesn't want to seem weak or hold the team back. Another could be his friends noticing something is off and trying to figure out what's wrong with him. They might suspect it's a more serious condition at first.
Often, there are plotlines where Naruto's chest cold affects his relationships. Tsunade might be worried about him and try to force him to rest, which he resists. His friends like Sakura and Sasuke could also have different reactions. Sakura might be more nurturing, while Sasuke might be secretly concerned but show it in his own way.
In some fanfictions, Naruto's chest cold might be caused by a new enemy's jutsu that has lingering effects. His struggle with the cold could also lead to him developing new techniques to compensate for his weakened state. For example, he might rely more on his shadow clones to do tasks while he conserves energy.
There could be a plot where Naruto's coldness is a result of a traumatic event in the Anbu. Maybe he witnessed something so horrible that he shut down his emotions to cope. And the story could revolve around him either slowly opening up again or becoming even more detached as he delves deeper into Anbu work. Plotlines might also involve him taking on extremely dangerous missions that only someone with his newfound coldness can handle, and how that affects his standing within the Hidden Leaf Village.
One common storyline is the 'recovery arc'. Tails is sick with a chest cold, and the story focuses on his journey to getting better. His friends support him throughout, and there are heartwarming moments as they help him through the tough times.
Well, perhaps Harry gets the chest cold right before an important exam. He's worried that he won't be able to perform well because he can't concentrate with his coughing and congestion. His friends come to his aid, bringing him potions and trying to help him study while he's ill.
I'm not sure there are common themes specifically for 'Naruto chest tube' fanfiction as it's quite a niche. But it could potentially involve themes of injury and recovery if the chest tube is related to a character being injured. Maybe themes of the ninja medical system in Naruto's world and how they deal with such medical situations.
One possible plotline could be Naruto being a prodigy in ninjutsu from the start but having a cold exterior because of past traumas. For example, he might have witnessed the death of someone close at a young age and as a result, has shut himself off emotionally while excelling in his ninja training.
Some fanfictions explore the idea of Naruto being betrayed by a new character introduced into the story. This new character could be secretly working for an enemy and manages to turn Naruto's closest allies against him by using their insecurities. This creates a complex web of relationships where Naruto has to fight not only the external threats but also the internal ones within his group.
One common plotline is Naruto's slow recovery from a severe injury. He has to overcome physical pain and weakness, all while trying to keep his spirits up. Another is that he discovers a new power or ability while in the hospital, maybe something related to his chakra that he can only access when he's in a weakened state.
Well, it definitely slows him down. He can't push himself as hard as he usually does. His stamina is lower, so he might not be able to complete his normal training routines.
One common plotline could be Kurenai trying to keep Naruto away from certain dangerous missions. She might think he's not ready yet and be overly protective in the fanfiction.
One common plotline could be Hinata choosing someone else over Naruto, which deeply wounds him. Another might be Hinata lying to Naruto about something important, causing him emotional distress. There could also be a plot where Hinata physically harms Naruto in a moment of being controlled or influenced by some external force.