Sakura would likely be devastated. She has always cared for Naruto, even if her feelings have been complex at times. Her crying shows the depth of her fear of losing him. It could make her feel guilty for not being strong enough to protect him.
Fanfictions about Naruto being neglected and nearly dying can be quite intense. Some might depict him being pushed to the brink by the lack of support from the village. For example, he could be deprived of proper training or basic necessities. However, these situations usually lead to Naruto's character growth in a different way than in the original series. He might form unexpected alliances with outcasts or find new powers within himself.
One popular 'Naruto almost dies' fanfic could be where he's facing a super powerful, new enemy that no one has seen before. This enemy has unique abilities that quickly overpower Naruto. Maybe it's a rogue ninja with the power to drain chakra at an extreme rate, leaving Naruto on the verge of death as he tries to fight back.
Well, Kabuto can be a major antagonist in such fanfictions. Since he has a vast knowledge of jutsu and was once allied with Orochimaru, he could be the one causing Naruto to almost die. He might use his medical ninjutsu knowledge to create some sort of deadly virus or poison that specifically targets Naruto's unique chakra system. Additionally, Pain is also a common one. His Rinnegan abilities give him the power to cause a great deal of destruction. In fanfictions, he could be more ruthless in his attacks on Naruto, getting him to the brink of death.
Voldemort is often involved. Since he's Harry's main enemy, he might set up elaborate plans to kill Harry. For instance, he could use a powerful artifact to lure Harry into a deadly situation.
In many 'Naruto Almost Dies' fanfictions, one plot twist could be that an unexpected ally turns out to be the one endangering Naruto. For example, a character who was thought to be on Naruto's side has been secretly working for an enemy organization all along. Another plot twist might be that Naruto's own powers backfire on him. His Nine - Tails chakra, which is usually his strength, could suddenly become uncontrollable and start to harm him instead of protecting him. And sometimes, a character from Naruto's past that was forgotten or thought to be dead resurfaces and is the cause of his near - death situation.
Writers create tension by making the danger seem real. They describe Naruto's injuries in detail, like his labored breathing, his weakening chakra flow. For example, if he's been stabbed, they might write about the pain shooting through his body. This makes the readers worry about his survival.
In this kind of fanfiction, there could be various scenarios. Maybe Tails gets into a fight with a really powerful enemy, like a new super - villain. The villain might have some sort of weapon or power that nearly defeats Tails. For example, a weapon that can disrupt his flight or his mechanical abilities.
One possible plot development could be that Sakura's tears somehow give her a newfound strength or resolve. Maybe she decides to train harder to protect Naruto in the future. For example, she could seek out a powerful teacher or a hidden jutsu to become stronger.
They exist to add more drama and tension. Hermione is a beloved character, and putting her in a life - threatening situation amps up the emotional stakes for the readers.