There could be fear as well. Seeing Naruto injured, Sakura might be afraid of losing him. This fear could drive her actions in the fanfiction, whether it's in finding a cure for his injuries or in taking revenge on those who hurt him. It would also add more depth to their relationship as she grapples with these complex emotions.
Vivi would likely feel a great deal of guilt. She might blame herself for putting Luffy in harm's way. After all, he got hurt because of her. This guilt could drive her to be more proactive in helping him recover.
Hotch would feel a great sense of responsibility. He's the leader, and Reid getting hurt might make him question his decisions that led to the situation. He'd be very protective and focused on getting Reid back to full health.
Twilight Sparkle would likely be extremely worried. Since she raised Spike, she would feel a deep sense of guilt, as if she failed to protect him. She might even blame herself for putting Spike in a situation where he could get hurt in the first place. She would probably rush to find a way to heal him, using all of her magic knowledge.
They would feel a mix of guilt and anger. Guilt because they might think they could have prevented his injury. Anger towards the person or situation that caused it. Eric would be especially emotional, as he and Ryan are close friends. They would all rally around Ryan, and this would strengthen their bond as a team.
There would be a great deal of gratitude from Iris towards Shinra. She would likely feel guilty that he got hurt because of her. Shinra, on the other hand, might feel a sense of fulfillment in protecting her, despite the pain.
The people closest to Naruto, like Hinata, would be completely devastated. She would be by his side, crying and feeling like her world is falling apart. The thought of losing Naruto, the man she loves, would be almost too much to bear.
The other characters would likely be very worried. Stella might be especially emotional as she's one of Flora's closest friends. She could be seen crying and constantly hovering around Flora, trying to make her feel better. Musa would probably be quiet but deeply affected, using her music to try and soothe Flora's pain in a way.
Perhaps in the fanfiction, there is a plot twist where Sakura has been brainwashed by an antagonist. The antagonist could be using her to get to Naruto, knowing their close relationship. So, she would then be made to attack Naruto without her own will. Or, there could be a prophecy or some sort of pre - determined fate in the fanfiction's plot that causes Sakura to hurt Naruto, even if she doesn't really want to.
The negative impacts are numerous. Firstly, it promotes a wrong and harmful view of sexual violence, as if it can be used casually in fictional works. Secondly, it can drive away a lot of fans from the Naruto fandom who don't want to be associated with such disturbing content. Thirdly, it violates the spirit of creating positive and respectful fan - made works.
Maybe Sakura has a near - death experience during a mission. Naruto is devastated when he hears the news. When Sakura recovers, Naruto is overly protective of her for a while. Sakura initially finds it annoying but then realizes it's because Naruto cares so much about her. They end up having a conversation where they both admit how important they are to each other in their lives. This kind of event can really enhance the hurt - comfort dynamic between them in fanfiction.