Some of them, like Sakura, might immediately try to tend to his scars and show more care towards Naruto than before. They may start to understand Naruto's pain on a deeper level and vow to support him more in the future.
They might be shocked and feel guilty. In the story, they could realize how much Naruto has endured alone. For example, Sasuke might have a complex mix of emotions, knowing Naruto has faced so many hardships while he was away.
Naruto's scars might be a sign of his loyalty and self - sacrifice. He has always been willing to put himself in harm's way for his friends and the village. The rookie 9 seeing these scars could make them realize how much Naruto has done for them. For instance, his scars from fighting Pain were to protect the village and his comrades. It's a physical manifestation of his unwavering spirit.
In some fanfictions, Snape might be secretly sympathetic. He may see the scars as a reminder of all Harry has been through, which could soften his usually harsh attitude towards Harry, at least for a moment.
RWBY might have a mixed bag of reactions. Since Naruto has its own distinct world with ninjas and jutsus, they could be confused at times. Ruby might find it hard to follow some of the more convoluted fan - created plots. Weiss could appreciate the creativity that goes into building new Naruto - related stories. Blake may draw parallels between the themes in Naruto fanfiction and her own experiences. Yang would be the one to look for the humor in the fanfictions, if there is any.
The rookie 9 seeing Naruto's scars is a moment of revelation. Naruto has always been a bit of an enigma to some of them. His scars could make Hinata even more protective and caring towards him. Lee might find even more inspiration in Naruto, seeing his physical marks as a testament to his never - give - up attitude. Sasuke, on the other hand, might have a complex reaction. He may be reminded of his own journey and how Naruto has also suffered, which could potentially change their dynamic in some way.
Naruto might be super excited. He loves making new friends, and a toddler would be like a new little friend to him. He'd probably start showing off his ninja moves to make the toddler laugh.
He might be really surprised. In alternate universe fanfiction, things could be so different from his own world. For example, he could see versions of himself with different powers or relationships. It would be like looking into a strange mirror that shows a distorted but fascinating view of his life.
Well, Boruto might have a range of reactions. If the fanfiction shows Naruto as a really powerful and cool hero, which he is, Boruto would probably feel proud. But if it's something that twists Naruto's character in a negative way, he would likely be angry or defensive. He respects his father a great deal, so any false portrayal could upset him. He may also find some of the more out - there or creative fanfictions amusing, like ones that put Naruto in a completely fictional adventure that's way different from what actually happened.
If Triton reacts with anger, maybe because he feels Percy has been too reckless and has put the underwater world at risk in his battles (as evidenced by the scars), then he could try to isolate Percy. This would force Percy to find new ways to prove himself not only to Triton but also to the rest of the world. It could also lead to Percy having to make some difficult choices about whether to fight Triton's opposition or try to find a way to reconcile with him.
He might be really surprised. Fanfictions often have different takes on his story and his friends. Some fanfictions might show him in situations he never thought of, like different relationships or new adventures. He'd probably be curious to see how others view his world.
In this fanfiction, Merlin's scars could potentially be a sign of his past battles or magical mishaps. They might also be a way to show his vulnerability, which the knights may not have expected from the powerful Merlin.