If their friends found out, Kiba might tease Naruto a little bit, but in a friendly way. He respects Hinata and Naruto, so he'd be okay with it. Ino would be all excited and would start asking Hinata for details. She's always interested in romantic stuff. Lee would be super positive and give Naruto a big thumbs - up, saying something like 'Youthful love is wonderful!'. And Neji, if he were still alive, would be very protective of Hinata at first, but then see how happy Naruto makes her and be supportive.
Hermione would probably be very shocked at first. She has always seen Draco as the enemy, so it would take her a while to come to terms with it. Ron might be more vocal in his opposition, thinking it's a really bad idea. But if they saw how happy Harry was, they might gradually warm up to the idea.
Some of their more open - minded friends might be supportive right away. For example, Annabeth could see how happy Percy is and choose to accept Nico into their circle, despite any initial doubts. She would probably give them some advice on how to handle their relationship in the often - chaotic demigod world.
His friends might be really shocked at first. They know Naruto as a ninja, not someone who sings fanfiction. Some might find it hilarious and start teasing him in a friendly way. For example, Shikamaru might say something like 'Only you, Naruto, would come up with something so strange.'
Harry would probably be shocked at first. He respects Remus a great deal, but Hermione is like a sister to him. He'd need some time to come to terms with it. Ron, on the other hand, might be more openly opposed. He has always had a bit of a protective streak when it comes to Hermione, and he might think Remus is too old for her. Ginny would likely be more understanding and might try to mediate between the others.
The Weasley family in general would be quite divided. Some of the older Weasleys might be more traditional and disapprove, thinking that Hermione could have done better. But the younger Weasleys like Luna might be more accepting. Luna has always been open to different ideas and relationships. As for Draco's friends, they might also be shocked. Some of his Slytherin friends might feel betrayed that he has married a Gryffindor, while others might see it as a bold and interesting move.
If his friends found out, they would all react differently. Isaac might tease him a bit about it, but in a friendly way. Derek, on the other hand, would be more stoic and might wonder if there was something deeper behind Stiles' interest. Stiles would have to defend himself, saying that he just finds the werewolf concept in fanfiction fascinating. His friends would then start to notice little things about Stiles that they hadn't before, like his knowledge of werewolf lore that he's picked up from the fanfiction, and it could change their dynamic in an interesting way.
Some of his friends might be really surprised. Scott, for example, might be a bit worried that Stiles' vampire obsession could lead him into dangerous situations. Lydia, on the other hand, could be more intrigued and might want to know more about the fanfiction. She might see it as an interesting intellectual pursuit.
Well, if his friends found out in the fanfiction, it would be a big deal. Percy's friends are used to depending on him in their battles and adventures. Finding out he's a dad would make them re - evaluate their relationships. Leo might crack a joke at first to ease the tension, but then they'd all realize the seriousness of the situation. Some might be concerned about the safety of the child, given the dangerous world they live in. They'd also have to adjust to the fact that Percy now has a new priority in his life, and they'd need to figure out how to support him while still continuing their own quests.
Sakura would be really happy for them. She has seen Naruto grow and has always wanted him to find true love. Since she has moved on from her old feelings for Naruto, she would be supportive and might even offer to help with the wedding preparations. Shikamaru would probably be a bit lazy about it at first, but deep down he'd be glad for Naruto. He'd say something like 'What a drag, but if it makes you happy, Naruto.' Kiba would be excited, especially since Hinata is his teammate. He might tease Naruto a bit about finally getting the girl.
Sasuke would likely act like he doesn't care much. But secretly, he might be a bit intrigued as to why Naruto is into such things. He might think it's a waste of time or he could see it as another way Naruto is different from him.