One possible scenario could be Naruto being constantly ostracized in the village. People might avoid him not just because of the Nine - Tails inside him, but also due to false rumors spread about him. For example, they could say he's a bad omen. This would lead to Naruto feeling extremely lonely and isolated, and he might start to train alone more often, distancing himself further from the possibility of making friends.
Naruto might become more introverted. Without friends to interact with, he'd have to rely on himself more. He could develop a very independent streak, focusing on self - improvement in his ninja skills without the motivation of friendship. For example, he might train in solitude for long hours, becoming a very powerful but lonely ninja.
It could be members of the Akatsuki. Despite being antagonists in the original series, in the fanfiction they might have a change of heart. Maybe Pain, after seeing Naruto's resolve, decides to become his friend. Or it could be Orochimaru's former subordinates who see a different path through Naruto.
Perhaps the author has a different interpretation of Hermione's character. In the original series, she has great friends, but in this fanfic, the author might think that there were some underlying aspects of her personality that could lead to her being ostracized. It could be related to her intelligence or her sometimes bossy nature, which the author may have exaggerated to make her seem friendless.
She could start by joining new study groups or clubs at Hogwarts. Since she's so intelligent, she might find others with similar interests in advanced magic studies or ancient runes.
One possibility for a Naruto and Itachi best friends fanfic could be that Itachi, instead of massacring his clan, finds a way to resolve the conflict with the help of Naruto. Naruto, with his unwavering belief in friendship, could convince the Uchiha clan and the village elders to come to a peaceful agreement. Itachi, seeing Naruto's positive influence, becomes his close friend. They could then train together, with Itachi teaching Naruto some of the more advanced Uchiha jutsu, and Naruto in turn sharing his own unique ninja way with Itachi.
Well, without friends, Naruto might become more self - reliant. He'd have to rely solely on himself for training and getting stronger. He might also grow to be more reserved as he doesn't have friends to share his thoughts and feelings with. This could make him more of a lone wolf type, focusing only on his goals like becoming Hokage without the distractions or support of comrades.
The exploration of characters in new ways. For instance, seeing Naruto in a relationship that's not the typical romantic one from the original series. It can add depth to his character and show different sides of him. Also, the way the author plays with the 'friends with benefits' concept within the Naruto world's rules and culture can be really fascinating.
One popular 'Naruto Friends with Benefits Fanfic' could be 'Naruto's Unlikely Bond'. It explores an interesting relationship dynamic between Naruto and another character. It delves into how their friendship takes on a different level while still maintaining the essence of the Naruto universe. However, fanfics can vary greatly in quality, so it's also important to look at reviews from other readers to ensure it meets your expectations.
A possible plot is that Gaara is having trouble controlling his inner demon again. Naruto, having experienced similar issues, offers to help him. They go on a journey to find a way to calm Gaara's inner turmoil. During this journey, they encounter various challenges and also meet old friends and foes. Through shared hardships and Naruto's constant encouragement, Gaara finally gains better control. Their friendship is strengthened through this life - changing experience.