His relationship with his family, if he has one in the story, would be different. Maybe he was distant from them as an adult, but as a kid, he becomes more dependent on them. His friends would also have to adjust. Some might be really good at handling the new kid Robin, while others might struggle. And those who were jealous of him as an adult might feel guilty about having negative feelings towards a child Robin.
With his mentor or teacher figure, the dynamic would shift. Instead of being the student who is learning, Robin as a kid might be more in need of basic life lessons. His friends who were used to his equal partnership would now have to be more patient and understanding. They might find his child - like innocence endearing but also frustrating at times. And his relationship with any rivals could become more complex as they might not know how to deal with a kid version of him.
His relationship with Hermione would be really different. As a kid, he might be more open about his feelings for her in an innocent, child - like way. He could be constantly following her around, wanting to be involved in whatever she's doing, like when they were younger in the original story but even more so. With Harry, they would probably get into more silly adventures together, like building forts in the Gryffindor common room or trying to catch magical creatures in the castle grounds.
His relationships with male friends might become more complex. They could start seeing him in a different light, maybe with a new - found attraction or a sense of awkwardness. For instance, if he had a close male friend before, that friend might struggle with how to act around him now. With female characters, he could either form a sisterly bond or face some jealousy if they see him as a threat in terms of male attention. His enemies might also underestimate him, thinking that as a girl he is weaker, but he would prove them wrong.
Well, with his mother, Sally, it would be a very different dynamic. Sally, who has always been proud of the grown - up Percy, would now have to mother him all over again. She would be more protective and might even try to keep him away from the dangerous demigod world for a while. As for his enemies, they might underestimate him at first. But as they realize that even as a kid, Percy still has some of his heroic instincts, they would start to see him as a threat again. His relationships with the gods would also shift. Some gods might pity him and be more lenient, while others might see it as an opportunity to manipulate him more easily.
His relationship with Sasuke would likely be affected. Sasuke might initially be suspicious of Naruto's new form, thinking it could be a trick by an enemy. But as time goes on, they could find new ways to work together. Naruto's new Kitsune powers could complement Sasuke's skills. For example, Naruto could use his enhanced speed as a Kitsune to keep up with Sasuke in combat.
His relationship with Astrid would become really strained. She'd be heartbroken that he doesn't remember their relationship, and she'd have to work hard to make him fall in love with her all over again. It would be a journey full of mixed emotions for her, from sadness to determination.
Regarding his family, if Dabi forgets his past with them, his family members would be in a difficult position. Endeavor might feel guilty for all the things he's done to Dabi in the past and try to make amends. His siblings, like Fuyumi and Natsuo, would be shocked but also hopeful that they could have a normal relationship with Dabi now. However, as Dabi's memories start to come back, it could lead to a very complex and emotional roller - coaster of relationships.
His relationship with Sasuke would likely be very different. Sasuke might be more suspicious of Naruto at first, seeing him as an unknown entity. But as they learn more about Naruto's new situation, they could develop a deeper bond based on Naruto's unique perspective.
His relationship with Gray might become more complicated. Gray might be more hesitant to pick fights with Natsu now that she's a girl. And with Lucy, they could become closer as girlfriends, sharing more secrets and having sleepovers. Natsu might also attract new male friends who are interested in her as a girl.
His relationship with Ron would definitely change. Ron might be a bit more hesitant around her at first, not really knowing how to act. But as time goes on, they could develop a deeper, more platonic bond. It would be like Ron having a sister all of a sudden.
Well, with Dipper becoming a girl in the fanfiction, his relationship with Mabel would have a new dynamic. Mabel would be all about embracing Dipper's new form. She'd be planning slumber parties and trying to give Dipper a new 'girly' identity. As for Wendy, Dipper might find himself more in tune with Wendy's interests on an emotional level now that he's a girl. Wendy might be more open to sharing her feelings with Dipper - girl. His relationship with the townspeople could also change. Some might be more accepting, while others might be a bit more judgmental. And his relationship with the supernatural elements in Gravity Falls could be different too. Maybe some entities are more attracted to his new form, while others are repelled, which would lead to a whole host of new adventures and challenges in their relationships.