Well, in such a fanfic, Naruto might initially be confused. He could start comparing his own life experiences with those of his alternate self. Maybe they would exchange stories about their training, friends, and enemies.
One interesting plot twist could be that the alternate Naruto is from a parallel universe where the roles of good and evil are reversed. This would force the real Naruto to question his own beliefs and values. And it might also lead to a battle between the two Narutos, not just a friendly encounter, as they fight over what is right and wrong.
In such a fanfiction, Neji might initially be in shock when he meets his alternate self. He could start to question his own life choices and beliefs. For example, if his alternate self has made different decisions regarding his loyalty to the clan or his relationships with other characters, it would force the original Neji to re - evaluate his own stance. Maybe they would even engage in a sparring match to test each other's skills, which could lead to a new understanding of his own abilities.
Maybe a dark version of Neji himself could be the antagonist. This could be a Neji from a parallel world where he succumbed to hatred and envy. He might try to destroy the 'good' Neji and take over his life, believing that his way is the right way and that the other Neji is a weak version.
Well, Naruto might try to give his younger self some advice. Maybe he'd tell him to train harder or to be more understanding of Sasuke earlier. It could be a really interesting scenario where the older Naruto tries to prevent some of the bad things that happened in his past from occurring again.
Friendship might be a theme. The older Naruto could emphasize to his younger self the importance of his friends, like Sasuke, Sakura, and Kakashi. Also, the theme of destiny. The older Naruto can tell his younger self that he has a great destiny ahead and should keep striving for it. And it could be about forgiveness too, as Naruto has had to forgive many of his enemies throughout his journey.
They could go on an adventure to explore a long - forgotten part of the ninja world. Maybe they find ancient scrolls with new jutsu. His female self might be better at deciphering the old writings, and Naruto could use his physical strength to protect them from any threats during the exploration.
At first, Naruto could be a bit skeptical. He might think it's some kind of trick or illusion. But once he realizes it's really his future self, he would be excited. He would want to know about his future family, if he has one. He'd also be interested in the state of the ninja world in the future. His reaction would be a mix of excitement, curiosity, and a determination to make sure his future turns out as good as his future self's seems to be.
Harry's reaction could be complex. Initially, he might be in disbelief and think it's some sort of trick or illusion. But once he realizes it's really them, he would be overcome with emotion. He could be a bit shy at first, not knowing how to act around them. But as time goes on, he would become more comfortable and start to bond with them, sharing his experiences in his own dimension and learning about theirs.
In this 'Naruto meets his female self' fanfiction scenario, it could be that his female self has a different personality. She might be more in touch with her emotions. They could initially clash because Naruto is used to his own way of doing things. But then they might learn from each other. For example, Naruto could learn how to better handle his relationships from his female self, while she could learn his fearless attitude in battle.