Regarding his family, Hikaru could understand their support for his Go journey better. He might go back in time and be more open with them about his passion for Go. This could lead to his family being more involved in his Go - related activities, like attending more of his tournaments and providing more emotional support. Maybe his family could also play a role in promoting Go in the community because of Hikaru's influence.
If Team 7 went back in time, Naruto and Sasuke's relationship could become stronger earlier. Maybe Naruto could understand Sasuke's pain from the past better and be able to prevent some of the rifts that formed between them. Sakura might also be more confident around Sasuke in the past, knowing what she knows now. Their bond as a team could be tighter as they work together to change things in the past without making big mistakes.
One interesting plot idea could be that Hikaru goes back in time to the era when the Go masters of old were alive. He then challenges them to games of Go, learning new strategies and techniques that he brings back to his own time. This could lead to him becoming an even greater Go player and changing the way modern Go is played.
It's possible that there could be some strain on their relationships. The stress of being in a different time and the fear of changing things could cause arguments. Maybe they have different ideas about what they should do while in the past. For instance, Fred and George might want to have some fun and explore, while Harry is more focused on achieving a specific goal related to the future, which could lead to some friction between them.
Link's relationship with his own past self could be a really interesting aspect. If he meets his younger self, there could be a sense of mentoring or even confusion. His younger self might not understand what's going on at first. And when it comes to friends like the Koroks, if he goes back to a time when the Korok Forest was in a different state, their interactions would be new and different. The overall web of relationships would be completely reshaped as he steps into a different time period in Hyrule's history.
Well, their relationships might become more complex. For example, Percy and Thalia might have a different dynamic as they see each other in a new light in the past. Since they are in a different time, they may rely on each other more for survival, which could strengthen their bond. Nico, being a bit of an outsider among them, might find himself more in tune with Percy and Thalia as they face the challenges of the past together. They may also form new relationships with people from the past, which could in turn affect their relationships with each other.
Well, for Naruto and Sasuke, their relationship might become even stronger earlier. In the past, they could train together more and understand each other's pain from the start. Sakura might be more assertive in her relationship with Sasuke, as she has the knowledge of what will happen in the future. She could try to prevent Sasuke from going down a dark path right from the beginning. And among the other members of Konoha 12, they might form closer bonds as they rely on each other more in this strange new situation of being in the past.
If Goku travels back in time as a Super Saiyan in fanfiction, his relationship with his past self would be complex. His past self might look up to him as a hero and a mentor, but at the same time, there could be some envy or confusion. With his Saiyan comrades, he could become a leader figure much earlier, changing the power dynamics among them. Also, his interactions with Earthlings would be different. They would be more fearful or more in need of his protection, depending on how he uses his power in the past.
Their relationships would likely become stronger. They would have to rely on each other more in the unfamiliar past environment. For example, Naruto might look up to Kakashi even more as he sees how much Kakashi has grown and changed. Sasuke might be more open to the idea of teamwork as they face challenges together in the past.
If Merlin travels back in time, his relationship with Arthur would be very different. In the past, Arthur might not trust him at all at first. Merlin would have to prove himself all over again. With Gwen, he might be more aware of her future importance and try to protect her in a different way. And his relationship with the other knights could be completely new, as they might see him as a stranger with strange powers.
If Natsu goes back in time, his relationships would be very different. With his friends, he might have a new level of understanding. For example, he could see how they grew up and the challenges they faced in the past. He might be more protective of them, especially if he knows what's going to happen in the future. His relationship with Lucy could also change. He could see her in a new light, perhaps realizing things about her that he didn't before when he first met her in the present.