A possible plot is that de - aged Naruto is sent to a parallel universe where things are very different in the ninja world. He has to adapt quickly and find a way back to his own universe while being a child, which would be full of challenges and new discoveries.
A possible plot is that when Naruto is de - aged, he forgets some of his later - learned ninja techniques. So he has to start from scratch and relearn them in a different way. This could lead to him developing new and improved versions of those techniques. Also, the de - aging could be part of a villain's plot. Naruto then has to figure out how to reverse it while also dealing with the chaos that his sudden change in age has caused in the village, like how his friends now have to protect him instead of the other way around.
He might develop new relationships. Since he's de - aged, he could make friends with people who he didn't interact much with before. For example, he could befriend some of the younger ninjas in a different way and learn from them too. This could change his perspective on teamwork and friendship.
A really interesting plot could be Naruto traveling back in time to the era before he was born. He could meet his parents and other important figures in the village's history. This would give him a chance to understand the roots of the village better and also learn some new jutsu or strategies that he could bring back to his own time to make the Hidden Leaf even stronger as a Hokage.
A more emotional plot could be that Karin discovers a long - lost relative who has a connection to Naruto's family. This discovery brings them closer together as they explore their families' pasts and how it impacts their present. They might also uncover some secrets about the Uzumaki clan along the way.
One idea could be exploring the hidden powers within the Uzumaki clan that Naruto has yet to fully discover. Maybe there are ancient seals or techniques passed down only within the clan that could give him an edge in battles. Another plot could revolve around Naruto finding long - lost relatives from the Uzumaki clan who have been in hiding all this time and they bring with them new knowledge and skills. Also, a fanfic could focus on the Uzumaki clan's history during the time before Konoha was founded and how their actions influenced the future ninja world.
One idea could be exploring Naruto's relationship with his parents during his childhood if they were still alive. Maybe showing how Minato and Kushina would train him and the family adventures they'd have in Konoha.
One idea could be Naruto going on a secret mission in a hidden land not yet explored in the original series. Maybe he discovers a new type of chakra there.
In such fanfics, you might find Naruto dealing with the expectations and responsibilities of being a ninja at a younger age. They might also play with the idea of time travel or alternate timelines, adding an extra layer of excitement. The character development can take unexpected turns too.
Well, a possible plot could involve Harry being de - aged due to a spell gone wrong in one of Snape's potions experiments. Severus then has to take on the role of a caretaker. He could start to see Harry in a new light, not just as James Potter's son. And Harry, in his de - aged state, might be more open and trusting towards Severus, leading to some heart - warming moments between them as Severus teaches Harry some advanced magic concepts in a more gentle way than he would with an older Harry.
One plot idea could be that de - aged Snape has to adapt to the modern wizarding world in the community. He might be shocked by new spells and technologies. Another could be that he forms unexpected friendships with younger students as he is now closer to their age. For example, he could bond with a young Gryffindor over a shared love of potions in a new, more innocent way.