Maybe Naruto has to keep his learning of Kirin a secret at first. He might be afraid of how his friends or the village will react, thinking it's too dangerous or that he's straying from his normal abilities. As he masters it more, he gradually reveals it during crucial battles. Also, there could be a sub - plot where he teaches the basics of lightning - style chakra control to others in the village, which could lead to new jutsu combinations.
One possible plot development could be that Naruto uses Kirin to surprise his enemies. Since it's not a jutsu associated with him usually, it would catch his foes off - guard.
The fanfic could involve Naruto learning Kirin as part of a prophecy or a hidden ability he discovers within himself. His learning process could be intertwined with some ancient lore in the Naruto world. And when he finally masters Kirin, it could be the key to defeating a new, extremely powerful enemy that has emerged, one that is resistant to his normal attacks. This would make the story about Naruto not only growing in power but also in his understanding of the deeper secrets of the ninja world.
One possible plot development is that Naruto's use of the eight gates causes him to have internal struggles. He might have to deal with the physical and mental toll it takes on him. For instance, he could struggle with controlling the power and not going overboard during battles.
In the fanfic, Naruto may learn of his heritage through a new character. Maybe a mysterious ninja shows up who has some connection to his family. This ninja could start to train Naruto in ways that are specific to his family's ninja techniques, revealing more about his heritage as they train together.
Well, he might start by finding an old master who still practices ninshu. This master could teach Naruto the basic principles of ninshu, like the importance of harmony and understanding. Naruto would then use these new teachings to try and bring peace between the warring ninja clans in the Hidden Leaf Village.
Well, one possible plot development could be that Naruto immediately starts training in the unique abilities related to his heritage. For example, if his heritage involves some special jutsu, he might quickly master it and use it to gain recognition in the village. This could change his relationship with his peers as they see him in a new light.
One possible plot development could be that Sakura struggles at first to master the Chidori. She might face setbacks and doubts from her peers, but she perseveres.
Well, in some fanfics, Naruto might first discover his father's identity through a hidden scroll. This could lead to him learning about his father's special jutsu. For example, he could find out about Minato's Flying Thunder God Technique and start training to master it himself, seeing it as a connection to his father.
A possible plot development is that Naruto's study of chakra helps him master a new and powerful jutsu. For instance, he might develop a jutsu that can disrupt an opponent's chakra flow from a long distance. This would give him an edge in battles.
A third possible plot development could be the exploration of family values. Naruto, having grown up longing for a family, would be very committed to building a good family environment for Mordred. This could involve teaching Mordred about love, trust, and the importance of family bonds. Mordred, who may not have had such a positive family experience before, would then have to learn and grow in this new family setting. There could also be moments where Mordred has to defend Naruto or their family from external threats, which would strengthen their bond further.
One possible plot development could be Naruto leaving due to a misunderstanding. For example, if he is wrongly accused of a crime within the team. Another could be that he feels he is holding the team back in some way and decides to leave on his own to become stronger alone. Maybe he has a personal goal that he believes he can't achieve while still being part of Team 7.
One possible plot development could be the initial shock and adjustment for both Naruto and Mei. They would have to deal with the reactions of their respective villages. Naruto's friends in Konoha might be surprised, and Mei's allies in Kirigakure would also have their thoughts.