One possible plot development is that Naruto's awakened bloodline gives him the power to manipulate elements in ways not seen before. For instance, he could combine fire and water to create a new type of steam - based attack. This new power would make him a target for powerful villains who want to either control him or eliminate him. As a result, Naruto has to go into hiding while he learns to master his new abilities, and he meets some interesting characters during this time who help him on his journey.
Well, one interesting plot development could be that Naruto discovers his hidden bloodline has a unique power that allows him to communicate with ancient spirits. This new ability could lead him to uncover secrets about the ninja world's past and give him an edge in battles against powerful foes.
Well, one possible plot development could be Naruto using the Mokuton ability to create large forest defenses during battles. For example, he might grow thick trees around his village to protect it from invaders.
A possible plot development is that the dragon bloodline in Naruto causes other ninja clans to be either jealous or fearful. This leads to political intrigue where some clans try to either steal his bloodline or eliminate him. Naruto then has to navigate through this web of deception and danger while also trying to master his new powers. He might even form unexpected alliances with clans who see the potential of his dragon bloodline for the greater good.
One interesting plot development could be the new relationships that form between characters. For example, Naruto and Hinata might face new challenges as a married couple in the post - last story world. Another could be the growth of their children, like how Boruto and his siblings adapt to their parents' legacies.
Another aspect could be that Naruto's baby form has some unique abilities or auras. Maybe his presence as a baby has a calming effect on some of the more aggressive characters in the Naruto world. His friends could also discover new things about his past or his family through his baby state, like finding a hidden mark on his body that gives clues about his heritage.
In some 'naruto and kurama merge fanfiction', Naruto might gain new and extremely powerful abilities. For example, he could have enhanced physical strength and speed far beyond his normal limits. This merge could also lead to a new form of chakra control, allowing him to perform techniques that were previously impossible.
Well, one interesting plot could be Naruto, as a female, having to deal with different social expectations in the ninja world. For example, she might face more challenges in being taken seriously as a strong fighter since there are some gender biases in the original Naruto world. Another could be her new relationships with other characters. Maybe she forms a different kind of bond with Sasuke, not just as a rival but in a more complex, perhaps more emotionally charged way.
Maybe Naruto gains new insights into the nature of chakra. The Kyuubi's chakra is very different from his own, and through the merge, he could understand how to manipulate chakra in ways he hadn't considered. This could lead to him teaching others new ways of using chakra as well.
In a fanfiction, you could have a scenario where an enemy uses a dark form of Bakuton bloodline power. Naruto and his comrades must find a way to counter it. They seek out an old hermit who has some knowledge of the Bakuton bloodline's weaknesses. Along the way, they learn more about the bloodline's connection to other elemental powers in the Naruto world, and how it can be used for both destruction and creation.
One idea could be a story where a character with the Shikotsumyaku bloodline discovers a new and powerful bone - related ability that no one in their clan has ever had before. This could lead to them being both feared and respected within the Naruto universe.