Often, in fanfiction, Naruto with Kyuubi's eyes is shown to have enhanced abilities. Writers may show him using the Kyuubi's eyes to see through illusions more easily. They might also describe his vision as being able to detect the slightest movements or changes in chakra flow. His appearance could also change slightly, with the eyes being a central focus. Maybe his pupils become slitted like a fox's, which adds to his overall otherness. This new look could also attract different reactions from characters in the story, from admiration to fear.
Some fanfictions might depict the Kyuubi eyes as having a mind of their own. They could be constantly communicating with Naruto in a silent way, guiding his actions or warning him of danger. It's like they are a separate entity within him that he has to learn to work with.
Some writers might show Naruto's physical changes. He could gain more strength or speed after facing tough opponents in the forest. For instance, if he has to constantly run away from a powerful enemy, his leg muscles could develop more, making him faster in future battles.
Fanfiction writers may depict his pain through his relationships. He could be more irritable with his friends, which shows his internal struggle. Or he might avoid certain people altogether. His pain could also be shown through nightmares or flashbacks that he experiences, which are common ways to convey the lasting effects of trauma in a character.
Often, they portray it as a complex relationship. Since Naruto has a long - standing connection with the Kyuubi's power, in fanfiction with a fem Kyuubi, there could be a sense of mutual respect. Naruto might respect her power and she might respect his tenacity.
In many fanfictions, their relationship is a deep friendship that is tested by the mystery of Riddle. They start with a mutual respect for each other's abilities. As they dig deeper into Riddle - related mysteries, their bond grows. Hermione might use her vast knowledge to analyze Riddle's actions, while Harry uses his experience with the Dark Lord. They communicate openly and trust each other completely, which is a key aspect of their relationship in these stories.
Fanfiction writers usually focus on the physical and emotional reactions. Physically, they might write about how their hands tremble slightly when they reach out to touch for the first time. Emotionally, they could describe a sense of homecoming or a feeling of finally finding the missing part of themselves. There could also be a lot of internal monologue from both Bella and Edward, like Bella thinking 'Who is this beautiful, mysterious boy?' and Edward thinking 'Why is this human girl so different?'. Writers may also set the scene in a very atmospheric way, like a misty forest or a crowded cafeteria to enhance the moment.
Writers often depict Naruto as a very protective figure towards baby Sasuke. He might be like an older brother, always making sure Sasuke is safe and has enough to eat.
Some writers will describe the child's appearance based on their abilities. Since Naruto has a strong physical build due to his ninja training, the child might have a somewhat athletic build as well. If they inherit Shion's spiritual powers, they could have an otherworldly glow about them. Their hair could be long like Shion's or short like Naruto's, depending on the writer's vision. Maybe the child has a tattoo or marking on their body that is related to Shion's spiritual lineage, but in a more subdued form so it doesn't overpower their overall ninja - like appearance.
They often start with a unique event. For example, Naruto could be exposed to a powerful chakra source that changes his physiology. This new source of chakra could be something ancient and otherworldly. Another way is through a bloodline awakening. Maybe Naruto discovers he has a hidden bloodline that gives him godlike powers. This could be related to a long - lost clan in the Naruto world.
Writers will sometimes create internal monologues for the characters. Neji might be thinking about how Naruto is different from what he expected, and Naruto could be thinking about how cool Neji is. They also use the idea of shared experiences. For instance, going on a difficult mission together and how that experience changes their relationship. They might start to understand each other's pain and hopes, which in turn shows their chemistry in the fanfiction.