Well, in fanfiction, Kurama's human form could be a really imposing figure. He might have long red hair, just like his fox form's fur color, and bright, piercing eyes. Maybe he'd be tall and muscular, with a sort of wild, untamed look about him, still carrying that powerful presence that he has as a tailed beast.
Often in fanfictions, Kurama's human form and Naruto have a more complex relationship. They could argue at times, especially when Naruto wants to take risks that Kurama thinks are too dangerous. But at the same time, they also share some really tender moments. For instance, Kurama's human form might comfort Naruto when he's feeling down about his past or his struggles with the village. They would have a deep bond that goes beyond just being a jinchuriki and a tailed beast.
Some fanfictions use Kurama's human form to explore cultural differences. If we assume he takes on a human form in a different cultural setting, it can lead to really interesting scenarios. For instance, how he adapts to different social norms, languages, and traditions. This adds a whole new layer to his character and the stories that can be told about him.
A lesser - known but really engaging fanfiction is 'Kurama: Human Form Unveiled'. It focuses on the mystery surrounding Kurama's human form and how it affects his interactions with other characters. The author does a great job of building up the tension and intrigue as the story progresses.
He might become more empathetic in his human form. Since humans have a wide range of emotions and experiences, Kurama could pick up on these and become more in tune with the feelings of others compared to when he was just a fox demon.
Another plot could be that Kurama's human form has a special ability that is unique even among his demon abilities. This ability attracts the attention of both good and evil forces, and he has to figure out how to use it without causing chaos.
One common theme is identity. Kurama has to figure out how his demon self and his human self coexist. Another theme is friendship. Since he's in the human world, he forms relationships with humans which often play a big role in the stories.
A common theme is the clash of two different worlds. Kurama being a demon and the human coming from a completely different realm. Another theme is acceptance. The human has to accept Kurama's true nature and Kurama has to understand human emotions and values.
Give the Okami in human form a backstory that ties them to their original form. Maybe they were cursed to be in human form as a punishment or they chose to take human form to better understand humans. Their actions should also be influenced by their Okami nature. For instance, they might be more in tune with the phases of the moon and act differently depending on whether it's a full moon or a new moon. Their speech could also be a bit more formal or archaic, reflecting their otherworldly origin.
One common theme could be the exploration of the power dynamics between Naruto and Kurama in his fox form. Since Kurama is such a powerful entity, in these fanfictions, it might be about how Naruto manages to control or work with Kurama in a more intimate way, which could be related to the 'lemon' aspect, perhaps symbolizing a deeper, more passionate connection.