One interesting fanfiction could be where Amaterasu and Waka go on a journey to discover a hidden part of their world. In this story, they might face challenges that test their bond and individual powers.
One plot idea could be Amaterasu living among humans in her human form and using her divine powers secretly to help them. For example, she might use her ability to control nature to end a drought in a small village. Another could be her forming a friendship with a human artist who, unknowingly, starts to paint pictures that are prophetic due to her influence. A third idea is that she has to hide her identity from a group of hunters who are searching for any signs of the divine, as they believe the gods are causing chaos.
She would likely have long, flowing hair, perhaps a golden color like the sun, to represent her divine origin. Her eyes could be a bright, piercing blue or amber, full of an otherworldly intelligence. She would have a graceful figure, with a certain poise in her stance that makes her seem both approachable and yet somewhat ethereal.
Perhaps a powerful demon that has a grudge against the power of Amaterasu. It targets Naruto because he is the one who seems to be getting closer to Amaterasu. The demon could be from an ancient time when Amaterasu was first used to seal it away, and now it's back to stop Naruto from fully understanding and using Amaterasu.
One idea could be that Amaterasu, in some way, imparts a special power to Naruto. Maybe it's a power that helps him control the Nine - Tails better. For example, the flames of Amaterasu could have a calming effect on the Nine - Tails' chakra.
Percy's power over water could be used in combination with Amaterasu's sun - based powers. For example, if they were facing a fire - based enemy, Percy could create a mist or a large body of water to cool things down while Amaterasu's sunlight could evaporate the water, creating a powerful steam - based attack.
One interesting plotline could be Naruto's struggle to balance the power of Amaterasu and his connection with the Fem Kyuubi. Maybe he has to use the powers in harmony to defeat a powerful new enemy that threatens the Hidden Leaf. Another could be a love triangle situation where Naruto's bond with the Fem Kyuubi and the influence of Amaterasu create some romantic tension. It could also involve Naruto using the unique abilities of both to explore a new realm or unlock some ancient secrets.
There are likely some. You could also try reaching out to Naruto or Okami fan communities on social media platforms. People in those groups might be able to recommend some great 'Naruto is Okami' fanfiction. It really depends on what you're looking for in a story, whether it's a more action - packed version of Naruto with Okami - like abilities or a more character - driven story exploring how Naruto would be different if he had an Okami - like essence.
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.