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.
Amaterasu could be portrayed as being attracted to the bright color of lemons, similar to how she is associated with the sun. The lemons' color might remind her of her own power and essence. So, she could be depicted as seeking out lemons for their aesthetic and symbolic value.
In a fanfiction, Amaterasu could be cursed, and the only way to break the curse is to find a lemon that has been blessed by the sun god (which could be related to her origin as Amaterasu is a sun goddess). She embarks on a journey through different realms, facing various challenges. She meets new characters who either help or hinder her quest for the special lemon. As she searches, she also uncovers secrets about her past and the history of the world she inhabits.
One common theme is the exploration of their opposing natures. Amaterasu is often seen as a symbol of good and light, while Oki represents more of a wild and somewhat darker force. Fanfictions might play with how they interact and balance each other out.
For Naruto, his development could involve learning to master the Amaterasu power from Okami. He might start off being reckless with it, but as the story progresses, he becomes more in control. This could also lead to his growth in terms of how he is perceived by others, from being seen as just a boisterous ninja to a powerful and respected figure with a new, mysterious ability.
One plot idea could be a crossover where Naruto gains the power of Amaterasu from Okami. He could struggle to control this new and powerful ability, facing challenges from both within his own village who fear his new power, and external enemies who want to use it for their own evil purposes.
One possible plot could be Naruto discovering his divine heritage. He might gain new powers related to Amaterasu Okami. For example, he could have the ability to control some form of sacred fire or light. This would change his relationship with the other characters. His friends might be in awe or a bit scared at first. His enemies would surely see him as an even greater threat.
Naruto's character development might include a deeper sense of responsibility. Since he is the son of Amaterasu Okami, he may feel a greater obligation to protect the world. He could develop new skills not just in combat but also in diplomacy. He has to deal with different factions in the ninja world who have different views on his new status. This would force him to grow and mature in ways he hadn't before.
Well, Archive of Our Own (AO3) might also have some great Okami Amaterasu x Oki fanfiction. You can search using the relevant tags. Some of the fanfics might explore their relationship in the context of the Okami world, like how they interact during different in - game events or how their relationship could develop over time.