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.
In a 'amaterasu x waka fanfiction', the author might play around with the cultural backgrounds of these characters. Amaterasu is often associated with Japanese mythology. So the story could draw on that rich mythology while also developing Waka's character in a way that fits into this world. Maybe it shows how Waka respects and learns from Amaterasu's divine nature, and in turn, Amaterasu discovers something new about the mortal world through Waka.
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.
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.
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.
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.