One idea could be that Pit is kidnapped and Hades tries to corrupt him. Maybe Hades offers Pit power in exchange for his loyalty. Pit, being the heroic character, resists but has to find a way to escape while also facing the internal struggle of being tempted by such power.
One popular Kid Icarus Pit x Dark Pit fanfiction is 'Bond Beyond the Battle'. It explores their relationship in a post - war scenario, delving deep into how they support and understand each other on a more personal level.
Another theme is self - discovery. As they interact more, both Pit and Dark Pit often discover new aspects of themselves. For example, Dark Pit may find more of his 'good' side through his relationship with Pit, and Pit may become more confident in his own abilities. It's all about how their relationship impacts their individual growth. This can be seen in various fanfictions where they face challenges that force them to look within themselves. Some fanfictions also have a theme of redemption, especially for Dark Pit who was initially more of an antagonist. Through his relationship with Pit, he gets a chance at redemption and to be seen in a new light.
One common theme is the exploration of their relationship, whether it's a deep friendship, a brotherly bond or a complex rivalry. Another theme is their growth as characters, like how they become stronger together.
Redemption is also a theme that can be found. Dark Pit, being a sort of 'dark' counterpart, might be on a journey of self - discovery or redemption in some fanfics. Pit could play a role in this, either as an influence or a guide. This theme adds depth to the characters and their relationship, as it explores the idea of change and growth within the context of their unique situation in the Kid Icarus lore.
Well, Hades might try to force Pit into doing his bidding. For example, he could make Pit fight against his own friends. But Pit, being a strong - willed character, would likely try to find a way out of this situation. He might start by trying to find a way to break free from whatever bindings Hades has put on him.
There's a fanfiction called 'Pit and Dark Pit: United Front'. In this story, they face a powerful common enemy and their bond grows stronger as a result. It's really exciting to read how they work in tandem. Also, 'The Dark to His Light' is a good one which focuses on the contrast and harmony between them.
Another place could be Tumblr. There are many fanfic writers who post snippets or links to their full works on Tumblr. You can search for the relevant tags like #KidIcarus #PitxDarkPit #Fanfic. However, the content on Tumblr might be a bit more scattered compared to dedicated fanfic sites.
One idea could be a story where Pit and Viridi have to team up to save the world from a new, powerful enemy that neither could defeat alone. Maybe this enemy is a corrupted ancient deity that is spreading chaos and destruction.
The relationship could be developed through shared dreams. For instance, they both start having strange dreams about a mysterious place that seems to be in danger. As they try to figure out the meaning of these dreams together, they grow closer. Pit might start to understand Viridi's deep connection to nature better through this experience, and Viridi might see Pit as more than just a fighter for the heavens.