I'm not sure of a specific 'shulk x palutena fanfic' to recommend. You could try searching on fanfic platforms like Archive of Our Own. They usually have a wide range of fan - created stories.
The theme of self - discovery is also quite common. Through their relationship, both Fiora and Riven may learn more about themselves. In some fanfics, Fiora discovers a new side of herself as she gets to know Riven better. And Riven may come to terms with her past and her identity through her bond with Fiora.
The plot might involve Aatrox being intrigued by Fiora's unwavering courage. He could see in her a potential to be a great warrior on his side, not as a minion but as an equal. So he tries to persuade her to join his cause, which leads to a series of intense dialogues and battles between them, as Fiora is hesitant but also curious about Aatrox's power.
One possible plot could be that Shulk and Palutena have to team up to face a powerful new enemy that threatens both of their worlds. Along the way, they start to understand each other's powers and cultures better, and a romantic relationship slowly develops.
One popular Fiora x Riven fanfic is 'The Duelist's Bond'. It explores their relationship in a world filled with challenges. They start as rivals but gradually develop a mutual respect that could potentially turn into something more. The story is full of great fight scenes and emotional moments.
For Fiora, you can focus on her noble upbringing and her sense of honor. Show how these traits influence her actions when she meets Aatrox. For example, she might be disgusted by Aatrox's use of dark magic but also respect his power.
For Aatrox, you could focus on his past as a Darkin. His internal struggle between his dark nature and any glimmers of his former self could be explored. Show how Fiora's presence either exacerbates or soothes this conflict. For Fiora, her pride as a duelist is key. You can show how she reacts when faced with Aatrox's power that might be greater than what she's used to. Does she become more determined or is she momentarily daunted?
A theme that often appears is the power struggle. Given that they both seem to be strong characters in their own right, fanfics might explore how they deal with power dynamics between them. Maybe they compete at first and then realize they can be stronger together. It's also possible to see themes related to loyalty and betrayal. For instance, they might have to choose between their loyalty to their factions and their feelings for each other in some fanfics.
One idea could be a story where Aatrox, the Darkin Blade, and Fiora, the Grand Duelist, are forced to team up. Maybe there's a greater threat to their world that only their combined skills can face. They start off distrusting each other, but as they face challenges together, they gradually come to respect one another's abilities.
Definitely. Some fanfic authors are more interested in exploring Fiora's backstory, like how she became the skilled fighter she is. They might write about her training, her family influence, and her rise to prominence in her world. These types of fanfics usually don't involve carnal desire and can be really interesting to read.