One common theme is adventure. The oc and Cordelia might go on an exciting journey together, facing various challenges and enemies. It adds an element of action and suspense to the story.
You can try searching on fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, including oc x cordelia ones. Just use the search bar and type in relevant keywords to find what you're looking for.
A common characteristic is the exploration of their different social standings. Chrom being a prince or leader, and Cordelia a skilled pegasus knight. Fanfictions might play with how they bridge that gap in their relationship. For example, some might show how they support each other in their respective roles. Another aspect could be the setting. Since they are from a fantasy - like world, fanfictions may expand on the lore of that world and how it impacts their relationship.
One common theme is the exploration of their unspoken feelings. In the show, their relationship was complex, and fanfiction often delves deeper into those emotions that were hinted at but not fully explored. For example, how they might deal with jealousy when one of them is interested in someone else.
One common trope is the 'love - at - first - sight' or 'instant attraction' trope. Given their characters' charm and good looks, it's often depicted that they have an immediate connection when they first meet. Another is the 'damsel in distress' trope where Cordelia might be in some sort of trouble and Chrom comes to her rescue, which then deepens their relationship.
Love and friendship are common themes. Their relationship often starts as a friendship that gradually blossoms into love. Writers like to explore how they support each other through good and bad times.
The 'soulmate' or 'destined to be together' theme is frequently explored. In these fanfics, there's an underlying belief that they are meant for each other, no matter what obstacles come their way. This could be shown through signs, prophecies, or just a deep, unexplainable connection that they both feel.
There are several good ones. For example, 'The Hidden Connection' explores their unspoken feelings in a very engaging way. It delves deep into their personalities and how they complement each other. Also, 'Shared Secrets' is a fanfiction that shows their journey of trust - building. In this story, they start off as acquaintances and gradually become closer as they share their secrets with each other. This not only makes their relationship more believable but also gives the readers a sense of being part of their journey.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions, and there's a good chance you'll find some great Cordelia x Stahl ones there.
One great place to start looking for Cordelia x Chrom fanfiction is on Archive of Our Own (AO3). There are numerous stories there with different themes and plotlines. Some might focus on their relationship development during the events of the game they are from, exploring how they first met and the growing feelings between them. Another option could be to check out fanfiction.net, though the collection there might be a bit more scattered in terms of quality and organization compared to AO3.