One common theme is friendship. The OC and Amber often start as friends or allies and develop a deeper bond over time. Another theme is power and responsibility. Since Amber has her own powers and role in the RWBY world, the OC might also have to grapple with their own abilities and how they can contribute. Adventure is also common, as they go on quests or face Grimm together.
One great place to start looking for OC x Amber RWBY fanfiction is on Archive of Our Own (AO3). Just search for 'oc x amber rwby' and you'll find a variety of stories. Some might focus on adventure scenarios where the OC and Amber team up to fight Grimm. Another option could be to check out FanFiction.net, though the selection there might be a bit different. There are often stories that explore the relationship between the OC and Amber in the context of the RWBY universe, like how they meet and grow closer over time.
One common theme is the exploration of their different personalities. Amber is often seen as more noble and Mercury as more of a troubled character, so fics might focus on how they balance each other out.
One common theme is power struggle. Cinder is often power - hungry, and Amber is a Maiden with great power. Their interactions can be centered around who is more powerful or who gets to control certain things. Another theme is redemption. Some fanfictions explore the idea of Cinder finding redemption through her relationship with Amber.
Another option is to look on Wattpad. While the quality can vary, there are often a lot of RWBY - related fanfictions on there. When you search for 'rwby amber x mercury fanfiction', make sure to read the descriptions carefully to find ones that seem interesting. Some might be part of a series or have a unique take on the relationship between Amber and Mercury.
There's a fanfiction called 'Cinder and Amber: A Forged Bond'. In this story, it begins with their initial encounter and gradually builds up their relationship. It shows how Cinder's ambition and Amber's protectiveness of the Relic play into their connection. The author does a great job of describing their emotions and the power dynamics between them.
One interesting fanfiction could be where Amber and Emerald are forced to team up during a difficult mission in Vale. They start off distrusting each other, but as the story progresses, they discover they have more in common than they thought. This could involve exploring their pasts and how they ended up in their current situations in the RWBY universe.
One common theme is adventure. Since RWBY is set in a world full of danger and mystery, fanfictions often have the OC and Coco going on exciting adventures together, like exploring uncharted areas or fighting new Grimm.
Another theme is redemption. Sometimes, the OC tries to bring out a better side of Cinder. This could involve the OC showing Cinder kindness or understanding in a world that has been cruel to her. It's about changing Cinder's path from a villainous one. And also, the theme of loyalty often comes up. The OC may be forced to choose between loyalty to Cinder or to other characters they care about, creating moral dilemmas and conflicts within the story.
One common theme is self - discovery. The male OC often has to figure out his place in the RWBY world, his powers, and his purpose. For example, in many stories, he starts off not knowing much about his abilities but as the story progresses, he uncovers hidden potential.