The power dynamics play a big role. Ruby has her own unique abilities with her scythe and semblance, and Adam has his sword skills and semblance too. How they use their powers in relation to each other, whether in combat or cooperation, is important in the fanfic.
You can try some popular fanfic websites such as Archive of Our Own (AO3). It has a large collection of RWBY fanfics, and you can easily search for 'rwby adam x ruby fanfic' using the search bar. There are likely to be many different takes on this pairing there.
One popular 'rwby adam x ruby fanfic' might be those that explore the complex relationship between Adam and Ruby in a non - romantic way, like a story where they have to team up against a common enemy. This could show their different fighting styles and how they gradually come to respect each other.
The relationship development between Adam and Ruby in fanfiction is quite complex. At first, Adam's past actions and his affiliation with the White Fang make Ruby view him with suspicion and fear. But Adam, on the other hand, might be intrigued by Ruby's power and innocence. As the story unfolds, there could be events like Adam saving Ruby's life or Ruby showing Adam kindness when he least expects it. This exchange of unexpected actions starts to break down the barriers between them. They might then start to share their dreams and fears. Over time, through these shared experiences and emotional exchanges, their relationship moves from animosity to a potential romantic relationship. For instance, in some fanfictions, they might go on a mission together where they have to depend on each other completely, and this deepens their bond.
Another good one is 'The Meeting of Ruby and Adam'. In this fanfic, the author focuses on the initial encounter between Ruby and Adam. It describes their first impressions of each other in great detail, and then slowly builds up the relationship as the story progresses, with some exciting action scenes along the way.
There's also 'A Different Path'. In this fanfiction, Ruby stumbles upon Adam during a solo mission. Instead of fighting immediately, they start a conversation that leads to a series of events where they start to understand each other's motives and pasts, which ultimately changes their relationship in an interesting way. It delves deep into their characters, showing how they might interact outside of the main storyline's animosity.
When writing their interaction, remember Adam's complex past. He has a lot of anger and resentment. Ruby, on the other hand, is very optimistic. So, their conversations could start with Adam being dismissive or even hostile, while Ruby tries to be friendly. For example, Ruby might say 'Hi, Adam! I think we could be great allies!' and Adam could reply 'I don't need your help, little girl.'
One popular story might be 'The Unlikely Bond'. In this fic, Adam and Ruby start off as enemies but gradually find common ground through their shared experiences in the fight against Grimm. Another could be 'A Different Path' which explores a world where Adam decides to change his ways early on and forms an alliance with Ruby that turns into a deeper relationship over time. There's also 'The Meeting of Souls' where their destinies seem intertwined in a way neither expected, leading to a unique and complex relationship development.
You should also consider the setting. If it's in Vale or some other part of Remnant, use the existing lore to add depth. For instance, if they are in a forest near Vale, describe how the Grimm in the area affect their interactions. Also, dialogue is key. Ruby might be more open and curious, while Adam could be more guarded. Show their personalities through their conversations. And don't forget about the action scenes. Since they are both fighters, choreograph some exciting battles that also serve to develop their relationship further.
Another theme could be self - discovery. Through their interactions, both Adam and Ruby could learn more about themselves. For instance, Adam might discover a softer side of himself because of Ruby, and Ruby could find new strengths within herself while being with Adam.