One common theme is the clash of different worlds. Since McCree is from Overwatch and RWBY has its own unique universe, many fanfictions explore how he adapts to this new world. For example, dealing with the Grimm, which are very different from the threats in his original world.
Another theme is friendship. Often, McCree forms bonds with the RWBY characters. He might become friends with Ruby, Weiss, Blake or Yang. These friendships are often tested through battles and difficult situations, which makes for an interesting read.
Power and combat is also a common theme. McCree has his own set of skills from Overwatch, and in RWBY fanfictions, we see how these skills compare and interact with the combat abilities of the RWBY characters. Some fanfictions focus on training sessions where they exchange techniques and learn from each other.
One common theme is the exploration of McCree's character in a different gender context. Writers often look at how a female McCree would interact with other characters, especially in terms of relationships. Another theme could be her place in the Overwatch team as a female. It might involve her proving herself in a male - dominated environment.
One common theme is loyalty. Given their shared past and the nature of their characters in the Overwatch lore, many fanfictions explore how they remain loyal to each other or to their causes. For example, they might have to choose between personal loyalty and a greater good.
Protection is also a major theme. McCree feels the need to protect Mercy from the dangers of the world they live in, while Mercy protects McCree in her own way, by healing his physical and sometimes emotional wounds.
Another theme is the contrast between their personalities. Genji is more of a reserved, yet spiritually - inclined character, while McCree is more of a rough - around - the - edges cowboy type. Fanfictions often play on this contrast, showing how they complement each other and learn from one another as their relationship progresses.
One common theme is adventure. McCree is often depicted as a gunslinger with a lot of experience, so going on adventures together is a popular plot. For example, they might go on a mission to take down a group of bad guys in the wild west - like setting.
One common theme is loyalty. Given their different allegiances in the Overwatch universe, many fanfictions explore how they deal with their loyalty to their own causes while being in a relationship. For example, Ashe has her gang and McCree has his own code of honor.
One common theme is redemption. McCree and Hanzo both have complex pasts, and many fanfictions explore how they find redemption through their relationship. Another theme is trust. Since they come from different backgrounds in the Overwatch world, building trust is a big part of their stories.
One common theme is redemption. Hanzo often has a past he's trying to atone for, and mccree can be a part of that journey. For example, in many fanfics, mccree helps Hanzo see that he can move forward from his past mistakes.
A common theme is the clash and then the melding of their different cultures. McCree represents the wild west sort of cowboy culture, while Hanzo has his traditional Japanese heritage. Their fanfics often explore how these two different worlds come together.
One common theme is the contrast between McCree's rough exterior and Mercy's gentle nature. Another is the idea of them finding solace in each other in the midst of a chaotic world. Also, the theme of protection often comes up, with McCree protecting Mercy or vice versa.