One way is to have the clone trooper be a time - traveler. Maybe some sort of experimental technology sends a clone trooper from the Star Wars universe to the world of RWBY. He could bring his advanced combat skills and unique weaponry, like the blaster, and then have to adapt to the new world with its Grimm and Dust - based combat.
Well, there's a fanfic called 'Clone Trooper Allies in RWBY'. In this one, the Clone Troopers form an alliance with the RWBY characters to fight a common enemy. It shows how their different combat styles and strategies blend together. For example, the precise and disciplined fighting of the Clone Troopers combined with the unique Semblances of the RWBY characters makes for some exciting battle scenes.
Writers blend these two concepts by creating crossovers in the plot. They might start with a portal or some kind of interdimensional rift that brings the Clone Troopers to the RWBY world. Then, they explore how the Clone Troopers' loyalty and discipline contrast with the more individualistic nature of the RWBY characters. In terms of world - building, they can incorporate elements of the Clone Troopers' technology, like their ships and armor, into the RWBY setting. This not only creates an interesting visual but also new story possibilities. For example, a Clone Trooper ship could be used to transport RWBY characters to a new location or be a base of operations against a common threat.
Well, they would have their military training skills for sure. They are highly disciplined and trained in various forms of combat. In RWBY, this could translate to being able to quickly assess battle situations and come up with strategies. Also, their physical strength and endurance would be an asset. They could hold their own in a fight against Grimm or other adversaries.
Naruto would probably be very curious about the clone trooper culture. He might be shocked at first by the fact that they are all clones. But his friendly nature would make him quickly start making friends among the clone troopers. He would try to understand their military structure and how they operate as a unit.
First, decide which two universes you want to cross over. If it's clone troopers and, say, the Halo universe, research both. Know the characteristics of clone troopers like their training, loyalty, and combat skills. Then, think of a starting point. It could be something like a wormhole opening and transporting clone troopers to the Halo world.
In RWBY fanfiction, the SPAS - 12 could be incorporated in various ways. It might be a weapon used by a character in a non - canon battle scenario. For example, a villain could obtain it and use it against the RWBY team, adding an unexpected element to the fight. Another way could be that a weaponsmith in the RWBY universe tries to reverse - engineer the SPAS - 12 to create a new type of weapon for the Huntsmen and Huntresses.
Another option is to look for specialized Star Wars fanfiction groups or forums. These are places where die - hard fans gather and share their creative works. They might have a section specifically for 'oc clone trooper' fanfiction. You can also ask the members directly if they know of any good ones.
One way could be by creating a character with a unique immune system ability. For example, a character who can heal rapidly due to an enhanced immune system, which could be a result of some experiment or natural mutation in the RWBY universe. This could add an interesting dynamic to battles and storylines.
You could also incorporate the concept of honor from 'For Honor' into the RWBY universe. RWBY already has its own code of conduct among the Huntsmen and Huntresses. But by adding the 'For Honor' idea of honor, it could be more complex. For example, a character might struggle between the RWBY - style honor of protecting the weak and the more strict, traditional honor from 'For Honor' that might involve duels and vendettas.
First, think about your OC's personality. Are they a serious and by - the - book trooper or a more rebellious one? Then, decide on their backstory. Maybe they were part of a special training program or had a unique encounter that shaped them. After that, consider how they fit into the Clone Trooper world. Will they be in a specific battalion? These are the basic steps to start writing.