He might play the role of a mentor. Imagine Goku teaching young Jedi or Rebels how to fight without relying solely on the Force or blasters. He could show them how to use their inner strength and physical abilities to the fullest. This would be a new approach in the Star Wars world where most combat training is centered around the Force. Also, his experience in fighting powerful foes from his own universe would give him a lot to share.
Goku could be a hero who saves the day. For example, when the Rebels are facing a powerful Sith Lord, Goku shows up and uses his Ultra Instinct to defeat the enemy. His pure - hearted nature would make him a natural ally of the good guys in the Star Wars universe.
It could be a source of new allies. Earth has a large population, and if the people of Earth were to be introduced to the Star Wars universe, some of them might be Force - sensitive or have skills that could be useful. They could join the Rebellion or the Empire, depending on their motives. For example, Earth's military strategies and technologies could be adapted to the Star Wars setting. The use of Earth - based guerilla warfare tactics could give the Rebels an edge in some battles.
In Star Wars fanfiction, Starkiller could potentially be a rogue agent during the Clone Wars. He might use his unique Force abilities to either interfere with the plans of the Sith or try to find his own path in the chaos of the war. Maybe he teams up with some Jedi who see his potential for good, despite his dark past or training.
He could be a mentor figure. Goku has a lot of experience in fighting powerful enemies and growing stronger. He could teach the demigods in Percy Jackson's world some new combat techniques.
He might be a disruptor. His overpowering strength and different fighting style could shake up the existing power structures in the Naruto universe. He could also be an explorer, coming from his own universe and being curious about the Naruto world, which could lead to many adventures and interactions with different characters.
He could be a mentor. Given his vast combat experience and his ability to master different techniques, he could guide the young heroes in My Hero Academia. Just like how he was trained by Master Roshi and others, he could pass on his knowledge to the likes of Izuku or Bakugo.
Noble Six could be a smuggler. They would use their skills to navigate dangerous routes and outwit the Empire's patrols, much like Han Solo. Their backstory could be that they were once a part of a military unit but turned to smuggling after some events in their past.
Tony Stark could play the role of a mentor. He could teach the younglings in the Jedi Temple about technology and how to think outside the box. He'd show them how to use their surroundings to build things that can help them in their battles. He could also introduce concepts like artificial intelligence, but in a way that doesn't conflict with the Force - based beliefs of the Star Wars universe.
In Star Wars fanfiction, Draco could play various roles. He might be a new type of Sith apprentice, bringing his own brand of cunning and ambition to the dark side. For example, he could be involved in power struggles within the Sith hierarchy, using his political savvy from his original story context.
The Bendu in fanfiction could also be a sort of mediator. Since it doesn't side with the light or dark side completely, it might try to bring balance in a more direct way. It could interact with characters from different factions, like a Jedi who is struggling with the temptations of the dark side and a Sith who is starting to question their path, guiding them towards a new understanding of the Force.
In some Star Wars fanfiction, America might play a role in the technological aspect. American technological achievements could be translated into the Star Wars world. For example, the idea of American space exploration might inspire how a particular species in the fanfiction approaches space travel. Or the concept of American military technology could be adapted to create new weapons or defenses in the fictional Star Wars setting.