She could be a healer. With her knowledge of medical ninjutsu, she could save many lives in the war - torn Westeros. This would make her a valuable asset to any side she chooses to support.
He could be a heroic figure. For example, he could be like a knight - errant, traveling around Westeros and helping those in need. His swordsmanship, which is quite different from the traditional Westerosi style, would make him a unique combatant.
Wolverine might be a disruptor in the Game of Thrones world. He doesn't follow the same rules as the Westerosi. His presence could change the way battles are fought. For example, in a large - scale battle like the Battle of the Bastards, his individual combat skills could turn the tide. He could cut through enemy lines with his claws and inspire the troops he's fighting alongside. He might also be a voice of reason among the power - hungry lords, as he has his own sense of right and wrong that is different from the political games in Westeros.
A professional army could act as a protector. For instance, they could safeguard a small town or a noble family from bandits or rival houses. They would be more reliable than a conscripted or mercenary force.
Hashirama might become a powerful ally or a feared enemy in the Game of Thrones fanfiction. If he aligns himself with a certain house, his powers would make that house very difficult to defeat. He could also be a lone wanderer, using his skills to help the common folk. For instance, he could use his wood - style jutsu to create shelters for the poor or to clear paths in the forest for travelers. He would be like a force of nature in the world of Westeros, disrupting the normal power dynamics.
Smaug could be a terrifying and powerful antagonist. He could be lured to Westeros by the smell of gold and riches in the various kingdoms. His ability to fly and breathe fire would make him a formidable foe against any army or dragonriders in the Game of Thrones universe.
He could be a rebel. Tired of the Bolton family's traditional ways, he might try to change the family's reputation. He could be a force for good in the North, protecting the smallfolk from the usual Bolton brutality.
He could play the role of a master strategist. Thrawn's ability to analyze his opponents and predict their moves would make him a valuable asset to any side in the 'Game of Thrones' power struggles. He could be the one to turn the tides in battles and sieges.
In a Game of Thrones fanfic, Frederick the Great could be a foreign invader. He'd come from across the sea with his well - trained armies. His arrival would disrupt the status quo. The existing lords and ladies would have to decide whether to fight him or ally with him. His goals could range from conquest to simply finding a new place to establish his own kingdom, and his actions would have a huge impact on the story.
He could also play the role of a healer. In a world full of wars and diseases, a male OC with exceptional healing skills would be very valuable. He could be in a small town when a plague breaks out. He uses his knowledge of herbs and ancient healing techniques to save as many people as he can. This would make him a hero in the eyes of the common people, and perhaps catch the attention of a powerful noble who wants to use his skills for their own purposes.
Harry might play the role of a mediator. Given his experience with different kinds of conflicts in his own world, he could try to bring peace between warring houses. However, his methods might be seen as strange or unorthodox in the context of Westeros. He could also be a catalyst for change, inspiring new ways of thinking about magic and power in the land.