Smaug could potentially be a part of the magical elements in the 'Game of Thrones' fanfiction. He could be connected to the old magic that once existed in Westeros. Maybe his presence awakens other dormant magical forces. His actions could also influence the political landscape. For example, if he attacks a certain region, the lords there would have to divert their resources from the power struggles to deal with the dragon threat, which in turn could give an advantage to other houses.
Kakashi could fit in as a foreign warrior. He could bring his ninja techniques which would seem like magic to the people of Westeros. His stealth and combat skills would make him a valuable asset or a feared opponent in the battles and power plays of the Seven Kingdoms.
For Sakura, she could be a healer in the Game of Thrones world. With her medical ninjutsu skills, she could treat the wounded from dragon attacks or battles. And she might also learn some of the local magic to enhance her healing abilities, all while having to deal with the political intrigue and power struggles that are so common in the Game of Thrones universe.
Link would be an outlier in the GoT world. He's used to a more straightforward good - vs - evil dynamic. But in Westeros, he'd have to navigate the complex web of politics. He could probably be a great warrior in the service of a noble house, but his simple and pure-hearted nature might make him a target for the more devious characters. Zelda could be a powerful sorceress, perhaps on par with Melisandre, but with her own goals and a different moral compass.
Smaug would probably see most of the Game of Thrones characters as either insignificant or as potential thieves of his treasure. He might interact with the more powerful ones, like Daenerys, with hostility as she also has dragons. He would likely view her as a rival for dominance in the skies.
Madara Uchiha is a very powerful and complex character. In a Game of Thrones fanfiction, his skills as a powerful ninja would be quite extraordinary in the Westeros setting. He could potentially be a great warrior or a feared sorcerer - like figure. His Sharingan ability might be seen as some form of dark magic in Westeros. Maybe he would be a lone wolf type of character, not really aligning with any of the existing houses but rather forging his own path in the power struggles, much like he did in the Naruto universe.
The Hulk might be seen as a sort of monster in the context of Game of Thrones. Just like how they have direwolves and dragons, the Hulk could be another mythical - but in this case, suddenly very real - creature. He could be shunned by some and perhaps worshipped as a god by others, depending on how different regions of Westeros react to his existence.
The Dragonborn could potentially fit into the Game of Thrones universe in several ways. One way is through their dragon - related abilities. In Game of Thrones, dragons are a powerful and rare force. The Dragonborn's natural affinity for dragons could make them a valuable ally or a feared enemy. They could perhaps form alliances with the Targaryens, who also have a strong connection to dragons. Another aspect could be their combat skills. The Dragonborn is often a skilled warrior, and in the brutal world of Game of Thrones, such skills would be highly sought after.
In fanfiction, Aragorn could potentially be a king from a far - off land who arrives in Westeros. He might bring with him a different style of leadership and a sense of honor that is somewhat different from the lords and ladies of Westeros. He could get caught up in the power struggles, especially if he realizes the threat of the Iron Throne being misused. Maybe he would try to form alliances with the more noble houses to bring stability to the land.
Legolas could be an outcast in the Game of Thrones world at first. But as he gets to know the people and their struggles, he decides to get involved. He could start a new movement, based on elven values like harmony with nature and loyalty. His actions could inspire characters like Jon Snow to think differently about leadership and ruling, and together they could work towards a more just and sustainable Westeros.
In a fanfic, the Assassin's Creed elements could create some really interesting storylines. The idea of a hidden brotherhood operating in the shadows of Westeros would add a new layer of mystery. They could have their own goals, such as protecting a certain bloodline or preventing the misuse of magic. And their technology, like the hidden blades and the use of smoke bombs, would be a novelty in the medieval - like setting of Game of Thrones. This could lead to some really cool scenes where they use their gadgets to outwit their enemies and make their mark in the complex world of Westeros.