She would be a disruptor. Bellatrix's unpredictable and violent nature would immediately set her apart in the Game of Thrones world. She might not play by the political games' rules and just use her dark magic to get what she wants.
Bellatrix could find herself in the middle of the power struggles in Westeros. She may side with the most ruthless characters, like the Lannisters, because they share a similar thirst for power. Her skills in combat, which in the Harry Potter world are enhanced by magic, would give her an edge in battles in Game of Thrones. However, her loyalty to her own beliefs and her 'master' in the Potter world could lead to some interesting conflicts within the alliances she forms in the new world.
In a fanfic, Bellatrix would bring a new kind of magic to the Game of Thrones universe. Her knowledge of the dark arts could be both feared and coveted. She might be seen as a threat by some of the more traditional magic - users in Westeros. At the same time, her insanity could make her actions hard to predict. This could lead to some very unexpected story developments. For example, she could start a war between two kingdoms just because she felt like it or because she thought it would benefit her in some way.
The Basilisk could be a fearsome weapon. A powerful lord might capture it and use it to strike fear into his enemies. Just like how dragons are used in Game of Thrones, the Basilisk could be a game - changer in battles.
A Wendigo could be a dark and mysterious addition. It could be part of a new threat that emerges from the Forbidden Forest. The magical creatures in the forest might be afraid of it, and it could start preying on students who wander too far. Harry and his friends would need to use spells like the Patronus to protect themselves.
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.
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.
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.
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.
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.
Well, Harry Potter would be a very different character in the Game of Thrones world. He'd probably have to deal with the complex politics there. Maybe he'd use his magic to outwit the scheming lords and ladies. He might also form alliances with some of the more honorable characters like Jon Snow. Magic could be seen as a powerful but also very dangerous tool in Westeros, so he'd have to be careful not to draw too much attention to himself.
Well, imagine if the ancient starship had some sort of artificial intelligence still active. In the Game of Thrones world, this would be seen as some kind of powerful spirit or demon. The AI could start influencing the events in Westeros, maybe by giving advice to certain characters. It could choose those who it thinks can bring about a new order or simply those who can help it repair itself. And this would create a whole new layer of intrigue and power struggles.
In a fanfic, the bug demon mate could be a part of an ancient prophecy in the Harry Potter universe. It might be foretold that a bug demon and a wizard (Harry) would come together to bring balance. The bug demon's nature could be a contrast to the more civilized wizarding society. It could introduce a wilder, more unpredictable side of magic. Also, it could have its own set of enemies within the magical world, which could draw Harry into new conflicts and adventures.