Maybe Harry Potter, being aware of Ned Stark's situation through some sort of magical connection or prophecy, travels across dimensions to Westeros. He then uses his invisibility cloak to sneak Ned out of a dangerous situation, like the moment he's about to be executed.
Well, perhaps Harry Potter uses his magic skills like the Patronus charm to fend off the enemies who are about to harm Ned Stark. He could apparate Ned to a safe place just in time.
Harry Potter would likely be in awe of Ned Stark's sense of honor and leadership. Ned, on the other hand, would be initially suspicious of this strange boy with magical powers. But as Harry uses his magic to save him, Ned would start to trust him.
Another idea is that Arya uses her skills in a completely new and unexpected way. Instead of relying on her typical stealth and combat skills, she might use her wits to manipulate the situation. For instance, she could spread false rumors among the captors that would cause chaos and confusion, allowing her to slip in and save Ned.
The Lannisters as a whole could be the antagonists. They were often at odds with the Starks and had their own political ambitions. Cersei, in particular, might be pulling the strings behind Ned's capture, seeing him as a threat to her power and her children's claim to the throne.
One interesting plot point could be how Harry, with his knowledge of magic, might introduce new elements to the world of Westeros. For example, he could use magic to heal the sick in a way that is not common in that world. Another point could be his interactions with the Stark family. Since he is reborn as Ned Stark, he would have a different dynamic with his children compared to the original Ned Stark, perhaps being more open - minded due to his past as Harry Potter. Also, his approach to the political intrigue in Westeros might be different. He might use some of the strategies he learned in the wizarding world to deal with the power struggles in the Seven Kingdoms.
Perhaps the plot could involve the two coming together to fight a common enemy. The Targaryen might bring her dragons (assuming this is in a universe where dragons exist in this fanfiction) and Ned Stark could bring his military might and the loyalty of the North. Their marriage could be a strategic alliance that was initially arranged for political reasons but then they grow to love each other. They would then have to navigate the power struggles in Westeros, with many houses vying for control.
The plot could center around the cultural clash between the two families. The Lannisters are known for their cunning and wealth, while the Starks are more about honor and loyalty. So, when a Lannister marries Ned Stark, there would be a lot of adjustments. The Lannister in the marriage might try to bring in their lavish lifestyle, which could be resisted by Ned Stark at first. But over time, they could learn from each other. The Lannister could become more honorable, and Ned Stark could understand the importance of some political maneuvering.
In this fanfiction, perhaps the centaur is in a situation where it's about to be sacrificed in some dark ritual. Harry discovers this and races against time to stop it. He calls upon his friends Hermione and Ron for help. Hermione uses her vast knowledge of magic to figure out how to break the dark magic circle, while Ron provides some much - needed comic relief during the tense situation. Harry, of course, is the one who ultimately uses his powerful Patronus charm to dispel the dark forces and save the centaur.
Well, perhaps Zoe is in danger from dark wizards. Harry, with his skills and bravery, could use spells like Expelliarmus to disarm the villains threatening Zoe. He might also use his invisibility cloak to sneak up on them.
The fanfiction could show that Harry discovers a secret passage that leads to where Cedric is held captive. He has to face various magical traps and challenges on the way. Once he reaches Cedric, he uses his Gryffindor courage and his knowledge of magic, like the Shield Charm to protect Cedric from incoming spells, and then they escape together, with Harry being the hero who saves Cedric.
One possible plot could be that Harry, through some magical accident or powerful spell, is transported to the world of Cintra. There, he discovers the danger it's in. Using his magical skills like the Patronus charm to ward off dark creatures threatening Cintra, and his knowledge of spells to help in battles. He might also form alliances with the local warriors, teaching them some basic magic for self - defense.