Well, if Ned married Cersei, it might have changed the course of many events. Their opposing natures and loyalties could have caused chaos within the realm. It could also have affected the relationships of other characters in unexpected ways.
The Lannisters, apart from Cersei, could be antagonists. Jaime might see Ned as a threat to his relationship with Cersei and try to undermine the marriage. Tywin Lannister could also be against it as he has his own political plans that don't involve Cersei being married to a Stark. He might try to find ways to dissolve the union.
It could have led to a very different power dynamic in Westeros. Maybe Robert would have been more controlled by Cersei, or their relationship could have sparked more political upheaval.
One possible plot could be a political alliance that forms between Cersei and Ned. They might initially be at odds but gradually come to respect each other's political acumen. They could work together to fend off common enemies in King's Landing, and in the process, their relationship could develop into a complex mix of friendship and something more, with both having to navigate the tricky waters of loyalty to their respective houses.
It could have led to a very different power dynamic in Westeros. Maybe Ned's honor and Cersei's ambition would have clashed constantly.
Well, if Ned Stark married someone else, it might have changed the fate of his children and their relationships within the realm. It could have also affected his alliances and political strategies.
Well, if Elia Martell married Ned Stark, it might have changed the course of many events. Their combined influence could have shaped a more peaceful or at least a differently chaotic kingdom. Also, the relationships among the noble houses might have been very different.
Well, for one, the Lannister influence might not have been as strong. Also, the fate of Robert's children and the succession to the throne would likely have changed drastically.
Well, it could have led to a completely different power dynamic in Westeros. Maybe Ned would have made different alliances or faced more challenges alone.
Well, it would be a very different story. Their marriage might force the Starks and Lannisters to work together more closely. But Ned would be constantly aware of Cersei's true nature. He might try to keep her in check, which would make her resent him. And the whole Robert's Rebellion backstory would have a different feel. Since Ned was so close to Robert, his marriage to Cersei would add a strange layer of complexity to that relationship. It could also potentially change the fates of their children, as they would be part of a combined Stark - Lannister family.
The challenges would be many. Politically, their marriage would be a strange alliance. The Starks and Lannisters have different agendas. Ned would want to rule justly and fairly, while Cersei is only interested in power for herself and her family. Emotionally, they are polar opposites. Ned is a loving father and a man of principle. Cersei is a complex character, often driven by jealousy and greed. Her relationship with Jaime is a major hurdle. And Ned would have a hard time trusting Cersei, given her reputation for underhandedness. Their marriage would be like mixing oil and water in the world of fanfiction.