One possible plot could be that Harry, as the son of Robert Baratheon, grows up in a world where the wizarding and non - wizarding realms are more intertwined. He might face challenges from both the magical politics and the power struggles of the Seven Kingdoms. Maybe he'd use his magic to help resolve some of the disputes in Westeros, all while dealing with the secrets of his dual heritage.
Perhaps the story could focus on Naruto growing up in the court of King's Landing. He would face the political intrigue there, which is very different from the world he knew in the Naruto series. His ninja training might give him an edge in dealing with the backstabbing and power - hungry nobles, while also trying to understand his new identity as Robert Baratheon's son.
He would be more aggressive. As a Baratheon, he'd inherit that family's bold and sometimes brash nature. Instead of the somewhat reserved Harry we know, he'd be more likely to take immediate action, whether in a duel or in dealing with a problem at Hogwarts.
Perhaps their relationship begins with curiosity. Daenerys has heard of the powerful Robert in Westeros, and Robert is intrigued by this Targaryen with a claim to the Iron Throne. As they communicate more, they find common ground in their desire for a just Westeros. They might start to fall in love slowly as they share their dreams and fears, and work towards building a better future for the Seven Kingdoms.
His abilities might be a blend of his ninja skills and the more 'mundane' skills expected of a noble in Westeros. For example, he could use his shadow clone jutsu to attend multiple court meetings at once, while also learning how to joust or fight with a sword like a true Baratheon.
If Robert Baratheon married in fanfiction, it might result in new alliances and conflicts. His choice of partner could shape the political landscape and introduce fresh storylines. Also, it could affect his relationships with other characters in unexpected ways.
If Robert Baratheon married Cersei in fanfiction, it's possible that their children's fates would be different. Also, it might affect the alliances and rivalries among the noble houses. The story could take many unexpected turns based on this alternate setup.
One great fanfiction could be about the Oc Son of Robert Baratheon trying to claim his rightful place in the Iron Throne. Maybe he has to face off against his siblings or other claimants. It could explore his character development as he discovers the truth about his father's actions and how it affects his own claim.
In some fanfictions, the Oc Son of Robert Baratheon is a key figure in a war that breaks out. He might be on the side of the Starks against the Lannisters or vice versa. His actions and decisions in the war could change the course of the entire conflict, and his relationships with other important characters during the war, like Jon Snow or Tyrion Lannister, would be fascinating to explore. It could be a story of loyalty, betrayal, and strategic warfare.
A possible plot twist might be that Naruto, being the son of Robert Baratheon, has to choose between the values of the ninja world he grew up in and the cut - throat politics of Westeros. He could also have some unique ability inherited from his Baratheon side that changes the whole dynamic of battles in the Naruto - like battles that might occur in this crossover world.
A plot could be that Robert Baratheon, in his later years, starts to question the legitimacy of the current power structure. He meets Jon Snow, who has a mysterious allure about him. They start to exchange ideas about honor and leadership. Robert realizes that Jon has a different kind of wisdom, born from his experiences at the Wall. This leads to a journey together where they try to find a new way to rule the Seven Kingdoms that is more just and inclusive.