His character could develop in terms of his relationships. He might start to value loyalty and honesty more, especially in his friendships and marriages. This could lead to him making different choices in who he surrounds himself with. For example, he may choose to have more true friends rather than just political allies.
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.
Perhaps a plot point could involve his relationships. If he is reborn, he may handle his marriage to Cersei Lannister differently. He could try to build a more genuine relationship with her or find a way to avoid the animosity that was there before. This would have a huge impact on the political and family dynamics in Westeros.
One idea could be a story where Robert Baratheon discovers Jon Snow's true parentage earlier. This could lead to a complex relationship where he sees Jon as a potential heir or a powerful ally. He might take Jon under his wing, train him in the ways of leadership and warfare, much like he did with Ned Stark's other children.
Power is a common theme. Fanfictions often explore how Robert wields his power as king, whether he uses it wisely or misuses it. Another theme is love and lust, like his relationship with Cersei and how that affected his rule.
Good fanfiction about Robert Baratheon also needs to capture the essence of the world he lives in. It should include the political intrigue, the power struggles, and the cultural aspects of Westeros. If it can tie in his actions as king with the greater political landscape, like how his decisions affected the different houses, it makes for a great read. Also, delving into his vices, like his drinking problem, and how it impacts his rule and those around him is a plus.
It could have changed the entire course of events. Maybe there would have been less conflict and more stability in the kingdom.
If Robert Baratheon loved Cersei, it might have changed the course of many events. Their relationship could have affected how they ruled, and potentially influenced the fates of other characters. Maybe there would have been more harmony within the royal family.
A great Robert Baratheon OC fanfiction often has a well - developed original character. For example, an OC with a unique backstory that can interact meaningfully with Robert's character. Also, it should be set in the rich world of Westeros and follow the general tone of the original series.
One great 'female Robert Baratheon' fanfiction is 'The Queen That Could Have Been'. It explores an alternate universe where Robert is born as a female. The story delves into how she would handle the politics of Westeros differently from the male Robert. It has interesting character developments and unique plot twists that keep you engaged.
One common theme is his youth and the development of his strength. Writers often explore how he built his physical and mental might.