One plot idea could be that the Baratheon OC is a long - lost relative who comes to claim a part of the Baratheon inheritance. Robb Stark gets involved as he has political interests in the Baratheon realm. They start off as rivals but gradually develop a mutual respect as they face common enemies.
A possible plot is that the Baratheon OC is a young noble who is betrothed to someone in Robb Stark's court. However, the OC has their own ideas about loyalty and love. Robb and the OC end up in a complex relationship as they navigate the political and personal implications of the betrothal, all while the wars and power plays in Westeros continue around them.
One idea could be an OC Baratheon who is a long - lost cousin. This OC could come to King's Landing with a claim to the throne, causing political unrest among the existing Baratheon claimants. He or she might have unique skills, like being an expert in naval warfare, which was important for the Baratheons. Another plot could involve an OC Baratheon woman who disguises herself as a man to fight in the wars, and along the way, she discovers secrets about her family's past that could change the course of the Baratheon legacy in Westeros.
One idea could be the OC's struggle to prove himself worthy in the eyes of his father, Stannis. He might face challenges like being overshadowed by his father's more well - known followers. Another plot could involve the OC getting involved in the power struggles of Westeros, trying to uphold his father's claim to the Iron Throne while also forging his own path. Maybe he discovers a hidden secret about his family that changes everything.
Perhaps a female Robb Stark and Theon are forced into an arranged marriage as part of a political alliance between the remaining Starks and some of Theon's supporters. At first, they resent each other due to their past differences. But as they start to understand each other's motives and the greater good they are working towards, they fall in love. They then have to deal with the internal politics of their newfound union and fend off enemies who want to break them apart.
At first, their relationship would be full of hostility. The Baratheon OC would see Robb as a threat to their side's victory, and Robb would view the OC as an enemy. But as the war progresses, they might start to see the humanity in each other. For example, if the OC saves one of Robb's men from certain death, it could plant a seed of doubt about the other side being all bad.
One great 'Robb Stark OC fanfiction' is 'The North's New Hope'. It has an original character who becomes an important ally to Robb. The story is full of political intrigue and battles, just like in the original 'Game of Thrones' setting.
One idea could be that the OC is a healer from a far - off land who comes to Winterfell. Sansa is initially suspicious but as she sees the OC's kind heart and skills in treating the wounded, she warms up. The OC could also have some secrets about a possible threat coming to the North that they share with Sansa, and together they start to prepare for it.
One idea could be that the male OC is a foreign noble who comes to Winterfell. He has unique fighting skills and Arya is intrigued. They start training together in secret, and as they do, a deep bond forms. This could lead to them going on adventures together, facing threats to the North.
Another plot could revolve around her discovery of a long - hidden family secret. Maybe she finds out that there is some hidden claim to the Iron Throne within her family's past. This could lead her on a journey to uncover the truth, facing many obstacles along the way, including those who want to keep the secret buried. She might have to outwit her own family members who fear the consequences of this secret getting out.
One aspect to consider in this fanfiction could be the clash of cultures between the Baratheon and Stark families. Since Robert is a Baratheon and the OC is a Stark, their relationship might be shaped by the different values and traditions each family holds. For example, the Starks are known for their loyalty and honor, while the Baratheons can be more power - hungry. This could create interesting dynamics in the story, such as how they handle political situations together or how they resolve conflicts that arise from their family differences.
The OC Baratheon might be a bastard son in this fanfiction. He is looked down upon by his own family but Sansa Stark sees his worth. They team up to fight against the tyranny of a cruel king. Sansa provides the political acumen and the OC Baratheon brings his skills as a warrior. Their alliance is unexpected but proves to be a strong force for change in Westeros.