Well, he could end up being a rival to some of the noble houses in Westeros. Maybe he'd use his Slytherin cunning to try and gain power. He might start off as an outcast, just like he was at Hogwarts, but gradually find a way to insert himself into the political games of the Seven Kingdoms.
One possible storyline is that Draco gets involved in the fight against the White Walkers. His wizarding skills could be a great asset. He might initially be skeptical about the existence of such creatures, but once he realizes the threat they pose, he could use his dueling skills and knowledge of defensive magic to help the people of Westeros. He could also teach some of the locals how to better defend themselves against dark forces, similar to how he was taught at Hogwarts.
He could form an alliance with the maesters. Draco is quite intelligent and has an interest in knowledge. In the GOT world, the maesters hold a lot of secrets and power. He might use their knowledge of magic (albeit different from the magic in the Harry Potter world) to his advantage, perhaps even try to create new spells or potions using the resources available in Westeros.
His Slytherin pride and ambition would make him a natural fit in the cut - throat world of Westeros. He'd likely be drawn to the power struggles and would try to climb the social ladder. Just like in the Harry Potter series, he'd probably look down on those he considers beneath him.
One unusual storyline in Severus Snape and Draco Malfoy fanfiction could be a time - travel plot. Imagine Draco accidentally travels back in time and meets a much younger Snape. This could lead to all sorts of interesting interactions as Draco has knowledge of Snape's future and Snape is just a young, bullied student. They might form an unexpected alliance and Draco could try to change Snape's fate for the better.
Often, Draco is made into a good guy through a time - travel plot in fanfiction. He goes back in time and gets a chance to redo his actions. This time, he makes different choices, like befriending Harry Potter from the start and working against the Dark side. It's a popular way to rewrite his character as a positive one.
One possible plot is that Draco Malfoy discovers he has a non - pureblood ancestor through some ancient family records. This shatters his view of his family's pureblood lineage. He then struggles with whether to keep this a secret or reveal it, fearing the reaction from his family and the pureblood society at Hogwarts.
One common storyline could be Draco finding a Pygmy Puff and being surprisingly gentle with it. Maybe he discovers a lost Pygmy Puff in the Hogwarts corridors and decides to take care of it secretly. This shows a different side of his character, softer than the one he usually presents to his Slytherin friends.
One possible fanfiction storyline is that Draco Malfoy and Rose Weasley are both selected for an international wizarding competition. They have to represent Hogwarts against students from other magical schools. Draco is chosen for his dueling skills and Rose for her knowledge of ancient magic. At first, they are not happy about being on the same team. However, as they train together, they realize that they can learn a lot from each other. Draco teaches Rose some Slytherin - style dueling tactics, and Rose helps Draco understand the more theoretical aspects of magic. Along the way, they also face external challenges from rival teams who try to undermine their efforts, which only makes them grow closer as teammates.
Well, some fanfictions might focus on the OC's pregnancy being a secret at first. She has to hide it from not only the Malfoy family but also from her own friends or family in the wizarding world. This could lead to a lot of tense moments, like nearly being discovered during a big wizarding event. And Draco could be in a difficult position, trying to keep up his family's image while also caring for the OC.
In many fanfictions, Draco could be injured during a duel. He is a Slytherin, and duels are common in the wizarding world. Maybe he underestimates his opponent and gets seriously hurt.
A plotline could involve Draco's family trying to hide his non - pure - blood origin for generations. When Draco finds out, he could start to question his family's values and actions. He might then try to find out who his non - pure - blood ancestors were and what their story was. Maybe he forms an unlikely alliance with some non - pure - blood characters in Hogwarts as he tries to come to terms with his new identity. There could also be a plot where the discovery of his non - pure - blood status changes his relationship with Harry Potter. Instead of being rivals, they could become allies as Draco realizes the unfairness of the blood - based discrimination in the wizarding world.
One possible plotline could be Draco trying to hide his squib status from his family. He might go to great lengths to fake being a wizard, like using magic - like tricks or relying on others to do magic for him in front of his family. Another plotline could be Draco befriending other squibs and forming a sort of underground community where they support each other and try to prove their worth in the wizarding world. Or, he could be discovered as a squib by his enemies, like Harry Potter and his friends, and instead of the usual animosity, they feel pity and try to help him come to terms with his new reality.