Perhaps they were separated at birth due to some dark wizard's plot. As they grow up, they start to notice strange similarities in their magical abilities and instincts. When they find out they are triplets, they join forces to uncover the mystery behind their separation. They might face many obstacles, like opposition from their respective families who have different beliefs and values. Harry's Gryffindor - like courage, Draco's Slytherin cunning, and Blaise's own unique traits would all play a part in this adventure.
A possible plot could be that they are triplets but were magically altered at birth so that their personalities are different. As they get closer in Hogwarts, they start to influence each other in unexpected ways. Draco becomes less prejudiced, Harry becomes more understanding of the Slytherin way, and Blaise becomes more of a mediator between the two. This transformation not only affects their relationship but also has an impact on the overall Hogwarts environment, as it starts to break down the long - standing barriers between Gryffindor and Slytherin.
Another idea is that the OC is a Muggle - born with an amazing talent for potions. They end up in a class project with Harry, Draco, and Blaise. Their different approaches to the project (Harry's courage, Draco's ambition, Blaise's shrewdness) and the OC's out - of - the - box thinking create a really interesting dynamic as they compete and also learn from each other.
One plot idea could be a story where Blaise and Draco have to team up with Harry and Hermione for a special magical tournament. They start off as reluctant allies but gradually learn to respect each other's skills. Another could be a mystery - something strange is happening at Hogwarts and the four of them must put aside their differences to solve it. For example, students are losing their magical abilities one by one, and they suspect a dark magic artifact hidden in the castle.
A plot could be set post - Hogwarts. Draco and Blaise are trying to redeem their families' reputations in the wizarding world. Hermione, being the brilliant witch she is, is working on some important magical research. Their paths cross when a dark magic artifact resurfaces. Hermione believes it can be used for good if studied properly, while Draco and Blaise are worried it will fall into the wrong hands again. So they team up to protect it and study it.
One plot idea could be that they are forced to work together on a school project that requires them to explore each other's family histories. This makes them realize they have more in common than they thought. Another could be that they discover a secret magical realm only they can access together, and in the process, they form a bond. Or perhaps they are both framed for a crime and have to rely on each other to clear their names.
Well, in this type of fanfiction, a possible plot is that Harry is sold due to a powerful curse placed on his family. Draco, who has a change of heart over time, tries to break the curse. This could lead to a journey of self - discovery for both of them. They might also discover secrets about their families' pasts that are intertwined. Also, the situation could force them to work together against a common enemy that emerges because of Harry's new 'ownership' status.
One plot idea could be that they discover their family connection early on. Maybe they find a hidden family tree or an old letter that reveals the truth. This could lead to them having to work together secretly to protect their newfound family bond from the wizarding world's prejudices.
One idea could be a story where they are all assigned to a special project at Hogwarts. Blaise, Draco, Hermione, and Theo have to put aside their differences and work together. Maybe it's a research project on a long - forgotten magic that could potentially be dangerous if misused. As they dig deeper, they start to understand each other better. Hermione's knowledge, combined with the Slytherins' cunning, makes for an interesting dynamic.
A great plotline might involve a magical competition where Draco, Blaise, and Harry are all forced to compete. As they face various challenges, they start to understand each other better. For example, they realize that they all have the same fears about the future of the wizarding world. It could also be a plotline where they are all transported to an alternate dimension and have to rely on each other to get back home.
One interesting plot idea could be that they discover they are brothers early on. They then have to deal with the shock of it within the context of the Hogwarts houses. Harry might try to bring Draco closer to his friends, which could lead to some really funny and awkward moments as Draco is used to his Slytherin clique. Another idea is that they work together to uncover secrets about their family, secrets that could change the wizarding world's view of their family's past.
A frequent plotline involves their family drama. With Hermione being a Muggle - born and Draco and Blaise from pure - blood families, there would be a lot of family issues to deal with. For example, how would the Malfoy family react to having a Muggle - born as part of their family? Also, they might be forced to work together to protect their family from threats. Maybe an old enemy of the Malfoy family targets them because of their new family situation. There could also be a plotline where they explore their magical abilities together and discover new and unique forms of magic due to their special connection as triplets.