In terms of the other Slytherins, they would be shocked. Some might be angry that Draco is now related to Harry Potter, the 'enemy' in their eyes. But others might see it as a chance for Slytherin to gain more influence. And for the Gryffindors, they would be very protective of Harry but also very curious and maybe a bit wary about this new relationship with Draco.
The professors would also be affected. Dumbledore would likely see this as an opportunity to bridge the gap between Gryffindor and Slytherin. Snape, on the other hand, would be in a difficult position. He has always had a complex relationship with Draco and a begrudging respect for Harry. Now, with them being twins, he would have to deal with a whole new set of dynamics in the classroom and in the overall wizarding world.
Well, their relationship is complex. In the beginning, Draco may try to bully Harry as he used to in Hogwarts. But as Harry shows his true self and they spend more time together, Draco realizes that Harry is not the enemy he thought. They might start sharing secrets, and their relationship could evolve into a sort of brotherly bond, where they protect each other from outside forces and also from the expectations of their respective 'sides' in the wizarding world.
It changes it a great deal. They go from being bitter enemies to having a much more complex relationship. There's an immediate connection that they can't ignore.
In some fanfictions, it could develop due to a common enemy. Maybe there's a new dark force emerging in Hogwarts, and they both realize that they need to put aside their differences to face it. This shared goal makes them rely on each other more, and feelings start to grow as they see the other's courage and determination. Their relationship could grow from a begrudging alliance to a full - fledged romance as they discover new sides of each other.
Well, their relationship with Ron would be greatly affected. Ron might be a bit more suspicious of them at first, given their new identity as Riddle Twins. But as he realizes that they are still the same Harry and Hermione he has always known, he would gradually come around. With Dumbledore, he might treat them with a bit more caution while also seeing the potential in them to use their newfound connection to the Riddle family for good in the fight against the dark arts.
Another way is through a magical event that binds the two families. Maybe a spell gone wrong or a prophecy that only the combined power of the Potter and Malfoy families can fulfill. This forces them to interact and re - evaluate their relationship. It could start with suspicion and mistrust, but as they work towards the goal, they start to understand each other better and form a new, more positive relationship.
Fanfics change their relationship by creating situations where they have to rely on each other. For example, they might be trapped in a magical maze together and need to cooperate to get out. This forces them to see each other in a new light.
In this kind of fanfiction, their relationship would likely become more complex. Harry might initially be skeptical of Draco's new identity. But as he sees Draco facing discrimination for being a Muggleborn, he could start to feel sympathetic. They might end up becoming allies, working together against the pure - blood supremacists at Hogwarts. Instead of being rivals, they could be friends who support each other through the challenges of the wizarding world.
His relationship with Ron and Hermione would be strained at first. Ron has always disliked Malfoy, so he'd be confused and a bit angry at Harry's newfound admiration. Hermione might be more open - minded, but still skeptical. She'd try to reason with Harry. With the Weasley family, they'd also be a bit taken aback. However, Harry's new view of Malfoy could potentially lead to a more peaceful co - existence between Gryffindor and Slytherin students in general.
At first, they might be shocked and a bit confused about being twins. But as time goes on, they start to trust each other more. They could share their secrets and fears, like Harry might tell Draco about his nightmares of Voldemort, and Draco might open up about the pressure from his family.
Their relationship would likely become more complex. Draco, who was used to taunting Harry as a boy, might be more hesitant to do so when Harry is a girl. He could be thrown off by her new appearance and find it harder to be as cruel. There might be a sense of confusion in him.