Their relationship could start with hostility. Draco has been an enemy to Harry for a long time. But during the Horcrux hunt, they might find common ground. For instance, they both want to stop Voldemort, even if their reasons are different. This common goal could lead to a grudging respect. Harry might see that Draco isn't all bad, and Draco might see Harry as more than just the 'Chosen One' he resented.
It could develop into a sort of friendship. As they face the perils of the Horcrux hunt together, sharing close calls and difficult moments. They might start to trust each other. Draco could open up about his fears of Voldemort and his family's situation, and Harry could share his own insecurities about being the one to defeat Voldemort. This sharing could bring them closer and change their relationship from enmity to something more positive.
Another plot could involve Draco actually knowing some secrets about the Horcruxes that he initially doesn't want to share with Harry. But as the danger of Voldemort's power growing becomes more and more real, he realizes he has to help. So, during the hunt, Draco gradually reveals bits of information that he has, which helps Harry in unexpected ways. This could lead to a redemption arc for Draco, as he goes from being on the side of the Death Eaters in a way to actively working against Voldemort by assisting Harry.
In some fanfictions, Draco might use his knowledge of the Dark Arts and Hogwarts' secrets. Since he was raised in a Death Eater family, he could have insights into how Voldemort might have hidden the Horcruxes. For example, he might know of certain places within the school that Voldemort frequented or had an interest in.
Harry is very determined and has a strong sense of right and wrong. Fleur is proud and confident, often relying on her Veela heritage. Tonks is more laid - back but also very loyal. Their personalities could clash as Fleur's pride might make her not want to take orders from Harry. However, they could also complement each other. Harry's determination could keep them focused on the goal. Fleur's confidence could boost their morale, and Tonks' loyalty would ensure she stays with the group through thick and thin.
In some fanfictions, Draco might use his knowledge of the Dark Arts. He could have insights into the protections around the cave that Voldemort might have set up, given his family's closeness to the Dark Lord. For example, he might know about certain spells or enchantments that are typical of Dark magic and be able to help the characters navigate through them.
At first, Harry and Draco would be at odds in prison. Harry, with his sense of justice, would be disgusted by Draco's past actions. Draco, on the other hand, would be resentful of Harry's 'holier - than - thou' attitude. But as they are forced to live in close quarters and face common threats, they might begin to communicate. They could share their fears and hopes. Slowly, this could lead to a grudging respect for each other. Maybe Draco would open up about his family's pressures, and Harry would understand his situation better. This could transform their relationship from enmity to a more amicable one.
Hermione might be one of his allies. Despite their past differences, they could put aside their grudges for the greater good of the Horcrux hunt. Also, Neville could potentially be an ally. Neville has shown great courage and determination, and he might see Draco's newfound willingness to fight against Voldemort as a sign of change.
At first, it might be rocky. Draco, used to his pure - blood superiority, would be a bit resentful of having to share his home and life with Harry. But as time passes, they'd start to see each other's good qualities. Harry's bravery would impress Draco, and Draco's cunning could earn Harry's respect. Eventually, they'd become close friends, always having each other's backs.
Their relationship might start with distrust. Harry, like Arthur, may be wary of Draco, as Merlin, due to their past differences. But as they face common enemies, they begin to rely on each other. Draco's magic skills, similar to Merlin's, prove useful to Harry, and they gradually form a bond of friendship and mutual respect.
In the beginning, it would be a relationship of power imbalance with Draco in the dominant position. But as they spend time together, they would begin to understand each other better. Harry might share his experiences of loss and struggle, which could make Draco more sympathetic. Draco could also show Harry a different side of the wizarding world, the pure - blood side from a more personal perspective. This exchange of views and experiences could gradually break down the barriers between them, leading to a relationship that is based on mutual understanding and, potentially, love.
At first, their relationship might be full of confusion. They've been brought up with different values - Harry with his Gryffindor courage and sense of justice, and Draco with Slytherin pride and ambition. But as they discover they're twins, they'd start to see the similarities in themselves. They might begin by being a bit hostile towards each other, but gradually, as they face challenges together, like dealing with a particularly tough teacher or a dangerous creature on the grounds, they'd form a bond.