Another possibility is that Draco falls in love with a character from the opposing side. His love could be so strong that it overrides his loyalty to his original side, leading him to change. For example, if he falls for a Gryffindor, he might start to see things from their perspective and gradually shift his allegiance.
Perhaps Draco has a near - death experience that makes him re - evaluate his life. He realizes that the path he was on was only leading to destruction. After this awakening, he decides to use his skills and knowledge to help the other side instead. He could secretly start passing information or actively fight against his former allies.
Another plot could involve Harry being influenced by a family connection he discovers to a Death Eater. This newfound relation makes him reevaluate his beliefs and he starts to see the Death Eaters as more than just pure evil. He might think that by joining them, he can reform them from the inside.
One interesting idea could be exploring the complex relationships Harry has to re - evaluate. For example, his friendships might be strained as he changes sides. Another aspect could be how his view of the magical world's power structures alters. He might start to see the other side's motives in a different light, which could lead to some unexpected alliances.
His relationship with his family would be severely strained. His parents, who were loyal to the Dark side, would be shocked and disappointed. They might even try to persuade him to come back, which could lead to a lot of family drama.
One interesting plot twist could be Tony going back in time and preventing the creation of Ultron. This would completely change the dynamic of the Avengers. Without Ultron, there would be no Sokovia Accords fallout at least not in the same way. Another could be Tony changing the events that led to the death of a certain Avenger. Maybe he stops Loki from killing Agent Coulson, which could have a ripple effect on how the team forms and functions.
One interesting plot twist could be that Ginny and Draco's pregnancy is a result of a magical accident. Maybe a spell gone wrong during a battle or an experiment that binds their magical essences together. Another could be that they keep the pregnancy a secret from everyone at first, and as they struggle to come to terms with it, they start to develop unexpected feelings for each other. For example, Draco, who has always been a bit of a snob, realizes Ginny's true strength and kindness through this situation. And Ginny sees a more vulnerable side of Draco that she didn't expect.
Well, a great plot twist could be that Draco, now a girl, has her memories of being a boy slowly fading away. This causes her to struggle with her identity in a whole new way. She starts to develop relationships based on her new self, and it turns out she has a natural talent for a subject like Divination, which she had previously scoffed at. This newfound interest and talent could lead her on a different path in Hogwarts, away from the typical Slytherin pursuits.
One interesting plot twist could be that Draco saves Hermione not out of pure altruism but because he discovers a dark plot against the wizarding world that Hermione unknowingly holds the key to solving. So, by saving her, he's also saving himself and his family from a greater threat.
In a 'Draco switches sides' fanfiction, it might start with Draco being disillusioned with his family's long - standing loyalty to Voldemort. His experiences at Hogwarts, especially his interactions with some of the more morally upright students like Hermione or Harry, could gradually nudge him towards the other side. He might first resist the idea but then, after a major event, such as seeing an innocent person being brutally attacked by Death Eaters, he decides to switch sides and use his position within the Death Eaters to undermine them from within.
In some of these fanfictions, a great plot twist is that Draco, being a Muggleborn, is actually a long - lost heir to a powerful Muggle - related magical artifact or prophecy. This throws the whole wizarding world into chaos as different factions try to either use him or protect him. Also, there could be a plot twist where Draco uses his knowledge of the Muggle world to outwit dark wizards. Since he has a connection to the Muggle world that most pure - bloods don't, he can come up with strategies that are completely unexpected, like using Muggle technology in a magical way to defeat his enemies.
One interesting plot twist could be Draco secretly helping Harry Potter in the Triwizard Tournament tasks. Maybe he realizes that there's a greater danger at play that could affect both the wizarding world and his own family, so he decides to put aside their rivalry for a while.