Another plot could involve the Carrow twins forming an unexpected alliance with some of the Hogwarts students. They might find themselves in a situation where they need the students' help, like when they are trapped in a magically booby - trapped area of the castle and have to rely on the knowledge of Hermione and others to get out. This could lead to a gradual shift in their relationships.
One idea could be that the Carrow twins have a change of heart. Maybe they start to see the wrong in Voldemort's ways after a series of events. For example, they witness an innocent being brutally punished by Death Eaters and it makes them question their loyalty.
To develop the Carrow Twins, you could start by exploring their backstory. Maybe they had a difficult childhood that led them to follow Voldemort. For instance, if they grew up in a family that was always loyal to the Dark Lord, they might have been indoctrinated from a young age.
One idea could be that Flora and Hestia Carrow are secretly working against Voldemort. They might be using their positions within the Death Eater - influenced Hogwarts to pass on information to the Order of the Phoenix. For example, they could be subtly changing the curriculum to teach students how to defend against the Dark Arts in a more practical way, all while pretending to be on Voldemort's side.
One interesting plotline could be the Carrow twins trying to manipulate Harry into joining their dark deeds, but Harry resists and tries to turn them to the good side. Another could be Harry forming an unexpected friendship with one of the twins that causes a rift between the twins themselves.
One possible plot could be the Carrow twins causing trouble at Hogwarts while Harry Potter tries to stop them, and a lemon element could be added in the form of a magical potion that has a sour but also strangely alluring effect on the characters. Maybe it makes them act out of character in humorous ways.
Perhaps in the fanfiction, Harry discovers that Hestia Carrow has a different side to her than what he initially thought. They could start off as enemies, but as they are thrown into various adventures together, they begin to understand each other. For example, they might have to work together to rescue a group of students held captive by a rogue wizard. This would force them to put aside their differences and rely on each other's strengths.
A prevalent theme is the idea of redemption. Some fanfictions explore if the Carrow Twins could ever turn away from the dark side. There's also the theme of fear, as they are often the source of fear for the Hogwarts students. They are used to show the oppressive regime during Voldemort's time. And of course, there's the theme of their relationship with each other, which can be complex and often drives the plot in many fanfictions.
One idea could be the twins inventing a new type of magical prank product that has unexpected effects on Hogwarts. For example, it might make the staircases act even more erratically than normal, causing chaos throughout the school.
One idea could be the Patil twins using their unique magical skills, perhaps learned from a different magical culture, to help Harry in a dangerous mission. For example, they might have a special way of divination that gives Harry an edge in predicting Voldemort's moves.
Well, they could be the result of some sort of cross - over experiment gone wrong (but in a good fanfic way). Maybe they have powers from both worlds but struggle to control them at first. For example, they might accidentally cast spells while trying to use their demigod powers. And they could be the bridge between the two groups of friends. The demigods are skeptical of wizards and vice versa, but the twins help them understand each other.
One idea could be that the twins have powers from both the wizarding world and the demigod world. They can use magic spells like in Harry Potter and also have the abilities of a demigod from Percy Jackson. For example, they can control water like Percy and at the same time cast defensive spells. Another plot could be that they are sent on a mission to stop a threat that endangers both the wizarding world and the Camp Half - Blood. They have to use their combined knowledge and skills to succeed.