Actually, Harry could be the most interesting character to develop in this fanfiction. His relationship with Draco is already full of tension. When he discovers Lucius using the Imperius Curse on Draco, he has to decide whether to help Draco or use the situation to his advantage against the Death Eaters. His moral compass and his natural inclination to do the right thing would be put to the test.
One idea could be that Draco is put under the Imperius Curse by Lucius to perform a dangerous task at Hogwarts, but Harry somehow senses something is wrong and tries to save Draco. Another could be a backstory where Lucius used the Imperius Curse on others during his time at Hogwarts, and Draco discovers this and has to deal with the moral implications. Maybe also a plot where Harry uses the knowledge of the Imperius Curse on Lucius to gain information about Voldemort's plans, and Draco gets caught in the middle of this power struggle.
A Death Eater could be the main character. For example, a Death Eater who is starting to have doubts about Voldemort's use of the Imperius Curse. He could be put under the curse himself by Voldemort to do something he doesn't want to, and the fanfic could be about his internal struggle to break free and change sides.
Well, one plot twist could be when Lucius, instead of using the Imperius curse on Harry as expected, uses it on Draco to make him spy on Harry. And it turns out Draco is actually a double agent working with Harry in secret.
One great fanfiction could be 'The Malfoy Redemption'. In it, Draco is under the Imperius curse cast by his father Lucius, but Harry Potter steps in to break the curse. It shows a complex relationship between the characters.
Perhaps Voldemort himself. He might see Draco as a tool, and Imperiusing him would allow Voldemort to have more control over the Slytherin side of Hogwarts or use Draco to spy on Harry. Another possibility is a rogue wizard who has a grudge against the Malfoy family and wants to cause them trouble by making Draco do things he wouldn't normally do while under the Imperius Curse.
One interesting 'Harry Potter Imperius Curse' fanfiction could be one where the main character has to fight against the Imperius Curse in a creative way, like using a new spell combination. Another might be a story that explores what would happen if the Imperius Curse was used on a major Hogwarts professor and how it would disrupt the school's normal functioning.
One way the Imperius Curse is used in fanfic is to show the power dynamics among different characters. A powerful wizard might use it on a group of less powerful ones to gain control. Fanfic authors might also explore the long - term effects of being under the curse. Does it leave a mental scar? These are all interesting aspects that can be explored in Harry Potter Imperius Curse fanfic.
It's often portrayed as a very dangerous and powerful tool. Characters may be terrified of it. For instance, a young wizard might grow up hearing stories about the Imperius Curse and be extra cautious around those who might use it.
The Imperius Curse can also be used in fanfiction to bring in new elements to the story. For instance, a fanfic could have a character use the Imperius Curse to gain an advantage in a wizarding competition, which then leads to a series of events where other characters have to uncover the truth and deal with the consequences. It adds an extra layer of intrigue and conflict to the fan - created story.
There's also the possibility that it's a character who has been secretly working against Harry all along and finally resorts to the Imperius Curse to fully control him. This character could be someone who is jealous of Harry's fame or power.