There could also be some new characters introduced in the fanfiction. For instance, a dragon tamer who has some connection to the dark dragon. This person might be either trying to control the dragon for their own dark purposes or trying to stop it from causing more harm. Another character could be an old wizard who has some knowledge about the origin of the dark dragon and helps Harry and his friends.
Obviously, Harry Potter himself is often involved. He's the hero of the original series, so in fanfiction about a dark dragon, he'd be the one to step up and face the new threat. Hermione and Ron would likely be by his side too, as they are his closest friends.
In addition to the main trio, characters like Draco Malfoy could be a major part of the story in 'Harry Potter Dark Paladin' fanfiction. Draco's complex relationship with the dark side in the original series could be further explored in relation to the Dark Paladin. There could also be original characters created specifically for the fanfiction, who might be fellow Dark Paladins or those who have a connection to the dark powers that the main Dark Paladin is using.
Harry Potter himself is often a main character. Since he has a connection to Voldemort, he's likely to be involved in any dark discoveries related to the Dark Lord.
Hermione Granger might also be a central character. Her thirst for knowledge could lead her into situations where she is in the dark, like exploring a new area of magic that has many unknowns. As a child in Hogwarts, she might be trying to solve a mystery that no one else has been able to, and she has to start from a place of not knowing much, or being 'in the dark' so to speak.
Harry Potter himself is often a central character. Since he's the main character in the original series, it makes sense that in 'Harry Potter Dark Gifts Fanfic' he would be involved. Writers might explore how he copes with or uses a dark gift.
One interesting aspect could be the origin of such a dark dragon. It could be a result of dark magic experiments gone wrong. For example, a wizard trying to enhance a dragon's natural abilities with dark magic, but instead creating a more menacing and uncontrollable creature. This would then lead to a whole new set of challenges for Harry and his friends to face.
Another character could be Draco Malfoy. There could be fanfiction where Draco, having been on the wrong side for a long time, now has a change of heart and wants vengeance against his own family or the Death Eaters who used him. He might use his knowledge of the Dark Arts that he learned from his family, but now turn it against them in a bid for redemption through vengeance.
Harry Potter himself could be one of the main characters in such fanfiction. Maybe he gets an automail limb after a particularly dangerous encounter with Voldemort. Hermione might also be involved, using her vast knowledge to help understand and improve the automail technology within the wizarding context.
Harry Potter himself is often a central character. Since he was the one destined to defeat Voldemort and destroy the Horcruxes in the original story, many fanfictions continue his journey with Horcruxes in new and different ways. Hermione Granger also features prominently. Her intelligence would be crucial in understanding the nature of Horcruxes and finding ways to deal with them.
Well, Harry Potter himself is often involved. Since he is the main character in the original series, in fanfiction with a genie, he could be the one to find the genie and interact with it. For instance, he might be the one to use the genie's wishes to save his friends or defeat his enemies.
Ron Weasley can also play an important role. He might be the one who accidentally causes an accident that sends someone to the hospital, and then feels really guilty about it. So he spends a lot of time in the hospital wing trying to make it up to the injured person, while also getting into some comical situations with the other patients and the Healers.