Draco Malfoy is also quite popular. Fanfiction writers might explore his complex relationship with both Harry and Voldemort. He could be in a situation where he has to choose between his loyalty to his family (who has ties to Voldemort) and doing the right thing by helping Harry.
Hermione is often a very popular character. She's known for her intelligence and resourcefulness, and in fanfiction, she might come up with new spells or strategies to help Harry in his fight against Voldemort.
Hermione is often a very popular character. In fanfiction, she might use her vast knowledge of magic and books to come up with unique strategies to help Harry in his fight. For example, she could find a long - forgotten spell in an ancient tome that could turn the tide. Ron is also popular. His loyalty and courage could be emphasized more in fanfiction, like he makes a heroic sacrifice to save Harry at a crucial moment.
Harry Potter often features prominently. His relationship with Snape is complex in the original series, and in fanfiction involving Snape and Voldemort, his role can be further explored. For example, how he reacts to Snape's interactions with Voldemort and whether he can figure out Snape's true motives sooner.
Dumbledore. His vast knowledge of magic and the wizarding world could play a crucial role. He might have some prior knowledge about the origin of the creature situation involving Harry and Voldemort. He could also offer guidance and wisdom, perhaps even try to find a way to use the situation to finally defeat Voldemort in a more permanent way.
Their children are often very popular characters. James, Albus, and Lily Potter can have their own unique personalities and story arcs. For instance, James might be the mischievous one like his father was at his age, getting into all sorts of trouble at Hogwarts. Albus could be the more introverted and studious one, grappling with the weight of his father's legacy. And Lily might be the brave and headstrong girl.
Hermione is often a popular character in these fanfictions. She might play a role in helping Harry and Draco get along or in uncovering the mysteries of the Goblet of Fire. Another could be Cedric Diggory. His death in the original story is a big event, and in fanfiction, he could be brought back in some way related to the Goblet of Fire's magic, and interact with Harry and Draco.
Draco Malfoy is often a very popular character in these fanfictions. Since Narcissa is his mother, his relationship with her and how it is affected by her interactions with Harry can be a major plot point.
Hermione could be quite popular. In the fanfictions, she might be the one who tries to figure out the science or magic behind Elsa's powers. Another could be Ron, who might be initially skeptical of Elsa but then grows to be her friend. Olaf from Elsa's world could also be popular as he brings his unique brand of humor to the mix when he enters the wizarding world.
Marvolo Gaunt is also quite popular. As Merope's father, he represents the old, dark ways of the Gaunt family. Fanfiction might explore his relationship with Merope in more depth, like how he treated her, and whether he had any hopes or plans for her future that were different from what actually happened.
James Potter often makes an appearance. Since he was Lily's husband, his relationship with both Harry and Lily is explored in different ways. For example, in some fanfictions, Harry gets to see a side of his father through Lily's memories that he didn't know before.