It's hard to say without reading the fanfiction. They could be the Triwizard champions like Cedric Diggory, Fleur Delacour, and Viktor Krum. Or it could be some new champions created specifically for this fan - made story.
Well, in Harry Potter fanfic, the Triwizard Champions could be a whole mix of different characters. Sometimes, authors might create alternate versions of the original champions. For example, they could make a character who was overlooked in the original story become a champion. It could also include characters from different magical schools that are not part of the canon Triwizard Tournament, like a school from a far - off land. Or perhaps a character who has some special power or ability that makes them stand out as a champion in the fan - created story.
I'm not entirely sure as there could be many different interpretations. It might be about how Harry Potter is safeguarded by the champions in some sort of alternate scenario within the fan - created story.
These fanfictions are popular because they tap into the sense of heroism and loyalty. The idea of the champions, who are from different places and have different personalities, coming together to protect Harry is really appealing. It gives readers a chance to see more of the magical world and how different characters interact in a situation that is not part of the main storyline. Also, it can explore different magical abilities and how they can be used in combat or protection, which is always exciting for fans of the Harry Potter universe.
One great 'Champions Protect Harry Potter' fanfiction might be 'The Champions' Vow'. In this story, the champions from different houses come together in a very creative way to shield Harry from various threats at Hogwarts. It has some really interesting character interactions.
Obviously, the previous Triwizard champions like Cedric Diggory (even though he passed away, there could be some magical way he's brought back), Fleur Delacour, and Viktor Krum would be the main characters. Harry Potter himself would also be involved as he was an unexpected champion in his time.
It could also center around a mystery related to their previous participation in the Triwizard Tournament. Something that was left unfinished or a secret that's now starting to surface. Their return might be triggered by signs or prophecies related to this mystery. They would then have to work together, along with Harry Potter and his friends, to solve it and prevent any potential disasters in the wizarding world.
Another plotline could be a champion who discovers a dark secret about the tournament's origin. They might find out that it was originally created as a means to control or manipulate young wizards, and they have to decide whether to expose it or play along to protect themselves and their friends.
Cedric Diggory is often quite popular. Since he was a champion in the original series, fanfiction writers like to explore more of his story, his thoughts during the tournament, and even what could have happened if he had survived. He has that heroic and noble quality that makes him a great focus.
Fleur Delacour is quite popular too. Her beauty and her status as a Beauxbatons champion make her a fascinating character to write about. Many fanfictions explore her relationship with the other champions, especially Harry. Additionally, Hermione Granger often plays an important role in these fanfictions. Her intelligence and her friendship with Harry mean she can be involved in many different storylines related to the Triwizard Tournament, like helping the champions prepare for their tasks.