Another idea is that a magical item related to the Triwizard Tournament has the power to show people their deepest desires. When Harry and Mirajane come across it, they see a future where they are together and happy. This starts a journey for them to figure out if this future can be real. They face many challenges along the way, like dealing with jealous classmates and the dangerous tasks of the tournament, but they are determined to explore their relationship.
One plot idea could be that during the Triwizard Tournament, Harry and Mirajane are paired for one of the tasks. They have to work together to overcome some magical creatures. Harry's quick thinking and Mirajane's unique magic skills combine to make them a formidable team.
Maybe in the fanfiction, Mirajane is an exchange student at Hogwarts for the Triwizard Tournament. She and Harry meet and immediately sense a connection. As the tournament progresses, they discover that there are dark forces trying to use the tournament to their advantage, and they have to fight against it together. Harry's knowledge of the wizarding world in Hogwarts and Mirajane's experience from her own world make them crucial in stopping the threat.
One interesting plot idea could be a new task added to the Triwizard Tournament that involves solving a mystery in the Forbidden Forest. Another could be a friendship forming between Harry and a Triwizard competitor from a different school that changes the whole dynamic of the tournament. And perhaps a plot where magic from the different schools combines in an unexpected way during the tournament tasks.
In a Triwizard fanfiction, you could write about a situation where the Triwizard Tournament is held in a different location other than Hogwarts. Maybe it's held in an ancient wizarding ruin that holds many secrets and dark magic. The champions have to face not only the regular tasks but also the hidden dangers of the new location. Additionally, a plot where the relationships between the champions from different schools develop in unexpected ways, like a romantic relationship between a Beauxbatons champion and a Hogwarts student, could add a new dimension to the story.
One idea could be that the OC is a new member of the guild and Mirajane takes them under her wing. They could go on adventures together and the OC slowly discovers Mirajane's past and they form a deep bond. Another plot could be a love - hate relationship at first. The OC might misjudge Mirajane, but as they get to know each other better, they fall in love.
One idea could be a different champion from an unexpected school. For example, a small wizarding school in a far - off land sends a champion. This champion could have unique magic abilities that are not common in Hogwarts, Beauxbatons, or Durmstrang. They might use magic related to nature in a very different way, like communicating with magical plants to solve tournament tasks.
One idea could be that the Triwizard Cup is enchanted to transport the winner to a different dimension where they have to face challenges not related to the original tasks. Another could be that a dark wizard has tampered with the Cup to cause chaos during the final task. Maybe there's a plot where the Cup has the power to grant one truly selfless wish, and the champions must figure out what that means.
One idea could be a story where a new, unexpected champion enters the Triwizard Tournament. Maybe a student from a different magical school that we haven't heard of before. This new champion could bring unique magic and challenges to the tournament, causing all the other champions to have to adapt their strategies.
One idea could be that Natsu and Mirajane start a family in a peaceful post - guild - war era. Their kids inherit unique magical abilities from both of them and they have to train and guide their children through the magical world's challenges.
Perhaps in the fanfiction, Fleur could be in danger during one of the Triwizard Tournament tasks. Harry, being the heroic type, decides to risk everything to save her. This act of heroism not only changes their relationship but also how the other champions and the judges view Harry. It could also lead to some changes in the overall dynamic of the tournament, like new rules being implemented to prevent such dangerous situations in the future.
Perhaps the OC is from a different dimension where magic works in a strange way. Natsu, Mirajane, and Erza are intrigued by this. They team up to help the OC understand and control their magic in the world they are in now. Along the way, they encounter a powerful dark wizard who wants to use the OC's unique magic for evil. So, they have to fight together to protect the OC and the world from this threat.
Maybe Mirajane is kidnapped by a dark wizard who has a vendetta against her family. In the fanfiction, the wizard could be trying to force Mirajane to reveal the secrets of her family's magic. Her Fairy Tail comrades would have to figure out where she is and how to defeat this powerful foe.