Well, one possibility is that Harry would use his magic in very unexpected ways during the war. Maybe he'd use spells to confuse the enemy troops or to create illusions to mislead them. His magical skills could give his side an edge in battles.
Well, it could be that Harry Potter discovers an evil empire within the wizarding world that has been secretly controlling things. He then uses his magic skills and the help of his friends to fight against it. Maybe there are new dark spells and powerful artifacts involved in this fight.
Magic, of course. Harry would use spells like Stupefy or Expelliarmus. The dragon's characteristics are also key, like its size, color, and the type of fire it breathes. And the setting, whether it's in a dark forest or a hidden cave.
Harry would probably start by trying to understand Thanos' powers. He might use his invisibility cloak to get closer and assess the situation. Then he'd likely use some of his most powerful spells like Avada Kedavra, but it might not be as effective against Thanos as it is against normal foes.
Well, the world of fanfiction is vast. There are fanfics where Harry Potter's magical abilities are pitted against Thanos' brute strength and advanced technology. Some might show Harry having to adapt quickly to the different kind of threat Thanos poses compared to the dark wizards he's used to fighting. The best ones often have a well - thought - out plot that not only focuses on the fight but also on how the two universes' rules interact.
In a 'Percy Fights Harry Potter' fanfic, perhaps they could fight over differences in their approaches to dealing with Voldemort. Percy, with his by - the - book attitude, might clash with Harry's more instinctive and unorthodox methods.
It could be a group of rogue Death Eaters who have formed their own empire after Voldemort's fall. They might be more radical and have new, even darker plans for the wizarding world.
One possible reason could be a misunderstanding. Maybe Harry is led to believe that Dumbledore has been hiding something crucial about his parents' death or Voldemort's return. For example, if Harry discovers some encrypted files in Dumbledore's office that seem to suggest Dumbledore had a prior deal with Voldemort, it could lead to a fight. Another aspect could be related to power. If Harry feels that Dumbledore is being too controlling over his actions and the use of his powers, he might lash out. In the wizarding world, power struggles are not uncommon, and Harry, as a powerful wizard in his own right, might want to assert his independence.
I think 'Arthur Fights a War Fanfic' could be really exciting. It might show Arthur's courage and strategic skills in the face of war. Maybe he has to lead his troops against a powerful enemy, and there could be a lot of intense battle scenes.
In 'rose fights in the time war fanfic', perhaps Rose is a hero. The time war setting allows for all kinds of exciting plot twists. For example, she might have to deal with different versions of herself from various timelines. The fanfic could also delve into the moral implications of her actions during the war, like whether she should sacrifice one timeline to save another. It's really a fertile ground for creative storytelling.