Well, it would be quite a strange yet exciting scenario. Harry's magic skills would surely give the Allies an edge. He could use spells like 'Expelliarmus' to disarm enemy soldiers or 'Accio' to retrieve important items or intel. His invisibility cloak would also be a great asset for stealth missions.
In a fanfiction where Harry Potter fights in WW2, his magical powers could have a huge impact. Imagine him using the Imperius Curse to make enemy spies reveal their secrets. His knowledge of potions could also be useful, for example, creating antidotes for possible chemical weapons. He might even befriend some Muggles and introduce them to the wizarding world's existence, which could change the course of the war in terms of cooperation between the magical and non - magical communities.
If Harry Potter were to fight in WW2 in a fanfiction, he might face some challenges adapting his magic to the Muggle - dominated war. However, his bravery and loyalty would shine through. He could perhaps use his Patronus to boost the morale of the troops. Also, his ability to fly on a broomstick might be used for reconnaissance, although he'd have to be careful not to be seen by too many Muggles.
Well, in a fanfiction scenario where Percy Jackson fights in WW2, he'd bring his demigod powers to the battlefield. His ability to control water could be a huge asset. He could create tidal waves to disrupt enemy naval forces or use water to put out fires in bombed cities. His sword fighting skills would also be top - notch, making him a formidable opponent against regular soldiers.
Well, in such a fanfiction, Harry could have found a magical fire - producing object that gives him the ability to fight the dragon with fire. He might have to learn how to handle this new power quickly while in the heat of the battle. The dragon, on the other hand, would use its natural abilities like flying and breathing fire in return. It would be a battle of wits and power.
There are some 'Harry Potter WW2 Fanfiction' that focus on characters from the original series being transported back in time to WW2. Imagine Harry Potter himself ending up in the middle of the Blitz in London during WW2. He could use his magic to save Muggles from the bombings while also trying to find a way back to his own time. Or perhaps Hermione uses her vast knowledge to assist the resistance against the Nazis, with a magical twist of course.
One interesting 'Harry Potter WW1 fanfiction' could be where the magical world has to deal with the chaos of WW1 on the sidelines. For example, Hogwarts might be used as a secret base to heal wounded Muggle soldiers without their knowledge of magic. Another could involve Death Eaters trying to take advantage of the war in the Muggle world to further their own dark agendas in the wizarding world.
His friends from Hogwarts like Hermione and Ron would most likely support him. They have always been by his side through thick and thin in the original story, so in the fanfiction, they would continue to support Harry in his fight against the Ministry.
Hermione could help. She's very smart and could research about the dragon's weaknesses.
If Harry Potter fights Imhotep in fanfiction, Harry would likely start with his go - to spells. He might try a Stunning Spell or a Shield Charm. Imhotep, on the other hand, would probably use his powers of necromancy. Harry would be at a disadvantage in terms of not being used to dealing with an enemy who can raise the dead. However, Harry has the advantage of speed and agility in combat, which he has learned from his years at Hogwarts. So it would be a very interesting fight to read about.
In a fanfiction where Harry Potter fights Sauron, Harry would be at a disadvantage in terms of raw power. Sauron is an ancient and extremely powerful being. However, Harry has his courage and quick thinking. He could use his ability to solve mysteries and puzzles. He might figure out a way to destroy the One Ring, which would be a huge blow to Sauron. But it wouldn't be easy as Sauron would be constantly trying to stop him.
Well, if Harry Potter were to fight the Hulk in fanfiction, Harry would likely be at a disadvantage initially. The Hulk's brute strength is on a whole different level. But Harry is smart and resourceful. He might use his invisibility cloak to get close and then hit the Hulk with a powerful blasting curse. The Hulk, though, would probably just get angrier and more powerful. It would be a really interesting battle to read about, with magic vs raw physical power.
In a Harry Potter vs Odin fanfiction, it could start with Odin thinking Harry is a threat to the Asgardian way. Harry, on the other hand, is just trying to protect Hogwarts. The fight might involve Odin using his powerful spear Gungnir while Harry combines his Patronus charm with some of the more powerful dark arts spells he's learned in his fight against Voldemort. But Harry would be reluctant to fully embrace the dark arts as it goes against his nature.