In a fanfiction where they meet, the story could be centered around Harry trying to protect his world from Thanos. He would bring all his knowledge of magic and his friends from Hogwarts. Harry could use the magic of the Elder Wand, which is one of the most powerful wands in the Harry Potter universe. Thanos would be a formidable opponent, but Harry's magic could potentially find a weakness in Thanos' defenses. For example, magic in the Harry Potter world can affect the mind, so Harry could try to use a spell to make Thanos see the error of his ways or at least incapacitate him long enough to get the Infinity Stones away from him.
There would be a clash of two very different power systems. Harry's magic might initially confuse Thanos. Thanos, on the other hand, with his brute strength and the Infinity Stones, would be a huge threat to Harry. Maybe Harry would try to find a magical way to neutralize the power of the Infinity Stones. For example, he could use a spell that disrupts magical or non - magical energy sources. It would be a battle of wits as well as power.
If they met in a fanfiction, it could go in many directions. Harry could attempt to form an alliance with Thanos, trying to convince him that there are other ways to achieve his goals than destruction. Or they could immediately start fighting. In the fight, Harry might use his invisibility cloak to get close to Thanos and then use a stunning spell. Thanos would likely use the power of the Infinity Stones to counter Harry's attacks.
If we consider Harry Potter fighting Thanos in fanfiction, it's a clash of two very different universes. Harry has his wand and his knowledge of spells. He could try to transfigure Thanos into something harmless, but Thanos' willpower might resist such magic. The Time - Turner could also be a factor if Harry could use it to his advantage, perhaps going back in time to prevent Thanos from getting the Infinity Stones. But Thanos' brute force and his army could pose a great threat to Harry. It would be a battle that would depend on Harry's quick thinking and ability to adapt his magic to this new and powerful enemy.
Well, in a Harry Potter x Thanos fanfiction, Harry could potentially use the Time - Turner (if it still exists in this scenario) to outwit Thanos. He might go back in time to prevent Thanos from getting the Infinity Stones. But Thanos is no fool. He'd be aware of such time - tampering and would likely have counter - measures. Maybe he'd use the Reality Stone to create illusions and deceive Harry. It would be a battle of wits and power where both characters would have to push their abilities to the limit.
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.
In fanfiction, if Percy Jackson met Harry Potter, they might first be a bit wary of each other. Percy, with his water - based powers and Greek mythology background, and Harry, with his magic from the wizarding world. But soon they could realize they have a lot in common. Both are heroes in their own right, facing great challenges and having a strong sense of justice. They could team up to fight a new threat that combines the dark forces from both their worlds, like a wizard who has harnessed the power of Greek monsters.
Well, it could be really chaotic. The characters might be shocked to see the actors who play them. For example, Harry Potter himself might be really confused seeing Daniel Radcliffe. He'd probably wonder why this person looks like him but is clearly not from his wizarding world. Maybe Hermione would start asking the Emma Watson version of herself all sorts of questions about the Muggle world.
A Harry Potter who reverses Thanos would be a very interesting concept. Harry could use his ability to communicate with snakes (Parseltongue) to perhaps take control of some of Thanos' minions. His magical items like the Invisibility Cloak would give him an advantage in stealth. He might even use the Time - Turner to go back in time and prevent Thanos from getting the Infinity Stones in the first place. The Hogwarts environment could also be a factor, with its many secrets and magical defenses that could be used against Thanos.
Maybe Harry Potter could stop Thanos with the help of his friends. Hermione's intelligence could come up with a plan. They could use time - turners to go back in time and prevent Thanos from getting the Infinity Stones in the first place. Ron could be there for moral support and also use his chess - playing skills to outwit Thanos in some strategic battles.
Well, it could be really exciting. Maybe Percy would show Harry some cool water - based magic tricks using his powers over water. And Harry could introduce Percy to the world of wands and spells. They might team up to fight some common enemy, like a dark wizard who also has a connection to the Greek gods.
Well, if Harry Potter characters met the actors in a fanfic, chaos might ensue at first. The characters are used to their own world, and suddenly seeing people who look exactly like them but are from a different realm would be quite a shock. However, they could also bond over their shared 'existence'. For example, Draco Malfoy might initially be hostile to Tom Felton, but then they could find common ground in their 'roles' as the 'bad boy' in different ways.
The plot could start with Thanos arriving in the wizarding world. Harry senses the great danger he poses. Harry would first try to understand Thanos' powers and motives. He might gather information from the Ministry of Magic's records or from ancient magical texts. Then, he would start to form a team of wizards and witches who are willing to fight. As the story progresses, they would engage in battles with Thanos and his minions. Harry would use his Patronus charm to protect his team from Thanos' dark energy, and he would gradually figure out a way to stop Thanos, perhaps by using a combination of powerful spells and the unique magical environment of the wizarding world.