In a fanfiction scenario, Harry Potter might be brought into the Avengers universe by some sort of magical portal malfunction. Once there, he'd see Thanos as a new kind of dark wizard. Harry would initially be confused by the new technology and different rules, but his courage would quickly make him a valuable part of the team. He could use the Patronus charm to ward off Thanos' minions, which are often filled with negative energy. The Avengers would be amazed by his magic and would learn to work with it to their advantage in the fight against Thanos.
Imagine Harry Potter in the Avengers' world facing Thanos. Harry's experience with Voldemort would give him some insights into dealing with powerful and evil foes. He could try to use the Elder Wand (if it somehow made its way into this fanfiction) to counter Thanos' power. The wizards in the Harry Potter world have different forms of magic that could be used in unique ways against Thanos. For example, transfiguration magic could be used to transform Thanos' weapons or his minions into something harmless. The Avengers would need to learn to trust in Harry's magic and work together with him to defeat Thanos.
He would bring a whole new dimension of power. His magic could be used for offense, like powerful curses, and defense, such as protective enchantments. The Avengers might be initially skeptical, but once they see what he can do, they'd welcome him. For instance, he could create a magical shield around the team using a spell like 'Protego Maxima' which could withstand Thanos' attacks better than their normal shields.
Harry would probably be a bit overwhelmed at first. He's used to the structured life at Hogwarts, but living with the Avengers would be very different. He'd have to get used to the high - tech environment and the non - magical ways of doing things. But he's a quick learner, so he'd start to adapt by learning from the Avengers. For example, he'd learn how to use their communication devices.
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.
He might start off being a bit of an outsider. The Avengers are used to high - tech gadgets and physical combat, while Harry is all about magic. But once they see how useful his magic can be, they'd start to work together well. He could use magic to enhance their weapons or create barriers to protect them.
The story could start with a magical accident that transports Harry Potter into the Avengers' universe. Since he's immortal, he has an edge. He could quickly learn about the Avengers and their mission. He might use his magic to save a member of the team, thus earning their trust. For instance, if Iron Man was in a life - threatening situation, Harry could use a levitation spell to get him to safety.
Well, in this fanfiction, Harry would probably use his magic to create a unique lightsaber. Maybe he'd combine his wand's magic with the technology of the lightsaber. For example, the blade could be made of enchanted light that can cut through dark magic as well as physical objects. He could use it against Voldemort's Death Eaters in a whole new kind of battle, with the swishing sounds of the lightsaber adding a new level of excitement to the wizarding duels.
Tony would likely laugh at some of the more out - there plot ideas. He'd probably think he could come up with better technology than what's in the fanfic. Steve would be more open - minded and might enjoy the creativity. Thor would be like 'This is not like any Midgardian story I've heard!'.
Some Avengers might be amused. For instance, Tony Stark would likely find it a fun distraction from his usual high - tech world and might even make sarcastic comments about the plot or characters. He could say something like 'These wizards should really upgrade their transportation - brooms? Seriously?'.
Harry would become more confident. The Avengers are some of the most powerful heroes in their universe. Training under them would give Harry a sense of belonging to an elite group. He would carry himself differently, with more assurance. In terms of his magic, he might learn to be more creative. For instance, learning from Doctor Strange (if he were part of the Avengers in this fanfiction) about different dimensions and magic could inspire Harry to explore new areas of magic that he hadn't considered before. His relationships with his Hogwarts friends might also change as he brings back new ideas and skills from his training with the Avengers.
Some of them would be entertained. Iron Man might laugh at the strange spells and potions. Hulk might not understand much but could enjoy the action parts if there are any. Thor could be curious about the magic and how it compares to his Asgardian powers.