It could bring back powerful wizards. For example, if a wizard like Merlin was resurrected using the power of the Infinity Stones, it would change the power balance in the wizarding world. He could have knowledge and magic far beyond what is currently known, and his return could either help in the fight against evil or cause new problems if his views are different from the modern wizards.
In a more complex way, the resurrection could be linked to the dark side. Maybe a dark wizard wants to resurrect an army of Death Eaters or other dark creatures. This would create a huge threat to the wizarding world. The heroes would then have to find a way to stop this resurrection plan while also dealing with the power of the Infinity Stones. The resurrection aspect could also lead to a new form of magic being discovered, as bringing the dead back to life might require a different kind of magic than what is currently known in the Harry Potter universe.
One way could be through a powerful dark wizard's experiment. Maybe a wizard, seeking ultimate power, discovers a way to bring the Infinity Stones into the magical world. They could be hidden as powerful magical artifacts, and their powers might be harnessed in a way similar to how wizards use magic. For example, the Time Stone could be used to manipulate time within the wizarding world, perhaps to reverse a tragic event or to gain an advantage in a battle.
He might become extremely powerful. The Infinity Stones have the power to manipulate reality, time, space and more. Harry could use it to defeat Voldemort in a much easier way. For example, with the Time Stone, he could go back in time to prevent certain events that led to Voldemort's rise or stop him from ever being born.
Yes, there are likely some fanfics out there with this concept. The 'Harry Potter' universe and the idea of the Infinity Stones from the Marvel universe are both very popular, so some creative fans might combine them in their fan - created stories.
Well, in a fanfiction scenario where Harry Potter finds an Infinity Stone, it would completely disrupt the balance of power in the wizarding world. Imagine if he got the Mind Stone. He could use it to read the minds of his enemies, uncover their plans way in advance. It would also likely attract a lot of unwanted attention from other powerful beings, both in the wizarding world and perhaps from the Marvel universe if there was some sort of crossover in the fanfic. He would have to be very careful not to let the power corrupt him, just like what could have happened to many characters in the original Harry Potter series who were tempted by dark magic.
Let's say Hermione found an Infinity Stone. She would immediately start researching it. She would scour the Hogwarts library and use all her knowledge of magic. She might try to find a way to control it or at least contain its power. She could also consider the ethical implications of such a powerful object. Would it be like a Horcrux? Should it be destroyed? These are the kinds of questions she would ask herself.
One way they could interact is through a magical accident. Maybe a wizard accidentally casts a spell near an Infinity Stone and it creates a rift between the two universes. Characters like Harry Potter could then be drawn into the Marvel universe. They might be initially confused by the high - tech and different power systems in the Marvel world. For example, the Infinity Stones' power to control reality, time, etc. would be a new concept to Harry who is used to magic like spells and potions.
Maybe in the fanfic, the Resurrection Stone was never truly lost. It was secretly being protected by a group of centaurs in the Forbidden Forest. A young Hogwarts student stumbles upon this secret while exploring the forest. The centaurs test the student to see if they are worthy of handling the stone. If they pass, they are given the stone to use for a short time, but they must return it unharmed. This could lead to a series of adventures as the student tries to decide who to bring back, if anyone.
The Resurrection Stone could be used to communicate with the dead rather than fully bring them back. The main character in the fanfic might be able to have conversations with lost loved ones, getting advice and wisdom from them. For example, Harry could use it to talk to his parents and Sirius, learning more about the fight against Voldemort.
If Harry Potter got the Space Stone, he could use it to instantly transport himself and his friends to different locations. This would be a great advantage in their fight against Voldemort, as they could quickly escape dangerous situations or reach important places without being detected. For example, they could suddenly appear in the Death Eaters' lair to gather intelligence.
You can start by looking on popular fanfic websites like Archive of Our Own (AO3) or FanFiction.net. Just use the search bar and type in relevant keywords like 'Harry Potter' and 'Infinity Stone' to see if any such fanfics pop up.