If Spider Man had all the Infinity Stones, he would be extremely powerful. He could use the Time Stone to reverse bad events or prevent disasters. The Power Stone might enhance his physical strength to an unimaginable level, making him even more capable in combat against powerful foes. And with the Mind Stone, he could perhaps gain greater wisdom and understanding of his enemies' plans.
The Infinity Stones would likely put a strain on Spider Man's relationships. His friends and family might be worried about the power he holds. For example, Aunt May might be constantly afraid that he'll get hurt or that the power will change him for the worse. His relationship with MJ could also be affected. She might be in awe of his new power, but also a bit intimidated.
In this type of fanfic, the Infinity Stones could have a very different effect in the Harry Potter universe. For example, the Time Stone could be used to reverse dark spells or resurrect fallen wizards. However, the Stones' power might also be limited by the magic rules of the wizarding world. The fanfic could delve into how the characters from both universes adapt to the presence of the Stones and how they use or misuse their power.
A Jedi with all the Infinity Stones would be an extremely powerful force. They could use the Time Stone to foresee any threats to the galaxy and prevent them before they happen. With the Mind Stone, they could potentially influence the minds of Sith Lords to turn them away from the dark side.
Another idea is to base the fanfiction around the power struggle for the Infinity Stones. Your OC could be a new player in this battle, having unique abilities that make them both a target and a key figure. They might team up with some of the well - known Marvel characters like Iron Man or Captain America, but also have their own motives and secrets related to the Stones.
The Infinity Stones could be incorporated into the Naruto universe in a really interesting way. Picture this: Naruto is on a mission in a far - off land and stumbles upon a strange energy source. It turns out to be the Infinity Stones. As he tries to understand their power, he has to face off against a group of rogue ninjas who also want the stones for their own evil purposes. Naruto must then use his ninja skills and new - found knowledge of the stones to defeat them and keep the stones safe.