One possible plot twist could be that Peter uses his intelligence rather than just his powers to defeat Thanos. Maybe he discovers a weakness in Thanos' armor or a flaw in his plan that no one else has noticed. For example, he could find out that Thanos' Infinity Gauntlet has a time - limited recharge period for its powerful snaps, and he uses this knowledge to his advantage at a crucial moment.
Perhaps in the fanfiction, Peter kills Thanos in an unexpected way. Instead of a big, epic battle, it could be a stealthy assassination. He could use his spider - sense to get close to Thanos undetected and then use a specially designed weapon that can counteract the power of the Infinity Stones. This would be a very different take on the typical showdown between a hero and a villain.
In this fanfiction, the death of Thanos at Peter's hands might have far - reaching consequences. It could lead to a power vacuum in the universe, with different factions vying for control. Peter may then have to deal with the aftermath, including facing enemies who were once afraid of Thanos but now see Peter as a threat. His actions could also change the perception of Earth and its heroes in the eyes of the galactic community.
One possible plot could be that Peter Parker discovers a new power within himself that gives him the edge to take on Thanos. Maybe it's a power related to the Time Stone that he manages to manipulate in a way that Thanos can't counter. He could use this power to outwit Thanos in a battle and finally deliver the killing blow.
Peter could use his agility. Since he's super - agile, he can dodge Thanos' attacks easily. Then, when Thanos is off - guard, Peter can strike. For instance, he can web up Thanos' hands so he can't use the Infinity Gauntlet properly.
In a 'Tony kills Thanos' fanfiction, the plot could start with Tony being haunted by his previous failures against Thanos. He decides to go on a solo mission to study Thanos more closely. He discovers a way to disrupt Thanos' connection to the Infinity Stones. With this knowledge, he devises a plan. He lures Thanos into a trap where he has set up a device that can nullify the power of the Stones. Then, in a tense battle, Tony uses his own advanced technology and combat skills to fight Thanos without the Stones' advantage and finally manages to kill him. This could be a story of redemption for Tony, showing his determination and ingenuity in the face of seemingly insurmountable odds.
One consequence could be that Peter Quill Parker becomes a hero. People all over the universe might look up to him. But he may also face some jealousy or envy from other powerful beings.
In the fanfiction, Peter Quill Parker might have some new powers or gadgets that give him the edge. He could have studied Thanos' fighting patterns and found a way to counter them. Also, his quick thinking and ability to improvise in tough situations would play a big role. He might even use his charm to get close to Thanos and then strike when he least expects it.
In this fanfiction plot, perhaps Thanos' actions in the Marvel universe start to affect Naruto's world. Naruto then sets out to find the source of the disturbance. When he encounters Thanos, he is initially outmatched. But as the story progresses, Naruto befriends some of the Marvel heroes who teach him about Thanos' powers. Naruto then trains hard, combines his ninja skills with new knowledge, and in a final epic battle, he manages to kill Thanos. The story could also include Naruto's internal struggle as he is in a completely different world with different rules and enemies.
One possible plot twist could be that Naruto's 'godlike' powers are not his own but are the result of some ancient curse placed on Orochimaru that backfires. For example, Orochimaru was trying to gain ultimate power and in the process, he unknowingly transferred a powerful and uncontrollable energy to Naruto. So when Naruto kills Orochimaru, it's like the curse has completed its cycle. Another aspect could be the emotional turmoil Naruto goes through. Even though he has to kill Orochimaru for the greater good, it still weighs on his conscience because Naruto is a character who values all life. He might struggle with the idea that he had to take a life, even if it was someone as evil as Orochimaru.
Well, perhaps in the fanfiction, Naruto kills Orochimaru and the Akatsuki, but it turns out that Orochimaru had a failsafe. His death triggers a powerful curse that starts to affect Naruto and the Hidden Leaf Village. Naruto then has to find a way to break this curse while also dealing with the remaining threats that were associated with the Akatsuki. It could be a race against time to save the village and himself.
In a Naruto kills Thanos fanfiction, Naruto's sealing techniques could play a major role. He could use sealing jutsu to seal away Thanos' powers or even Thanos himself. Naruto has experience in dealing with powerful foes and sealing them away. Also, Naruto has the ability to sense danger and react quickly. Thanos, on the other hand, may underestimate Naruto at first. By the time he realizes Naruto's true strength, it could be too late for him.
One possible plot twist could be that while captured, Harry discovers a hidden power within himself. Maybe it's a new type of magic that he unlocks due to the extreme situation. This power allows him to not only break free from his captors but also gives him an edge over Voldemort. Another aspect could be that the capture was part of a plan all along, by Dumbledore or some other wise wizard, to deceive Voldemort and get Harry in a position where he can deliver the final blow.