If you do that in a fanfic, expect a wild ride. The mercenary could team up with others to get back at you, or the spider could be a key to a hidden treasure and your messing with it sets off a chain of dangerous events.
The fanfic might revolve around Harry's interaction with the Goblet of Fire due to a misunderstanding. He could think that the goblet is being influenced by dark magic and decides to investigate. As he messes with it, he discovers some hidden secrets about the Triwizard Tournament and its origins. This could lead to him having to make difficult choices to protect the integrity of the tournament and Hogwarts, all while dealing with the consequences of his meddling with such a powerful magical object.
Well, initially, the Avengers might underestimate Spider - Man. They think he's just a kid in a suit. But Spider - Man quickly shows them his skills. He could start by taking out Hawkeye's arrows mid - air with his webs. Black Widow would try to use her combat skills against him, but Spider - Man is too fast. The fight could then move to a more strategic level. The Avengers could use their combined powers to try and trap Spider - Man. However, Spider - Man's intelligence and quick thinking could help him find a way out. Eventually, they might realize they've been misled and join forces with Spider - Man.
He might use his magical skills in unique ways. For example, he could use spells like 'Stupefy' to incapacitate his enemies quietly before engaging in close - combat. His broomstick flying skills could also be adapted for quick getaways or aerial surveillance in mercenary missions.
Another possibility is that a new member of the Avengers might suspect Spider - Man's identity and start investigating. This could create a lot of tension within the team as Spider - Man tries to keep his secret while the other member gets closer to the truth. It could also lead to a sub - plot where the Avengers are divided on whether to respect his privacy or force him to reveal his identity if they think it's a threat to the team.
They could exchange their experiences of being a superhero. Spider Man has been through a lot in his own world, and Spider Woman would have her own set of challenges. Sharing their stories could help them grow as heroes and also deepen their connection.
They might team up to fight a common enemy. In fanfiction, it's often about them combining their unique skills. Spider Gwen's acrobatic style and Spider Man's quick - wittedness would make for an awesome duo against villains like the Green Goblin or Doctor Octopus.
In fanfiction, if Spider Man was experimented on, he might gain new powers. For example, the experiment could enhance his existing spider - like abilities to an extreme level, like being able to swing between buildings at supersonic speeds or having a much stronger spider - sense that can predict events hours in advance.
A 'Spider Man disappear' fanfiction could explore many aspects. For example, Peter Parker's friends and family would be deeply affected. MJ might be heartbroken and start her own investigation. Meanwhile, the scientific community in the story could be looking into the strange phenomenon of his disappearance. There could also be a sub - plot where a young fan of Spider Man decides to take matters into his own hands, inspired by the hero, and tries to find out what happened, even though he has no superpowers. This could show the impact Spider Man had on the city not just as a protector but also as an inspiration.
Maybe in the 2018 fanfiction, the 2023 Spider - Man meeting could be a reunion of all the Spider - Man versions from different universes. They might come together to fight a new and powerful villain that threatens all the universes.
If Mercenary Naruto fought the Justice League in a fanfic, Naruto would be at a disadvantage in terms of raw power. The Justice League has members with god - like powers. However, Naruto's unpredictability and his ability to adapt in battle could give him an edge. He could potentially use his chakra to disrupt the League's technology if they rely on it. Also, his experience in close - combat ninja battles might help him against some of the League members who are more used to using their powers from a distance.