I'm not sure who the absolute best is, but there are some well - known names in the fanfiction community. Some authors who have a good reputation for writing about superheroes in general might also write great Spider - Man and Lizard stories. You can check out fanfiction platforms and look for those with high ratings and lots of reviews for their Spider - Man and Lizard works.
One plot idea could be that the Lizard is actually being controlled by an evil scientist who wants to use him to take over the city. Spider - Man has to figure out how to break the control and save his enemy. Another could be a story where the Lizard has a moment of self - awareness and teams up with Spider - Man to stop a greater threat. For example, a group of aliens that are attacking the city and both of them realize they need to work together.
Perhaps the Lizard's story in Spider - Man 5 will explore his origin more deeply. It could show how he became the Lizard in the first place and what his true motives are beyond just causing chaos. Also, Spider - Man might have to develop new strategies to defeat him as the Lizard could be smarter and stronger than before.
There have been instances where Spider-Man and Captain Marvel have squared off in the comics. It usually depends on the circumstances and the overall narrative of the comic series.
In some fanfictions, the winner isn't really about who is more powerful physically or technologically. It could be about who has the stronger will or the better moral compass. For example, if Iron Man realizes that he's in the wrong during the fight, he might back down, making Spider - Man the 'winner' in a sense. Or if Spider - Man is able to convince Iron Man of a greater good, the fight could end without a clear physical victor.
Well, it could start with Spider - Man being framed for a crime he didn't commit. The Avengers believe in his innocence. They fight for him against a corrupt government agency that wants to arrest him. Along the way, they discover that there's a bigger conspiracy at play. Black Widow uses her espionage skills to gather intel, Hulk provides the brute force when they face the agency's armed forces, and the other Avengers contribute in their own ways to clear Spider - Man's name and protect him from harm.
Power struggles can be a reason. Spider Man, being a solo hero with his own set of powers and moral code, might not agree with Shield's more bureaucratic and sometimes secretive ways of handling things, so they clash. For example, Shield might want to control Spider Man's actions, which he resists. This can lead to a fight. Also, there could be a villain manipulating events behind the scenes to make it seem like Spider Man is against Shield or vice versa.
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.
Well, it could be an interesting idea. On one hand, the Avengers are a powerful group, and pitting them against Spider - Man could create some intense battles. It would also allow for exploring different power dynamics and relationships. However, it might seem a bit odd since Spider - Man is often seen as a hero among heroes. But if the fanfic has a good backstory, like some misunderstanding or an outside force manipulating the situation, it could work really well.