Overall, there are similarities, but the movie version of Mysterio also has some differences and updates to fit the cinematic universe. For example, his motivations and backstory might have been tweaked for the big screen.
It's not a true story. Usually, such titles are imaginative creations crafted by authors or filmmakers to tell an engaging tale. The plot and characters might be inspired by various elements but not based on real events.
It's likely about the Sinister Six, a group of supervillains. They usually team up to take on a superhero, often Spider - Man. The graphic novel might detail their origins, their evil plans, and their battles against the forces of good.
A really good Sinister Six story is the one where they faced off against a powerful hero. The way they strategized and coordinated their attacks, despite their differences, was fascinating. It was a battle of wits as much as it was of strength, and seeing how the hero countered their every move made the story exciting.