It's hard to give an exact number. There are a ton of Marvel characters that have been featured in various adaptations, but it changes over time and across different projects.
The X - Men might have mixed reactions. Professor Xavier would likely be intrigued by the potential for better mutant - human relations in the future. However, Wolverine might be skeptical and on guard, fearing that the future holds new threats to mutants. He's always been the more cynical of the group. The different reactions among the Marvel characters would add a lot of depth and interesting plot points to the fanfiction.
Definitely Loki. He's a fan favorite and can easily fit into various crossovers. His mischievous nature can add a lot of twists to a story. For example, if he were to cross paths with the Fantastic Four, he could play all sorts of mind games with Reed Richards while also being intrigued by Sue Storm's powers.
Marvel Comics is filled with amazing characters. For instance, there's Wolverine, who's known for his toughness and regenerative abilities. Then there's Doctor Strange, with his mastery of magic. And let's not forget about the Guardians of the Galaxy, a diverse and fun group.
There are a vast number of Marvel characters in the comics. It's difficult to count precisely because the universe is constantly expanding and evolving. But you can expect it to be in the thousands.
The list of popular Marvel comic characters is long. You've got Wolverine, known for his healing factor and claws. Then there's Doctor Strange with his mastery of the mystic arts. And let's not forget about Guardians of the Galaxy like Star-Lord and Gamora, who have their own adventures in the cosmic realm.
It's hard to give an exact number because new characters are constantly being introduced. But there are thousands upon thousands of Marvel Comics characters.