I would cast Tom Hiddleston as the main villain. He has already played Loki in the MCU and has proven his ability to be a complex and engaging villain. His charm and acting skills could bring a new level of menace to an Avengers fanfiction.
I think Jared Leto could be an interesting choice. He has a very unique look and acting style. In an Avengers fanfiction, he could play a villain who is unpredictable, with a wild and erratic personality. His presence would add an element of chaos to the story, and he could create some really intense and memorable scenes against the Avengers.
I'd pick John Boyega. He has the ability to bring a lot of energy and heart to a role. In an Avengers fanfiction, he could be a new Avenger with a unique power, maybe something related to energy manipulation. He would be the kind of character who is not afraid to speak his mind and would add a fresh perspective to the team.
Well, it could involve the Avengers getting lost in our world and finding the cast of the Avengers movies. The actors might think it's some sort of elaborate prank at first. Then, they could team up. The Avengers could learn about how they are portrayed in the movies from the actors, which could lead to some humorous or even heartwarming moments.
It could be Doctor Octopus. He's always been a formidable foe for Spider - Man. In this fanfiction, he might have a plan that involves not just Spider - Man but also threatens the Avengers in some way, so they have to fight him to protect Spider - Man.
Thanos could also be a good option. Imagine Bella's planet holds one of the Infinity Stones that Thanos needs. He would stop at nothing to get it, and Bella and the Avengers would have to join forces to protect it. Thanos' brute strength and strategic mind would pose a huge challenge for them.
A powerful necromancer could be a great main villain. He tries to control the ghostly avengers for his own evil purposes, using dark magic to manipulate them.
One great 'Avengers Cast Fanfic' is 'The Avengers Backstage'. It offers a really fun take on the behind - the - scenes interactions of the cast. It has a lot of humorous moments and some really sweet friendships depicted among the actors.
One great 'avengers cast x reader fanfiction' is the one where the reader is a new recruit at S.H.I.E.L.D. and catches the eye of several Avengers cast members. It has a really engaging plot that shows how the reader interacts with them in a professional yet personal way.
Iron Man and Robert Downey Jr. would likely have interesting interactions. Iron Man is known for his wit and charm, and Downey Jr. has a similar personality. They could exchange some clever banter and perhaps even discuss how Iron Man's character has evolved over the movies.
The Avengers might be initially cautious around the cast, not fully understanding who they are. The actors, on the other hand, would probably be star - struck. For example, Robert Downey Jr.'s character in real life might try to crack jokes with Iron Man. And Thor might be a bit confused by the concept of actors playing him.
It could be Loki. He might have some new trick up his sleeve where he makes the Avengers forget Tony as part of a bigger scheme to cause chaos among the team and weaken their defenses. He could be planning to take over the world while the Avengers are distracted by this strange memory loss.