A fanfiction about Hulk and Caiera being pregnant could involve exploring how they prepare for the arrival of their child. It might show Hulk's protective side, as he is a very powerful being. He would likely be extremely vigilant in safeguarding Caiera and their unborn baby. For example, he could be on high alert against any potential threats from his many enemies in the Marvel universe.
One way the storyline could develop is by having them face challenges related to their different natures. Hulk's uncontrollable rage at times and Caiera's more composed self might create some tension during the pregnancy. For instance, Hulk might accidentally cause a dangerous situation due to his lack of control, and Caiera has to calm him down.
The Avengers originated in Marvel Comics. Marvel has developed a vast universe of characters and storylines, and the Avengers are a key part of it. Their adventures have been adapted into various forms of media, including movies and TV shows.
Captain Marvel is Carol Danvers. She gained her powers through an interaction with alien technology and has become a powerful hero in the Marvel universe.
Marvel justifies Marvel Comics 1000 by presenting it as a celebration of their rich history and a platform to introduce fresh and exciting story arcs. It could also be a strategic move to attract new readers and reignite the passion of long-time fans.