Perhaps a fanfiction where the Infinity Stones in the Endgame have an unexpected effect on certain anime characters. These characters start to develop new abilities or forms that are a blend of their anime selves and the power of the Stones. This could lead to a whole new dynamic in the fight against Thanos, as the Avengers have to figure out how to work with these newly - empowered anime allies.
To make the crossover believable, focus on the similarities between the two universes. Both the anime world and the Avengers' universe have characters with extraordinary powers. You can start by establishing a connection like a rift in space - time that pulls the characters from one world to the other. Then, make sure the characters' personalities are consistent. For instance, if an anime character is known for being honorable, they should act that way in the Endgame setting as well.
Endgame originated from the Marvel Comics universe. So, in a sense, it can be considered related to comic books. It brings those comic book elements to the big screen in an exciting way.
Definitely. Endgame is deeply rooted in the world of Marvel Comics. The movie builds upon the existing comic storylines and characters, bringing them to life on the big screen in an epic way.