Writing a story involving multiple characters is never easy. Heck, it’s hard enough writing a story about one main character, knowing there are going to be secondary characters moving in and out of their story. But the bar gets raised when — to the writer’s surprise — several supposed secondary characters begin to cry out for attention.
This is what I call the “Justice League Effect.”
In the comic book world, there are two types of superhero comics: solo titles and team books. Some characters (think Superman, Batman, and Wonder Woman) are big enough to anchor one or more solo titles. But other characters never have enough fan support to manage it.