Crisis on Infinite Earths in the comics concludes with a battle of epic proportions. Heroes unite from different realities and, in the end, the fabric of the multiverse is altered in ways that have long-lasting effects on DC Comics.
One of the main storylines is the multiverse in peril. Many different Earths from the DC universe are at risk of being destroyed. Another is the gathering of heroes from various Earths to try and stop the destruction. For example, heroes like Superman, Batman, and Wonder Woman from different versions of their respective Earths come together, each with their own unique abilities and challenges they bring to the fight against the cataclysmic event that threatens all of existence.
The main way it ruined DC Comics was that it threw the established order into chaos. It made it hard for new readers to jump in and for long-time fans to keep up. Plus, it seemed to sacrifice character development for the sake of a big event.
In Crisis on Infinite Earths comics, not many Supermen die. Usually, it's a limited number, and the focus is more on the overall story and multiverse chaos.
Superman is a very notable character. His strength and leadership play a crucial role in the events of the story. Batman is also important. His strategic mind helps in the fight against the threat to the multiverse. And Wonder Woman, with her combat skills and sense of justice, is a key figure among the heroes in this graphic novel.
One idea could be exploring the backstories of minor characters during the Crisis. For example, how the normal people on different Earths are coping with the chaos.