What are some of the major characters that are key to understanding the DC Comics timeline?

Several characters are fundamental to the DC Comics timeline. Superman, Batman, Wonder Woman, and Flash are core figures who have been central to the universe's narrative for decades. Other important characters include Green Lantern, Aquaman, Martian Manhunter, and the Justice League. Understanding the history and relationships of these characters is essential for grasping the broader context of the timeline.