The Who's Who entries are listed in alphabetical order after character name followed by their real name. In the case of regular names characters are listed first name first, surname second. In some cases characters will be also a comic age/timeline/Earth indication.

Gods and characters that do not have a known secret identity but belong to a group might have the group name noted in brackets after the character name to distinguish the character from other similar named characters.

At present the Original DC Universe era covers both the pre- and post-Crisis on Infinite Earths DC Universe as most of the character's histories were kept intact. The characters whose histories changed dramatically with the original Crisis will have individual profiles. For instance there are listings for both the Golden Age Superman and the Silver Age Superman as well as the listing for the post-Crisis Superman.

As a result of the event known as Flashpoint, the history of the DC Universe was changed. For Who's Who profiles on the characters of the post-Flashpoint DC Universe go here. For a full listing go here