Guide to the DC Universe

Heroes such as Superman, the Batman, Wonder Woman, the Flash, Aquaman, Green Arrow, the Question, Black Canary and all the Green Lanterns.
Teams like the Justice League, the Teen Titans, the Justice Society of America, the Birds of Prey, the Outsiders, the Challengers of the Unknown and the Legion of Super-Heroes.
Strange adventurers such as Jonah Hex, Rip Hunter, Swamp Thing, the Doom Patrol and the sorcerer John Constantine. 

All of these folks and many others can be found in the realm of DC Comics. 

Super-Hero and Super-Villain Teams

Cosmic Beings

Races and Organizations

Fictional Places, Planets and Dimensions

Forces, Weapons and Artifacts