Kyle Rayner is a high ranking member of the Green Lantern Corps from Earth. After the rest of the Corps was destroyed, he alone was selected to bear the last power ring and carry on the title. Although he acted alone for many years, when the Corps was reformed, his skill level gave him a position as an Honor Guard, only behind Salakk and the Guardians in the chain of command of the Corps. He has also been a host for the Ion entity, and a member of the Justice League.
Power Girl is the Earth-Two equivalent of Supergirl, native Kryptonian and cousin to Superman. Her origins have changed several times in continuity when the Multiverse was erased Post-Crisis, and she has also been seen as a descendant of Arion with ties to Atlantis. The distinctive costume she wears lacks an emblem, and she uses this as an advantage to distract others in combat. She has been a member of the Justice League, the Justice Society, Infinity, Inc., Birds of Prey, the Suicide Squad and the Sovereign Seven.
The X-Men are mutants, a subspecies of humans who are born with superhuman abilities. The X-Men fight for peace and equality between normal humans and mutants in a world where antimutant bigotry is fierce and widespread. They are led by Charles Xavier, also known as Professor X, a powerful mutant telepath who can control and read minds. His oldest friend is Magneto, a powerful mutant with the ability to generate and control magnetic fields. Professor X and Magneto have opposing views and philosophies regarding the relationship between mutants and humans. While Professor X works towards peace and understanding between mutants and humans, Magneto views humans as a threat and believes in taking an aggressive approach against them, though he has found himself working alongside the X-Men from time to time.
Selina Kyle is Catwoman, a adventurer who's been both a super-hero and super-villain. Beginning her career as a thief and enemy to Batman, she later turned to crime-fighting and became part of the Batman Family. Despite her villainous nature, she works hard to protect the East End of Gotham City.
The original Batwoman, Kathy Kane, acted as a female counterpart to Batman with her side-kick Bat-Girl and romantically pursued Batman.
In the modern era, her legacy is taken up by the army brat Kate Kane. She is Bruce Wayne's cousin - her father Jacob Kane being the brother of Martha Kane Wayne, Bruce's mother. Kate Kane has been involved with the Batman Family, Batman Incorporated, and the Female Furies.
Supergirl is Kara Zor-El, Superman's cousin from the planet Krypton and one of the most powerful heroes in the universe. She has been a member of the Justice League, the Legion of Super-Heroes and the Red Lantern Corps. The "Supergirl" moniker is a legacy name also used by other female super-heroes involved with Superman and the Superman Family like Matrix, a shape-shifting creature from a Pocket Universe who would later fuse with a woman named Linda Danvers developing angelic powers.
While the majority of the active roster of the Avengers were kidnapped and forced to participate in the Secret Wars, longtime member Vision declared himself chairman in chairwoman Wasp's absence. He had detected a great threat to come, the Dire Wraiths, and in order to better combat the threat, decided to establish a second active team of Avengers. He requested and received permission to do so from the U.S. government, which had begun to take a more active supervisory role towards the Avengers. Recently returned veteran member Hawkeye was appointed as chairman of the West Coast roster.
Jessica Drew was born to Jonathan Drew and Miriam Drew. Experimented on by Hydra, she was sent to kill Nick Fury. After being shown the true nature of Hydra, she fled the scene and would later would come back as a hero, bounty hunter, private investigator, and finally as a member of the Avengers.