Real Name: Dinah Laurel Lance
Alias: Black Canary, " The Blonde Bombshell"
First Appearance: Flash Comics #86
Modus Operandi: World class martial artist, costumed crime fighter, florist
Powers/Equipment: Deadly sonic scream capable of stunning or even killing opponents. Custom motorcycle.
Backstory: The history of Black Canary is a convoluted one. Originally a Golden Age, WWII era member of the JSA, Dinah grew disillusioned with her home dimension after the death of her husband. After a crossover adventure with the JLA, she decided to stay on Earth 1.
Here, she became a long time member of the JLA, eventually falling for her dashing teammate, Green Arrow. The two became an item soon after.
The story gets a little more complicated after the Crisis on Infinite Earths. Now, the WWII Black Canary and her modern counterpart separate people. In this case, a mother daughter pair. Young Dinah grew up surrounded by super-heroics, and dreamed of taking up the mantle herself one day. Her mother objected, but Dinah soon found herself helping to found the JLA.
One day, while attempting to break up a drug smuggling ring, Dinah was captured and tortured. Her lover, Green Arrow, eventually rescued her, killing her captors in the process. This event would haunt both of them for years to come. As a result of her injuries, Dinah lost her Canary cry, becoming a normal (if exceptionally dangerous) person for the first time.
She and Ollie stayed together for some time, but eventually broke it off after she caught him making out with a Green Arrow groupie. She struck off on her own, joining up with her childhood "aunts" and "uncles" in the JSA. She moved from that to a long stint in Oracle's Birds of Prey organization. (During this period Dinah was exposed to a Lazarus Pit, restoring her Canary Cry).
Eventually, after the death and rebirth of Oliver Queen, the two got back together as a couple. Recently, Ollie asked for Dinah's hand in marriage, and she accepted. Although their wedding interrupted by a super villain attack, and she ended up killing a shapeshifter posing as Green Arrow, the two are now a happy couple. Currently, she's assisting Green Arrow in recovering his son, Connor from unknown kidnappers and serving as the first chairwoman of the Justice League of America.