Wonder Girl

Origin
Donna Troy was an orphan rescued from a burning building by Wonder Woman as a baby. With no known living family, Wonder Woman brought her to Paradise Island to be raised as an Amazon by her mother, making her Diana's adopted sister.

Becoming Wonder Woman's Sidekick
Starting as a Wonder Woman doppelgänger and later sidekick, Donna Troy grew up to become an essential part of the Wonder Woman mythos and a pivotal member of the original Teen Titans. Reinvented in the New 52 as the misguided "perfect Amazon", created by a vengeful former friend of Hippolyta's to take away the Amazonian throne from Wonder Woman.

Teen Titans
In The New Teen Titans, with original members Wonder Girl, Robin, and Kid Flash joined by new heroes Raven, Starfire, Cyborg, and Beast Boy / Changeling. Donna is romantically involved with much older professor Terry Long, but along the way is put under the romantic spell of Hyperion, one of the Titans of Myth.

In "Who is Donna Troy?" Robin investigates the events surrounding the fire from which his old friend had been rescued as a toddler, discovering that Donna's birth mother was Dorothy Hinckley, a dying unwed teen who had placed her for adoption. After Donna's adoptive father Carl Stacey had been killed in a work-related accident, her adoptive mother Fay Stacey placed her for adoption again, unable to raise the toddler because of mounting expenses. However, Donna became victim to a child selling racket, which ended with the racketeers dying in a fire. With Robin's help, Donna is reunited with Fay, who had married Hank Evans and given birth to two additional children, Cindy and Jerry. Donna marries Terry Long in a huge, lavish ceremony in Tales of the Teen Titan