When was the character Zatanna Zatara first introduced?
Zatanna
Created by writer Gardner Fox and artist Murphy Anderson, Zatanna first appeared in "Hawkman" #4 (November 1964). When she is introduced, she is on a quest to find her father Zatara who made his first appearance in "Action Comics" #1 but had not been published regularly for several years. The storyline crossed multiple comics published by DC at the time, culminating in issues of "Justice League of America", also written by Fox.
Bizarra
In 1985, DC Comics introduced a storyline titled "Crisis on Infinite Earths". That company-wide story arc erased the established history of almost all DC Comic's characters. Bizarra was then re-introduced as part of an all new Bizarro Justice League team (which included Bizarro, Batzarro, Bizarro Flash, Bizarro Hawkgirl, and Bizarro Yellow Lantern). They live on the cube-shaped planet Htrae which is populated entirely with Bizarro-type humans. At one point, Bizarro Hawkgirl tied up Bizarra (in that story referred to as "Wonder Woman") with her own lasso. It was explained that Bizarra's lasso had the ability to force anyone tied by it to tell only lies. Bizarra seemed to be romantically interested in Bizarro but the feeling was not shared as Bizarro was in love with his world's version of Lois Lane only. During the storyline, it was shown that due to exposure to Htrae's blue sun, Bizarro gained the ability to create new Bizarro life-forms. Whether Bizarra was created by Bizarro or was a pre-existing character is unclear.