Justice League was the first chance to add Wonder Woman (voiced by Susan Eisenberg) to the DCAU, as the rights had been previously tied up in possible movies and television series.
To introduce her into a universe already populated by long-experienced heroes like Batman and Superman, Bruce Timm and his team took a cue from George Pérez’s newcomer-to-man's-world Post-Crisis interpretation. This Diana started off completely innocent and ignorant of man's world. And as with the Pérez version, she neither keeps a secret identity nor has an invisible plane (although in the Justice League Unlimited first season episode "For the Man Who Has Everything", we see her unveil the plane). Also in this series, her traditional bullet proof bracelet cuffs became bullet proof vambraces. However, perhaps as a nod to her Pre-Crisis appearance, she has straight hair and high-heeled boots suggestive of her old Super Friends incarnation. Also, her lasso did not compel truthfulness until the Justice League Unlimited episode "The Balance" in which Hippolyta activated her true power.
Her initial personality consisted of a strict adherence to Amazonian dogma (prompting some of her teammates, especially the more brash and headstrong Hawkgirl, to react to her attitude by calling her "Princess" somewhat disdainfully). Noticeable though is the effect of Man's World on Diana. Her first appearances are marked by her reflexively acting off of Amazonian ideology (in "Fury", she questions how necessary men really are), but as time passes, she becomes more interested in men (in particular, Batman, with whom she has a flirtatious and possibly romantic relationship) and experiences the emotional excesses of man's world, as compared to the Amazons (who are portrayed as somewhat stoic if not emotionally stunted). Batman's affections for Wonder Woman, however, are somewhat confirmed in the Unlimited episode "This Little Piggy", where he admits his feelings to Zatanna when requesting her help in changing Diana back (she was turned into a pig by Circe). Batman's and Wonder Woman's mutual feelings are implicated in the JLA episode "The Brave and the Bold", when Wonder Woman manages to stop a missile crashing into Gorilla City. When the weight of the missile head crushes her, Batman rushes to the site and attempts to clear the rubble while everyone else is too stunned by Wonder Woman's possible death to help. However, Wonder Woman is found unhurt, and when she sees Batman's gloves covered in dirt in his attempt to save her, she kisses him on the cheek. Batman and Wonder Woman share a kiss in the Justice League season finale "Starcrossed" (they kissed in order to hide their faces from Thanagarian patrol). In the episode "Kid's Stuff", Wonder Woman, in her eight-year-old form (voiced by Dakota Fanning), also flirts liberally with the young Batman, who acts as miniature version of his adult self, either ignoring or being embarrassed by her advances.
She finds joy but also discovers a temper that frequently needs to be checked by her teammates ("Hereafter", "Hawk and Dove", "Eclipsed", etc.). Later episodes dealt directly with her temper and Diana’s eventual mastery of it. She since adopted the role of ambassador of the Amazons at her mother’s request ("To Another Shore"), bringing another Post-Crisis trait to the DCAU.
While Wonder Woman’s origin in the DCAU is not detailed, in the episode "The Balance", it is revealed that she indeed was a clay statue sculpted by Hippolyta and somehow brought to life. In the same episode, Hades says that he helped Hippolyta sculpt the clay statue that would eventually become Diana, making him feel almost like a father to her, but was banished before she was brought to life. That claim, however, was never substantiated (when Hawkgirl points out she could use the lasso on him, Diana says it doesn't matter). It was revealed that the Wonder Woman armor was originally made by the god Hephaestus for her mother, Queen Hippolyta, not Diana. However, in episodes, again like "The Balance", it was insinuated and implied that the armor was eventually made for her purposes and use. She had stolen her armor to use once Hippolyta forbade her to enter the outside world. Later in the series it is revealed that Diana did not know that the armor had additional abilities, which could be activated by pressing the star on the tiara.
Steve Trevor made an appearance in the first season's three-part finale, "The Savage Time", when the League time-travels back to World War II in order to stop Vandal Savage changing history. In this story, Steve is an agent of the OSS, whom Diana falls in love with. They are separated when Diana goes to stop Savage's invasion of America and returns to the present day. In the episode's conclusion, she visits her friend, now a very old man, at a retirement community.
Wonder Woman's eventual fate is unknown, but Kobra mentions that she is still alive during the time of Batman Beyond. She was originally supposed to appear in the Batman Beyond episode "The Call", which featured a future Justice League. However, rights issues precluded the possibility and her cameo was instead taken by Big Barda. She returns in the Justice League Beyond 2.0 comic, which is set some years after the conclusion of the Batman Beyond series.
Her powers are almost the same as her comics counterpart, including flight and super strength, lending Wonder Woman the ability to hold out against Superman in a fight, while both were hallucinating. She has a weakness to pierce wounds as shown by Devil Ray's poisonous dart harming her. In "Grudge Match", she is able to singlehandedly defeat Vixen, Hawkgirl, Huntress and Black Canary in a no-holds barred fight.