Diana is a very kind, loving, compassionate, and strong-willed person, who, while initially somewhat naive, has become all the wiser through her time in Man's World. An outspoken egalitarian, she fights for what she believes in and generally for the betterment of mankind through love and mutual understanding, as taught to her by her mother and fellow Amazons. Growing up, Diana also proved herself headstrong and determined to do what she wanted, such as training in hand-to-hand combat under her aunt Antiope's tutelage despite her mother initially forbidding it. In this way she is quite stubborn; if she believes something is the right thing to do, then she will do it - as evidenced by her attempt to leave Themyscira without her mother's permission and insistence in attending Ludendorff's gala despite Steve telling her not to. Alongside her kindness and compassion, however, Diana was also a very naive idealist when she first arrived in "Man's World", blindly believing that all men were corrupted by Ares and that the World War I Central Powers would simply abandon their sinister ways if she killed him. This blind naivety also translated to explicit indignation whenever she was treated with disrespect due to her status as a woman, such as when she was ignored by members of the War Office. Alongside this, Diana also voiced her opinions rather bluntly upon her arrival, such as when she perceived Etta Candy's job as Steve Trevor's secretary to be akin to slavery (which earns Diana Etta's admiration). Despite her outspokenness and behavior in Man's World, however, Diana remained caring and compassionate, as demonstrated by her initially rocky relationship with Charlie and willingness to step into No Man's Land to save the village of Veld.
The American theme of Diana's costume was explained by Pérez in the Challenge of the Gods storyline in which Diana engaged in a series of trials arranged by Zeus as punishment for refusing his advances. Diana met the spirit of Steve Trevor's mother, Diana Trevor, who was clad in armor identical to her own. Trevor revealed that during World War II she had crashed on Themyscira while on duty as a U.S. Army pilot. She blundered into an Amazon battle against Cottus, a multi-armed demon, at the portal to the underworld. Trevor was drawn into the battle, although she was armed only with her side arm. She wounded the beast before suffering a mortal blow, allowing the Amazons to reseal the portal.
Zeus has made a woman called Zola pregnant. Hera, due to this, is furious. She sets out to kill Zola, but Hermes finds her first, only to find out that Zola does not want to come with Hermes. Zola opens the door, and an arrow is shot at her direction; Hermes pushes her away in time, and gives her a key, as assassins sent by Hera and it teleports to Wonder Woman’s apartment, because Hermes enlisted Wonder Woman to protect Zola. Zola gives Wonder Woman the key, and it teleports both Wonder Woman and Zola back to Zola’s house. After Zola finds out that she is pregnant with Zeus, it gets revealed that one of Zeus’ children is going to take his place, by Zeus’ own will. Wonder Woman takes Zola, along with Hermes, to Themiscyra where Diana explains to her Mother, Queen Hippolyta, why she took with herself Zola and Hermes to Themiscyra. Alongside all of this, Hippolyta tells Diana about her true origins; that her real father is Zeus. Diana’s reaction to this isn’t very well, so she decides to abandon Themiscyra. Hera is aware of the fact that Wonder Woman is Zeus’ daughter, and she arrives to Themiscyra, furiously. Wonder Woman realized she did a mistake by leaving her home, so she went back to Themiscyra where she sees that everyone has been turned into snakes by Hera, except for Hippolyta, she was turned into stone. Apollo arrives in a bar searching for War (Ares), and explains to him that Zeus doesn’t even exist from what he’s sources says. Apollo takes this as his chance to become the king of Olympus and the Gods.
Diana and Trevor arrived at the British War Council's meeting place. Trevor told her to stay behind while he retrieved one of his superiors from the war room. Curious, she followed him into the room, where dozens of men argued with each other while Sir Patrick Morgan struggled to be heard. The room fell silent as the men noticed Diana, as women were not allowed in the room; Trevor quickly escorted her out.
Diana confronts Steppenwolf, before Cyborg attacks him, which leads to Wonder Woman fighting Steppenwolf. As Flash helped Cyborg get to the Mother Boxes, he takes care of the Parademons. While Cyborg tries to separate the Mother Boxes, Batman saves Flash by grappling his legs from stopping him from falling: Batman takes one of the Parademons' guns and fires at them. Steppenwolf finds out that Cyborg is trying to separate the Mother Boxes, which he grabs him before Wonder Woman saves him.
Gaines decided he needed another expert. He turned to Lauretta Bender, an associate professor of psychiatry at New York University’s medical school and a senior psychiatrist at Bellevue Hospital, where she was director of the children’s ward, an expert on aggression. She’d long been interested in comics but her interest had grown in 1940, after her husband, Paul Schilder, was killed by a car while walking home from visiting Bender and their 8-day-old daughter in the hospital. Bender, left with three children under the age of 3, soon became painfully interested in studying how children cope with trauma. In 1940, she conducted a study with Reginald Lourie, a medical resident under her supervision, investigating the effect of comics on four children brought to Bellevue Hospital for behavioral problems. Tessie, 12, had witnessed her father, a convicted murderer, kill himself. She insisted on calling herself Shiera, after a comic-book girl who is always rescued at the last minute by the Flash. Kenneth, 11, had been raped. He was frantic unless medicated or “wearing a Superman cape.” He felt safe in it—he could fly away if he wanted to—and “he felt that the cape protected him from an assault.” Bender and Lourie concluded the comic books were “the folklore of this age,” and worked, culturally, the same way fables and fairy tales did.
Wonder Woman’s appearance in the early golden age of comics made her the first prominent female superheroine. The psychologist William Moulton Marston created Wonder Woman somewhat as a counter reaction to the presence of prominent male superheroes (at this time Superman, Batman and Captain America), as well as a counterbalance to the "blood curdling masculinity" that was dominant at the time, with the hopes that the character could serve as an inspiration for young children (though in certain ways it was geared more towards female readers.) Marston had been partially motivated to create this character because of the accomplishments of his own wife, who was also an accomplished academic at a time when it was difficult for women to fulfill this role. As a result, the first Wonder Woman series contained many complementary articles and features which sought to highlight the inner power of women. There were articles for instance on the different career paths that women could pursue (according to the standards of the 1940s) as well as a series of stories on famous and accomplished women, called the Wonder Women of History. Marston introduced the character in All-Star Comics #8 in 1941. She became the lead character in Sensation Comics in 1941, and got her first solo book in 1942.
Hermes attacked Wonder Woman there, refusing to simply give up the child, but during their battle, War ripped the baby from Demeter's womb and disappeared. Unable to let a grave wound such as that go unattended, Diana saw to Demeter first, and the goddess warned that War could not be trusted. Worriedly, Diana and Orion returned to Manhattan to find that War had returned the baby to Zola. At last, the baby and his mother were reunited - and Orion would not have to look any further for the child he needed to kill.