Zeta was born as Lilim in one of the most prestigious tribes of the therianthropes, the Golden Leopard Tribe. Even the King of the Therianthrope would have to show deference to someone who was a member of that tribe. She is the direct descendant of the "Therianthrope Hero" Lili, who defeated the demon Diablos, which makes her bloodline and family exceptionally well esteemed, even among the Golden Leopard Tribes. Many settlements followed the Golden Leopard Tribe, and she was the eldest daughter of the chieftain who had ruled the tribe for time immemorial.
Despite being a Therianthrope, who is mostly known for being wild brutes, Zeta is smart and level-headed. While she still prone to getting into fights, she isn't as much of a "loose cannon" as Delta. She has also shown to be a tomboyish loner, usually doing her missions on her own and only cooperating on a team if the situation demands it.
Compared to the rest of the Seven Shadows, the hatred that Zeta feels for the Cult of Diablos is so great and far more intense that she is so determined to do whatever it takes to achieve the Cult's destruction, which leading her to be even more extreme in her actions that she is willing to sacrifice anyone in order to achieving her mission that she would allow mass casualties to occur.
Zeta truly wants Shadow Garden to rule over the world with Shadow as its new god once he attained immortality (Oblivious to Shadow's actual feelings on the matter) to ensure that humanity won't make the same mistakes again. Because she had seen how hopeless humanity is for their unintentional role in bringing the Cult to power, Zeta is far more willing to allow collateral damage to occur.
Like her fellow Therianthrope, she also dislikes undergarments as she finds that they restrict her movement and thus she does not wear them.