Goddess Westa is a central figure in the anime Avenger, serving as one of the two primary rulers of a post-catastrophic Mars. She is a member of the "Original Dozen," the first group of colonists who settled the planet and, through unspecified life-lengthening technology, have lived for an extremely long time without aging. Within this ruling structure, she shares authority with her partner, Lord Volk, though their methods and philosophies are markedly different.

In terms of appearance, Westa is depicted as an adult woman with long, blonde, wavy hair that reaches past her hips and brown eyes. Her attire typically includes a dress, sandals, and a tiara, befitting her status as a revered figure.

Personality-wise, Westa stands in stark contrast to the tyrannical Volk. She is characterized by a peaceful and caring nature, showing genuine concern for the welfare of the Martian populace. This compassionate approach has led the people of the planet to revere her almost as a literal deity, seeing her as a goddess who grants peace to souls, in contrast to the fear inspired by Volk. She is portrayed as a melancholic figure, often contemplative and seemingly resigned to the harsh decisions made by her counterpart, whom she does not usually openly contradict. Her dialogue reflects a philosophical and sorrowful outlook, focusing on the cruel and unstoppable nature of time that washes away feelings and lives.

Westa's primary motivation stems from her deep care for the survival and well-being of the remaining humans on Mars. While Volk is willing to resort to extreme, even murderous, tyranny to conserve resources for what he sees as the greater good, Westa consistently advocates for peaceful and communicative solutions. However, despite her moral superiority and greater popularity among the people, she wields less effective power and often appears sadly conformed to Volk's decisions, suggesting a complex dynamic where she is either unable or unwilling to directly oppose him.

Her role in the story is that of a secondary but crucial cast member who represents the benevolent possibility of leadership on Mars. She and Volk monitor the journey of the protagonist, Layla Ashley, a gladiator seeking revenge. Westa demonstrates an unusual awareness of Layla, going so far as to refer to her as "the predestined child," hinting at a deeper connection to the protagonist's mysterious past and her destiny. Their relationship is one of distant observation and guarded interest, as Westa seems to understand that Layla's presence signals a significant change for their world. Her key relationship is with Volk, her ruling partner and a well-intentioned extremist whose dark actions she does not condone but seems resigned to. This relationship defines her position as a passive, sorrowful counterweight to his active tyranny.

Westa does not undergo a dramatic personal transformation. Instead, her development is revealed through her growing recognition of Layla's significance and the unfolding of past events connected to the Original Dozen. Her character serves as a steady, mournful observer of the inevitable changes brought about by the "stream of time". Her primary notable abilities are not physical or combative. Instead, they stem from her agelessness and the resulting experience, as well as the profound spiritual authority she holds over the people, who view her as a divine figure. She may possess unique knowledge of the planet's history and the true nature of characters like Layla, which she hints at but does not fully explain.