Ethana is a lieutenant in the Royal Army of the kingdom of Uruk and serves as a supporting character in the series. Her background is rooted in her military career, where she operates under the direct command of her superior, Kelb, to whom she is deeply loyal. Despite her position within the rigid structure of the royal military, she displays a pragmatic and open-minded nature, particularly in her interactions with the show's protagonists. Unlike some of her comrades, she is not dismissive of the climbers who challenge the Tower of Druaga and even demonstrates her support for Jil's quest. Her commitment to his cause is made concrete when she provides him with a bag of gold, hoping that the funds will help him recruit more members for his party.

On the surface, Ethana appears to be a disciplined and obedient soldier, especially when in the presence of high-ranking officials such as Amina and King Gilgamesh's advisors. However, this outward compliance conceals a more discerning and principled inner character. She secretly nurtures serious doubts concerning King Gilgamesh's true condition and his ability to continue ruling the kingdom effectively, suggesting she is not blindly loyal but rather evaluates the morality and competence of those she serves. Her motivations are initially presented as being tied to her duty to the army and her king. When asked about her reasons for ascending the tower in search of the Blue Crystal Rod, she cites this loyalty as her primary drive. Yet she also reveals a more personal and human side, admitting that she finds genuine enjoyment in her travels and adventures alongside Kelb, indicating that her journey is not solely about duty but also about camaraderie and purpose.

Her role in the story evolves significantly from a background military officer to a key figure in the political upheaval of Uruk. While she survives the catastrophic events of the first season, including a massive waterfall unleashed within the tower, she continues to serve in the Royal Army in the sequel, The Sword of Uruk. Her most pivotal act comes when King Gilgamesh undergoes a dramatic transformation, becoming a ruthless tyrant. In response to this drastic change, Ethana abandons her passive obedience and takes a bold stand, leading a rebellion against the king. This development showcases her growth from a loyal lieutenant into a decisive leader willing to defy authority for the greater good. Her key relationships are central to her narrative arc. Her bond with Kelb is the most significant, as she serves him loyally throughout their military service and their adventures. The culmination of her personal journey and her connection with Kelb is seen at the end of the series, where the two reunite and ultimately marry. Regarding her combat abilities, no specific information is available.