Elizabeth S. Altar is a secondary character in the anime and light novel series. She is identified as the second princess of the Kingdom of Altar, a position that places her among the most important non-player characters, known as tians, within the realm's political structure. While her sister is the first princess named Altimia and serves as the current leader of the country, Elizabeth herself holds significant royal responsibility.

In terms of personality, Elizabeth is portrayed as having a resolute and determined nature. When faced with disappointment, such as when her sister is unable to attend an important event due to illness, she chooses not to dwell on circumstances beyond her control. Instead, she focuses her energy on fulfilling her own duties and ensuring the success of the event at hand, hoping that her efforts will be of help to her sister. This behavior is noted by others as a moment of maturity, suggesting a level of growth and responsibility that goes beyond her usual demeanor. She is also capable of being direct and declarative, openly asking for protection when she feels the need for it.

Her role in the story is closely tied to events taking place within the Kingdom of Altar, particularly in the city of Gideon. She travels to this city to attend a major event known as the Clash of the Superior. Elizabeth is an important figure in these official proceedings, and her presence, alongside Count Gideon and the Royal Guard, underscores her significance in the kingdom's affairs. Her relationships with other characters are key to understanding her position. She shares a close bond with the powerful Master (player) named Marie Adler. Their friendship began when Marie saved Elizabeth from being harassed by local thugs in Gideon. After spending a day together, they became very close, with Marie assuming a protective, big-sister-like role over Elizabeth, whom she affectionately calls Ellie. Marie has protected Elizabeth on multiple occasions, including during a conflict known as Franklin's Game, and has even intervened against other Masters who approached the princess with ill intent. When Elizabeth needed to journey to the distant Huang He Empire, Marie arranged for a powerful escort to ensure her safety. Additionally, she has a formal relationship with Liliana Grandria, a Paladin and Vice-Commander of the Royal Guard, whom she explicitly asks to protect her, demonstrating her reliance on the kingdom's official protectors as well.

Regarding her development, the narrative provides a specific instance of growth. During her time in Gideon, following an incident where she sneaked out of her lodgings, others perceive a positive change in her. She is observed to carry herself with a new sense of determination, focusing on her duty and appearing more adult than before, hinting at character maturation through her experiences. In terms of abilities, Elizabeth S. Altar is not noted for personal combat prowess. Her notable abilities lie in her social and political status as a princess. Her primary approach to danger is to rely on powerful allies for protection, such as the high-level Master Marie Adler and the skilled Paladin Liliana Grandria. Her influence is derived from her royal position and the loyalty of those who have sworn to protect her or have taken on that role willingly.