Elina Vance is the third daughter of Count Vance, the most powerful political figure on the continent, and serves as his most loyal servant. As a member of the noble Vance family, which once ruled the continent before the establishment of the Queen's Blade tournament, she holds a significant social status. Her background is steeped in rigorous training from childhood, excelling not only in martial arts but also in espionage techniques. Beyond her role as the Count's bodyguard, she is responsible for gathering intelligence and receives special assassination missions, making her a warrior to be feared.

In terms of personality, Elina is a complex figure defined by duality. She often presents a smiling, angelic facade, but this masks a cruel, mean-spirited, and sadistic nature. Unlike her gentler older sister Leina, Elina does not hesitate to mock her opponents, use curses to break their concentration, or employ psychological warfare to gain an advantage in battle. She holds a deeply demeaning and contemptuous view of anyone outside the Vance family, including commoners, workers, and servants. Central to her personality is a deep, abnormal, and obsessive adoration for her older sister, Leina, which borders on an erotic fixation and possessive love. This obsession is a primary driving force behind her actions.

Elina's primary motivation is to capture her runaway older sister, Leina, who fled from home and is the direct successor to the family. Acting under her father's orders, she enters the Queen's Blade tournament specifically to find Leina and bring her back. Her desire is not merely to fulfill a mission; it is a personal and consuming need to possess her sister, as she believes that only she is allowed to touch Leina. Following the fall of Count Vance, her motivations shift somewhat as she becomes a close associate and enforcer for her half-sister Claudette, the new Queen.

In the story, Elina serves as a prominent competitor in the Queen's Blade tournament and a major antagonist, particularly to Leina. She is a recurring obstacle for her sister, representing the oppressive will of their noble family. As the story progresses into Queen's Blade: Rebellion, her role evolves. After Count Vance's ruin, she pledges allegiance to Queen Claudette and becomes the leader of the Assassins of the Fang, the Queen's personal assassination unit. In this capacity, she is known as one of the cruelest leaders of the death squad, and those under her command fear angering her more than defying the Queen herself. Interestingly, during this period, she no longer seems inclined to search for the missing Leina, puzzling those who knew the extent of her previous obsession.

Her key relationships are almost entirely defined by her family. She is the younger sister of Leina Vance, towards whom she feels an obsessive and abnormal love. She is also the younger half-sister of Claudette Vance, the eldest daughter. While Claudette holds Elina dear, Elina is often described as being slightly cold and distant towards her. Her relationship with her father, Count Vance, is one of duty; she acts as his most loyal tool and assassin. In later storylines, such as in Queen's Blade Unlimited, an unexpected bond forms with a character named Michel Rivaranciel, hinting at new relational dynamics.

Elina undergoes notable development throughout the series. Initially, she is solely defined as the obsessive hunter of Leina, driven by a mix of duty and personal desire. Her entire identity is built around capturing her sister. However, in Rebellion, a shift occurs. Although her abnormal feelings for Leina persist, she no longer actively pursues her, instead dedicating herself to serving Claudette and leading the Assassins of the Fang. This change suggests a maturation or a redirection of her obsessive nature towards a new purpose, enforcing her sister's tyrannical rule. Her combat style also evolves, with her Rebellion guise featuring black feline-themed armor that reflects her ascendant status and intensified ruthlessness.

Regarding her notable abilities, Elina is a highly skilled and versatile fighter. She was trained in the use of spear and body skills, making her proficient at various ranges. At close range, she attacks with strong iron claws capable of cutting through many substances. At long range, she uses a wire to try to bind her opponents, restricting their movement. Her skill set is not purely physical; she augments her combat with psychological tactics. She knows curses that she uses to break an opponent's concentration and uses taunts and demoralizing words to lower their guard, creating an early advantage in battle. A white tiger named Timorf, a legacy of her family, also serves as her protector and emblem of her lineage. Her combat style prioritizes agility and technical precision, allowing her to exploit blinding speed against her foes.