Elizabeth, also known by the nickname Lizzy, is a character introduced as a disciple of the Qwaser Shin'ichiro Otori. She is an orphan who was taken in by her master, who recognized her innate talent as a Qwaser, and she maintains a strong teacher-student relationship with him, viewing him as a mentor rather than a father figure. Her background as an orphan and her engagement in traditionally boyish activities like swordplay help her quickly bond with Mafuyu Oribe when she arrives at Saint Mihailov Academy, where she becomes Mafuyu's roommate.

In terms of personality, Elizabeth is known for being cheerful, carefree, and innocently mischievous, with a wild and exuberant nature. She has a tomboyish attitude, reflected in her use of the first-person pronoun boku. Her energetic and unworried demeanor can sometimes irritate others, such as her fellow Qwaser Ekaterina Kurae, who often treats her like a pet. Despite her youthful and petite appearance, she possesses a formidable fighting spirit. She has distinctive quirks, including a famous weakness to carbonated drinks, which make her act tipsy, and a deep love for beef stew, which puts her in a lighthearted food rivalry with Alexander Nikolaevich Hell, who prefers borscht.

Elizabeth's primary motivation is tied to her loyalty to her master, Shin'ichiro Otori, and she is driven to prove her strength and fulfill her duties as his disciple. She is eager to train and fight, a dedication that attracts the attention of other powerful figures like Fool. She engages in a duel with Sasha to buy time for her master's plans, demonstrating her commitment to his cause. After Otori's death, she is guided by Teresa Beria to join the Athos organization, seeking to remain faithful to his ideals. Later, she confronts a resurrected version of her master but ultimately rejects his new path, choosing to return to the academy and claim her own freedom.

Elizabeth is the Qwaser of Titanium, granting her the ability to manipulate this element to devastating effect. Her signature ability involves wielding a massive greatsword she calls Excalibur. She can transform this blade into a high-frequency weapon through molecular vibrations, allowing her to cut through almost any substance with terrifying precision. While immensely powerful, her titanium sword can become brittle after sustaining multiple hits, occasionally requiring her to combine her power with other Qwasers to create stronger titanium alloys. This ability and her exceptional swordsmanship make her a feared combatant on the battlefield.