Liscia Elfrieden, Princess of the Elfrieden Kingdom and daughter of former King Albert Elfrieden, graduated from a military academy and held an officer rank. Before her father's abdication, she frequently undertook diplomatic missions to regional armies. Her initial betrothal to Kazuya Souma, who ascends the throne, causes confusion, yet she gradually develops romantic feelings for him and emerges as a steadfast supporter of his reforms tackling economic recession, food shortages, and war tributes. She provides input during political decisions and travels.

A fair-skinned young woman with platinum-blonde hair and eyes, Liscia initially wore her hair in a ponytail secured by a black ribbon. As a declaration of loyalty to Souma before the Three Dukes Council preceding the One Week War, she cuts her ponytail short, abandoning the ribbon. Her hair later grows past her shoulders, worn loose. She is frequently seen in a red military uniform highlighting her slim physique.

Her personality blends pride, strong will, open-mindedness, and common sense. She prioritizes the well-being of her family and subjects, demonstrating loyalty to Souma even against potential opposition from her father. She exhibits practicality in governance, questioning expenditures like dining hall meals. While accepting Souma's subsequent engagements to Aisha Udgard, Roroa Amidonia, Juna Doma, and Naden Delal, she insists on remaining the first primary queen. She initiates their physical relationship after interference from the Orthodox Papal State and negotiates bearing Souma’s first heir before his other relationships progress, with all queens agreeing to co-mother all children.

Key developments include her falling ill after returning from the Star Dragon Mountain Range, later revealed as pregnancy with twins. She stays with her parents until after the birth, then resumes duties while adjusting to limitations on travel and combat training. She marries Souma during his coronation, becoming First Primary Queen of the newly formed Kingdom of Friedonia. The twins, Cian and Kazuha, are publicly introduced afterward. Liscia experiences distress when they refer to all queens as "Ma" and learn Carla Vargas’s name before hers.

Militarily, she possesses formal combat training and swordsmanship proficiency. She demonstrates tactical acumen in battle, notably during the conflict outside Van. Her magical ability focuses on water-element ice manipulation, augmenting weapons or executing area attacks like "Ice Sword Mountain," conjuring ice spears over a wide range. She engages in experimental combat exercises, such as a magic duel against Aisha during Morse Butchy’s research.

In her current role, she resides in Parnam, manages state affairs during Souma’s absences, and cares for the twins.