Úrsúla Sumarliði functions as both personal bodyguard and primary lover to Queen Mercelída Ygvar in the kingdom of Ygvarland. A member of the Varhund race, she exhibits female characteristics alongside male genitalia, a common trait among her people. She possesses the second-largest male genitalia in the series, exceeded only by Naoya Tohara.

Standing 1.81 meters tall and weighing 69 kilograms, Úrsúla boasts a voluptuous figure with measurements of 99-64-93. Her appearance features short brown hair, striking purple eyes, and the distinctive dog-like ears typical of Varhund. She is typically attired in a military dress uniform, beret, boots, gloves, and an armband, and is often armed with a sword.

As Captain of the First Division of Special Duty Kingdom Guards and commander of the royal guard, Úrsúla holds authority over individuals such as Zelda. Her duties demand ensuring Mercelída's constant safety, accompanying the queen outside the castle, and providing coital services when required. She maintains a serious military bearing yet adapts seamlessly to the queen's needs, displaying composure even during crises like coup attempts.

Úrsúla harbors romantic feelings for Mercelída and experiences jealousy when the queen shows interest in other women. She takes pride in her physical attributes but nurses a slight complex about her voluptuousness compared to those with smaller frames. Her loyalty merges professional obligation with personal devotion, compelling her to prioritize the queen's well-being above all else.

Her background establishes a familial connection to Eldór through their shared Varhund heritage. Throughout the series, she remains a steadfast presence in Mercelída's life, consistently fulfilling her dual role as protector and intimate companion without undergoing significant developmental arcs.