Marge is a vampire lord and a supporting character in Dark Moon: The Blood Altar. She served as the principal of Vamfield House, the orphanage where Heli and his six brothers spent their childhood under her close supervision. In earlier times, she was the personal tutor of Princess Selen, the ancient ruler who would later reincarnate as Sooha. After Selen's death, Marge carried out the princess's final request: to send the seven vampire lords into the future and watch over them until the day their memories and purpose would be restored.

Marge's personality is defined by her quiet authority and unwavering sense of duty. She maintains tight surveillance over the boys at Vamfield House, ensuring they remain hidden and protected from the outside world. Her demeanor is stern yet caring, reflecting a guardian who takes her responsibility seriously, even though the boys do not understand why they are being sheltered. Her primary motivation is loyalty to Princess Selen and a deep commitment to safeguarding the seven knights until the destined reunion.

In the main story, Marge's role is that of a keeper of secrets. She is one of the few characters who knows the truth about the boys' past lives and their connection to Selen. She waits patiently at the orphanage, preserving their fates and preparing for the moment when Sooha would appear. Her key relationships are with the seven brothers—especially Heli, whom she tutored—and with Selen, whose trust she earned. Marge's development is subtle; she remains a steady, behind-the-scenes presence who facilitates the larger narrative without stepping into the spotlight.

As a vampire lord, Marge possesses supernatural abilities typical of her kind, though her specific powers are not widely detailed. Her greatest strengths are her longevity, knowledge, and the protective influence she exerts over the boys' early lives. She appears in the prequel series Children of Vamfield, which explores her time as the caretaker of the orphanage.