Melluar is an antagonist who appears in the anime Summoned to Another World for a Second Time. Her birthplace is the world of Eclair. When she is first introduced, she is not known by her real name. Instead, she initially presents herself as a villager named Amelle from a settlement called Zathrow.

In this disguise, Amelle claims to be worried about her brother who disappeared after a dragon appeared near the village. She accompanies a skilled warrior named Alizee, who has been hired to slay the dragon. Throughout their journey, she maintains the facade of a helpless and concerned villager. However, the protagonist Setsu eventually deduces from clues in her conversation that she is the real culprit behind the village's disappearances. When confronted, she reveals her true nature as a powerful dragon in human form and is seemingly slain by Setsu and Alizee.

It is later revealed that she survived this encounter. Her true identity is Melluar, a figure known as the Master of Monsters. She possesses the ability to kidnap people and transform them into powerful doll soldiers. These soldiers serve in the army of Toma, the primary antagonist who seeks to become a god and destroy all other life. As a monster tamer, her power extends to turning both demons and humans into these dolls, which she can then control. Furthermore, she is able to unify herself with a doll, suggesting a deeper level of integration with her creations. Her actions are directly tied to the main conflict, as she works to bolster Toma's forces for the ongoing war in Eclair. Her key relationship is with Toma, serving as a subordinate who supplies his army with enchanted soldiers. Through her deception and subsequent exposure, she demonstrates a cunning and manipulative personality, willing to hide her immense power to achieve her master's goals.