Firumina, also known by the romanized name Firumina, is a character from the anime Reborn as a Vending Machine, I Now Wander the Dungeon. Her name appears in English records as Filmina. She holds the position of vice-president or vice-chief of a group known as the Menagerie of Fools. In this role, her primary responsibility is to support and manage the group's leader, Kerioyl, who is described as having an eccentric, free-spirited, and unpredictable nature. She acts as a grounding force, handling his antics and ensuring that the team remains organized.

In terms of personality, Firumina is characterized by a notably strong and decisive attitude, particularly when the subject of money arises. She is described as extremely money-conscious or greedy for wealth, a trait that stems partly from the Menagerie of Fools' precarious financial situation. Her assertive stance on financial matters is such that even her husband and leader, Kerioyl, is said to be overwhelmed or embarrassed by her determination. Despite her commanding presence within the group, she possesses a notable aversion to horror or terrifying things. This fear is significant enough to cause her to refrain from accompanying her comrades to certain dangerous locations, such as the stratum known as the Lamentation of the Dead.

Her motivations and role in the story are closely tied to her dual responsibilities as the group's vice-chief and as a member of a family. She is driven to maintain order within the Menagerie of Fools and manage its finances. Beyond her professional role in the adventuring party, she is revealed to have a private family life; Kerioyl is not only her superior but also her husband, and the group members known as Aka and Shiro are their sons. This context presents her as a figure balancing her rigorous duties as a leader with a caring, maternal side. Within the narrative, she participates in expeditions, such as the fight against the King Frog Fiend, where her skills are utilized.

Regarding her abilities, Firmina is an expert in long-distance combat, specializing in water magic. She casts these attacks using a wand, executing them with high precision and forming a key part of her team's offensive strategy. Her development is shown through the revelation of her family ties to the group's leader and other members, transitioning her from a simple supporting character into a figure with deeper personal connections to the core team. Notably, one of her key relationships is with the protagonist, Boxxo; she is among the characters who attempt to analyze him, noting on one occasion that she could sense no magical aura emanating from him.