Prêtresse, often referred to simply as Priestess, is a central character in the Goblin Slayer narrative. She is a young human woman who begins her journey as a freshly ordained priestess of the Earth Mother, a deity associated with life, protection, and mercy. Her background is that of a novice from a rural temple, possessing little practical adventuring experience at the start of the story. She is driven by a sincere desire to help others and to serve her goddess, which leads her to register with the Adventurers' Guild in the frontier town where the main action takes place.

Personality-wise, Priestess is initially defined by her innocence, kindness, and a strong moral compass rooted in her faith. She is compassionate to a fault, often showing concern for the suffering of others, including those whom society might deem unworthy of sympathy. This empathy is coupled with a notable naivety about the harsh realities of the world, particularly regarding the brutal nature of goblins. As the narrative progresses, she retains her fundamental gentleness but develops a significant degree of resilience and pragmatism. She becomes more assertive, learning to make difficult decisions in life-or-death situations, though she frequently grapples with the ethical dilemmas posed by her peaceful doctrine when confronted with the necessity of lethal force. Her inner conflict between her religious tenets of protection and the violent demands of her adventuring life is a recurring aspect of her character.

Her primary motivation is to protect the innocent and to prevent the tragedies that goblins inflict upon villages and individuals. This mission is deeply personal after her traumatic first adventure, where her original party was slaughtered by goblins, and she was saved by the Goblin Slayer. This event shifts her purpose from abstract service to a concrete, determined focus on eradicating the goblin threat, albeit through a lens that often seeks to minimize casualties and protect survivors. She is also motivated by a growing sense of loyalty and responsibility toward her new companions, particularly the Goblin Slayer, whom she feels compelled to support and, in a way, to humanize.

In the overarching story, Priestess serves as both a foil and a moral anchor to the Goblin Slayer. While he is single-mindedly focused on killing goblins with cold efficiency, she represents the hope for a better outcome, often suggesting alternatives like rescue, surrender, or non-lethal methods. Her role evolves from that of a helpless novice to a capable supporter and tactical partner. She is frequently the party's healer and defensive linchpin, using her divine miracles to shield allies, create barriers, and provide light in darkness. Her presence often forces the Goblin Slayer to consider the aftermath of his missions, such as the fate of captives, which he would otherwise ignore. She is also the character through which the audience often witnesses the psychological toll of adventuring, as she processes trauma and fear while still choosing to move forward.

Her key relationships are central to her development. Her bond with the Goblin Slayer is the most significant; she views him with a mixture of gratitude, awe, and profound concern. She acts as a bridge between him and the rest of the world, often interpreting his blunt statements to others and advocating for his well-being. She develops a close friendship with the High Elf Archer, Dwarf Shaman, and Lizard Priest, forming a cohesive party that relies on mutual trust. With High Elf Archer, she shares a camaraderie that balances her more serious nature with lighter moments. Her relationship with the Guild Girl is also notable, as both are women who care for the Goblin Slayer and often exchange worried observations about his lifestyle.

Her character development is a gradual arc from inexperience to competence. She begins by following orders and relying on her miracles without a deep understanding of combat strategy. Through repeated expeditions, she learns to anticipate goblin tactics, to use her spells with precise timing, and to remain calm under pressure. A pivotal moment in her growth is when she begins to take independent action, such as using her protective miracles offensively to trap or disorient enemies, moving beyond the purely defensive role she initially occupied. She also matures emotionally, confronting her nightmares and fears about goblins, and transforming that fear into a measured courage. She does not lose her kindness, but she learns that mercy sometimes requires strength and that protection can demand violence.

Her notable abilities stem from her clerical class. She can perform miracles bestowed by the Earth Mother, which are limited in number per day. Her most frequently used spells include a small miracle that creates a soft light, a barrier that can block physical attacks or seal an area, and a spell that purifies water or other substances. She also possesses a powerful miracle that can temporarily stun or render unconscious a single living being, a non-lethal tool she uses strategically. Later in the story, she gains the ability to use a more potent protective miracle that can create a larger, more durable wall of divine energy. Beyond her magic, she develops practical skills such as navigating underground environments, using a sling and stones for ranged distraction, and carrying a small mace for self-defense, though her physical combat prowess remains limited compared to her martial companions. Her true value lies in her tactical support, her healing, and her unyielding moral clarity, which often provides the party with the resolve to complete their grim missions.