Priestess is the main female protagonist of Goblin Slayer and the first member of Goblin Slayer's adventuring party. She is a fifteen-year-old human girl who serves as a priestess of the Earth Mother, appearing as a gentle young woman with very long blonde hair and blue eyes. At the start of her story, she is a newly registered adventurer at the lowest Porcelain rank. She joins three other inexperienced adventurers for her first contract, an attempt to clear out a goblin nest, and the mission nearly becomes a total party kill. She is saved from that desperate situation by Goblin Slayer, and afterward she becomes his companion and follows him on his subsequent quests.

Her personality is defined by kindness, compassion, and a strong sense of devotion to both her faith and the people around her. She is naturally gentle and helpful, though she is often perceived as frail and delicate in appearance. Early on, she is timid and prone to tears, especially when faced with cruelty or when Goblin Slayer behaves in a blunt and callous manner. Despite these moments of vulnerability, she is determined and refuses to turn away from danger. Her motivation stems from her desire to help others, particularly the helpless, and to honor her faith in the Earth Mother. She also chooses to continue fighting alongside Goblin Slayer out of gratitude and a growing sense of responsibility, even after experiencing a traumatic first encounter with goblins.

Within the party, Priestess serves as a support and defensive specialist. She wields miracles granted by the Earth Mother, and she is noted to possess more miracles than most people her age. Working with Goblin Slayer pushes her to use these powers in unconventional ways, allowing her to protect herself and her allies more effectively in combat. Over time, she learns new miracles, gains practical survival skills, and adapts to the harsh realities of adventuring under his tutelage. Her growth is reflected in her rising status among adventurers; after helping defeat an ogre, she is promoted to Obsidian rank, a significant advance from her starting position.

Her relationship with Goblin Slayer is the central bond of her character arc. She is deeply influenced by his pragmatism and methods, and in turn she becomes one of the few people who draws him out of his solitary nature. Their companionship is built on mutual trust and shared battles, and it develops into a close understanding with undertones of ambiguous affection. Beyond that partnership, she grows into a reliable ally to the wider adventuring group, earning respect by combining her faith, courage, and ingenuity rather than relying on raw strength. Her development from a frightened novice into a resourceful and dependable adventurer is marked by her increasing ability to endure hardship while keeping her compassionate nature intact.