The character known as Brave Priest, often referred to simply as Priest or by his Japanese title Shinpu, serves as a priest in a southern village church that hosts a special magic academy for training. His background is rooted in a dark and violent past as a member of the Church's ruthless Arbiters faction, where his primary duty was hunting and eliminating witches and sorcerers. During this time, he committed numerous coldblooded murders, establishing a history of bloodshed that stands in stark contrast to his current peaceful vocation. A significant physical trait is his extreme photosensitivity, which forces him to wear a black blindfold over his eyes during daylight hours; he removes it only at night to reveal his gray eyes.

In terms of personality, Brave Priest is consistently calm, stoic, and levelheaded, maintaining a composed demeanor that does not betray his violent history. Despite his past as an assassin, he exhibits strong protective instincts, particularly toward Lilly, a timid mouse beastfallen who assists at the church. He regards her with a paternal affection, treating her as a daughter figure. However, he initially struggles with residual hostility toward witches and magic users, an ingrained prejudice stemming from his days in the Church faction. This leads him to behave rudely at times, for which he later apologizes, acknowledging his own bias. His interactions with others, including the mercenary and a character named Holdem, feature moments of comradely bickering over shared hardships, indicating that he has begun to integrate into the community despite his naturally isolated and reserved nature.

Brave Priests primary motivation is a personal journey of redemption, seeking to atone for his past atrocities by using his skills to protect rather than destroy. His role in the story is pivotal during the village's defense against Church forces, where he actively fights against Beastfallen mercenaries to rescue the captured Lilly. He also participates in strategic planning with other protectors, contributing his keen observational abilities to identify threats. His relationships evolve significantly over the course of the narrative. His initial hostility toward witches is gradually transformed through collaboration with magic users like Zero and Loux Krystas while defending the village. His paternal bond with Lilly is a key driver for his actions, and his willingness to work alongside former enemies demonstrates his changing worldview.

The development of Brave Priest is marked by a clear and deliberate shift from a ruthless enforcer of the Church to a reformed guardian of a small community. His prejudice against witches and sorcerers softens as he fights alongside them, and he learns to apologize for his ingrained rude behavior. His integration into the village, complete with friendly bickering and shared burdens, shows that he is finding a new place for himself beyond his former life of isolation and violence. His notable abilities include specialized skills in lie detection and micro-expression analysis, allowing him to discern truthfulness through subtle body language cues. He maintains peak physical condition from his years of training and service, and his past as an assassin informs his strategic combat awareness and his ability to identify threats effectively.