Gieselbert Aldridge is a supporting character who first appears as a seemingly imposing figure but is gradually revealed to be a deeply caring and regretful individual. He is the older brother of Hazelita Aldridge and lives in a grand, luxurious mansion, serving as the head of the household while his parents are away. Physically, Gieselbert is depicted as a young man with blue eyes and short, blue hair that reaches his ears, and he is often dressed in a vest with a bolo tie.

Beneath his composed and occasionally stern exterior, Gieselbert is defined by his intense devotion to those he loves. He is famously doting on his younger sister, Hazelita, to the point of having a sister complex, and he watches over her protectively. This familial love extends to a profound and lingering heartache for a holy woman from his past named Frederica, who was known as the Lady Saint of Compassion. Gieselbert harbors deep and persistent romantic feelings for Frederica, continuing to visit her grave long after her death to offer flowers and honor her memory.

Gieselbert’s primary motivation stems from a past tragedy he could not prevent. He carries the heavy weight of regret over the death of Frederica, who was brought to the city by a wealthy family that worshipped her merely for her holy status rather than treating her as a person. Gieselbert deeply laments his failure to save Frederica from her cruel fate, a failure that continues to shape his actions and worldview. Based on this painful experience, he often offers sincere advice to the young pastor, Lawrence, hoping to guide him away from similar sorrow. In the present, he maintains a connection with the main lady saint, Cecilia, discreetly monitoring her to ensure she is not being mistreated or used solely for her powers. He is also revealed to be the true employer of the character Abel, setting events in motion that bring the main cast into his sphere.

In the story, Gieselbert serves as a critical figure who provides both hospitality and a cautionary tale. He hosts the main characters for a lavish dinner and a stay at his mansion. More importantly, his personal history becomes a central focus of the narrative, as he shares the tragic story of Frederica with Lawrence and Cecilia. He confesses that he was the one who sent a secret report about Frederica’s inhumane treatment to the Great Lady Saint and that he repeatedly tried to persuade Frederica to run away with him, though she always refused because it conflicted with her beliefs as a saint. This revelation adds a layer of pathos to his character, transforming him from a potential antagonist into a sympathetic figure weighed down by guilt and loss.

His key relationships are defined by love and duty. With his sister Hazelita, he is a protective and affectionate older brother. His relationship with the late Frederica is one of unfulfilled love and lasting remorse, which defines his emotional core. With Lawrence, he acts as a mentor of sorts, warning him about the dangers that can befall a saint. He also acts as a concerned overseer to the current Saint Cecilia, ensuring she is treated with the dignity that Frederica was denied. Throughout the series, Gieselbert shows significant development, as his initial mysterious and somewhat menacing demeanor is peeled back to reveal a man still struggling to live with his past. A touching moment from the grave of Frederica, delivered through Cecilia, asks him and Hazelita to move forward, suggesting a path toward healing from his long-held grief. While not possessing supernatural abilities himself, his notable power lies in his substantial wealth and social influence, which he uses to host others and potentially protect those he cares about.