Gil is a young woman with long blond hair and blue eyes, typically seen wearing sister attire. A devout nun, her faith in God is more sincere than anyone else's, driving her to pray continuously. Her personality blends kindness with a self-righteous sense of justice, often prioritizing others over herself to the point of risking her own life. She firmly believes God will punish those who harm the defenseless. However, her rigid moral framework causes conflict; she condemns Prontea for killing a demon swiftly to save her, arguing that ending a life "one-sidedly" is unbearable, even with the same outcome. This highlights her ungratefulness toward the Idaten when their actions contradict her idealized morals, despite them saving her. Her commitment to justice is undercut by a lack of practical power or skills beyond prayer, leading to her realization she is merely a "good person" incapable of effecting real change, a powerlessness emphasized by Piscalat.

During the Zoble Empire invasion, Gil endures multiple abuses, including gang rape by soldiers. These traumatic experiences erode her faith and amplify her feelings of incapacity. Her breakdown culminates in desperate cries amid the empire's collapse, which—combined with the surrounding tragedy—triggers the manifestation of a new Idaten. This entity embodies her deepest desire: an alter ego born from her wish for the power to protect the weak. After this Idaten separates from her, Gil emerges calmer and more understanding of the complexities of morality and survival.

Despite her suffering, she retains her core compassion. Even after witnessing the brutality of the Zoble Empire's leaders, she attempts to aid the mortally wounded Emperor Takeshita, adhering to her belief in offering help regardless of alignment, reinforcing her role as an unwavering, albeit traumatized, figure of empathy.