Aojiru is a familiar who serves the hero Jeanne, appearing as a supporting character within the narrative of the anime. As a familiar, Aojiru's primary role is to accompany and assist a hero, and in this case, that hero is Jeanne. The relationship is close and defined by a deep sense of care and concern, as Aojiru is frequently seen worrying about Jeanne's tendency to overwork herself. This concern is a central aspect of Aojiru's personality, portraying the familiar as attentive, nurturing, and emotionally invested in Jeanne's well-being. When Jeanne finally allows herself to rest and take it easy, Aojiru is described as being very happy, highlighting a personality that finds satisfaction and joy in the hero's peace and recovery.

Aojiru's motivation is intrinsically linked to Jeanne's state of being, driven by a desire to see the hero not only succeed in her duties but also avoid burnout and find moments of calm. The familiar acts as a quiet emotional support, and the narrative implies that both Jeanne and Aojiru share in the trials they face together. This is evidenced by the fact that after a series of intense conflicts and efforts involving other heroes and partners, both Jeanne and Aojiru are able to finally earn a much-needed rest, which is celebrated as a shared reward. This shared conclusion to a story arc underscores their unity and Aojiru's integral role in Jeanne's journey, not as a fighter on the front lines but as a companion whose own need for rest parallels the hero's. While specific details about Aojiru's origin, species, or notable abilities are not provided, the role as a familiar suggests an inherent connection to the hero's power or mission, functioning as a supportive presence within the chaotic and combative world they inhabit. The character's development is subtly shown through the growing sense of earned peace, moving from a state of worry to a state of shared relief and happiness alongside Jeanne.