Miruru is a demon catgirl with blue hair, green eyes, cat ears, a tail, and distinctive cheek curls. Initially a henchman serving under Dispel alongside agents like Eros and Muse, she actively interferes with Noelle's goal of becoming an angel. Miruru was once Noelle's childhood friend before aligning with Dispel, and is later revealed to be Dispel's daughter.

A pivotal moment occurs during the Durian festival when Dispel attempts to eliminate her, declaring her expendable. Gabriel intervenes to save her life despite suffering severe cat allergies that previously caused him to reject her. This rescue marks a turning point. Following Dispel's destruction by Silky, Miruru is freed from her obligations and joins Noelle's household, dedicating herself as the family maid.

Her character development centers on her persistent romantic pursuit of Gabriel. His initial hostility, fueled by allergies, lessens as he becomes accustomed to her presence. While her role shifts from antagonist to ally, her "selfish attitude" remains consistent. Created as one of Silky's living toys brought to life through Silky's power, her personality blends apparent harmlessness and ditziness with underlying menace, particularly evident during her antagonistic phase.