Rosalie

A ghost (evil spirit) girl. She died at the age of 15 and has been deceased for about 200 years. She refers to herself as "Atashi." Her hairstyle is a short bob. She was once the daughter of a merchant living in the area where Halkara's pharmaceutical factory was being built in the town of Nascute. Her father told her she could marry into nobility, but in reality, she discovered that her financially troubled parents intended to sell her to a brothel, leading her to hang herself in despair. Since then, she has been driving away outsiders to protect the land where her only connection, her former home, stood as a bound spirit.

Halkara, troubled by the ghost disturbances, consulted Azusa, who, with the help of Beelzebub, captured her. After hearing her story, she expressed a desire not to pass on, and with Azusa's suggestion, she possessed Halkara to move to the house on the highlands. After various attempts, she managed to separate from Halkara and began living with them. By leaving the land she was bound to, she gained the freedom to move around and, with Azusa's assistance, introduced herself to the town of Nascute, resolving the ghost disturbances. Since then, she has become like a younger sister to the family, calling Azusa "Nee-san" and referring to Laika, Halkara, and Flatorte as "Aniki" or "Anego."

She claims that she was once a well-mannered girl known throughout the town, but after being betrayed by her parents, she "went astray," sitting with her legs spread and speaking in a blunt manner. As a ghost, she has a unique perspective and can pass through walls and use poltergeist abilities to move objects, allowing her to participate in household chores. However, since ghosts do not eat, she cannot taste food, so her role in cooking is limited to assisting. Although she couldn't change clothes as a ghost, Azusa created a magic to enhance her image, allowing her to change clothes on special occasions. She also has the ability to see the state of others' souls.

Later, the exact year of her death was discovered, and a grand 200th memorial service was held in the Kingdom of Sarsa Sarsa.