Dorothy, also known as Dorothy Ozu, is the elderly and devoted housekeeper to the wealthy detective Rella Shirayuki. She lives with her mistress in a large mansion within the futuristic city of Kirin Town.

In terms of personality, Dorothy is portrayed as a maternal and fiercely protective figure. She acts almost as a nanny or guardian to Rella, looking after her well-being with great care. Despite appearing fragile or elderly, she is much more capable than her initial demeanor might suggest. Dorothy holds a strong dislike for Ranma Hinamatsuri, Rella's detective partner. She views him as lacking class and resents him for leading her beloved mistress into various dangerous situations and adventures.

Dorothy's primary role in the story is providing support to Rella from within the mansion. She is not a field agent but acts as a vital logistical and technological backbone for Rella's detective work. Her main function is to create and supply a variety of high-tech gadgets and weapons designed to protect Rella during her investigations. This equipment is essential, as Rella is often described as a thrill-seeker who enjoys exciting detective work.

Her key relationship is exclusively with Rella, to whom she is unwaveringly loyal. The search results do not provide information regarding her relationships with any other characters in the series besides her negative opinion of Ranma. Similarly, there is no information available about Dorothy's own motivations, any character development she undergoes throughout the series, or the specifics of her background. Her notable abilities include maintaining the large household by herself and her talent for inventing and producing protective gadgets.