Mariah comes off as a calm, cool-headed person. However, she easily loses her cool whenever things don't go according to plan. She contorts her face and bites her lip comically when she is upset or uncomfortable. She also has a very distinctive laugh, which she does when she has her opponents helplessly trapped in the magnetic power of her Stand. Mariah also seems to demonstrate an attraction towards older men, as she mentions that Joseph is very sexy and that she would have been his lover if it were not for Dio Brando being more attractive.