Reimu is defined as unusually easygoing, lacking any sense of danger, and being carefree. She is described as simpleminded, always showing her true feelings and acting on whatever ideas she thinks at the top of her head. However, ZUN has also said that nobody except her can know what is in her head, and thus how she is depicted varies depending on the perspective, be it human, fairy, or youkai. She can also be emotional and noisy, and her presence is well known wherever she is, but she can also merge into her surroundings quite easily when necessary.