Erma is the Japanese-American daughter of Samuel Williams (human father) and Emiko Yūriemoto (yokai mother). She greatly resembles her mother, having very long hair that often obscures her face, ghostly white skin, and yokai abilities. Erma is described as a young ring girl, but just for sake of saying, is a copy of her mother. She is a half-human, half-yokai niece to the Williams family and Yureimoto family, as well as the oldest cousin to Emily Williams, Mitsu Yūreimoto and Momo Yūreimoto. She is also the owner of the Williams family undead dog "Siris" (named for an Egyptian god of death). Although she knows very little about the prior events that take place in her parent's life, she soon finds out the truth as their "Family Reunion Arc" shows her unknown relatives from Emiko's side, as well as her other species. She was born and is currently living in the town of Blairwood, Illinois (IL), USA. She and her friends' go to Blairwood Elementary. At the start of the story, Erma is a young girl around the age of 8 years(crows) old attending elementary school. Erma is a kind-hearted, intelligent, mischievous young unique child. Erma, like her mother and Father, holds a big heart for family, friends, and other species. She deeply cares and loves her mother and father, finding her mother a great inspiration and teacher in her yokai abilities, and also finding her father a pure and loving human. She enjoys trying to spook people, such as her babysitter, or her father Samuel. She is also innocent, weird, and full of wonder. In terms of human, she shows characteristics of a humanoid appearance, having the traits of human anatomy from her father, mixed with characteristics from her mother's yokai anatomy. In terms of yokai, she is mostly a copy of her mother, sharing the abilities and gifts as a child from a human and yokai, in terms of human, she shares her fathers personality an little curious nature. Erma lives an easy-going life with her friends, family, and other species that she encounters. Erma is very energetic in many of her antics and abilities, wanting to express and explore the very yokai child she is, although these abilities due lead to a lot of destructive day to day activities she does, everyone accepts that because that who she is. Erma despite being very chaotic and destructive like her mother, holds a soft and kind personality, wanting to hang out with friends, have fun with mythic creatures, going to school, and enjoying the company of her crush "Connor".