Juliette Renée McDean was born in Brooklyn, New York to Samuel Dean, who was the Law Enforcement Department Head at the American Ministry of Magic at the time, and Emma Cobblesten. The romantic relationship between Emma and Samuel came to an end two years after Juliette was born. It was agreed between the two parents that they would have joint custody of Juliette, but she would live with Samuel in New York until she was old enough to make her own decisions.

Little Juliette was a very active toddler and participated in a lot of activities. She took ballet classes when she was four years old, and that escalated into gymnastics at seven years old. She continued gymnastics until she was twelve years old; she stopped after she fell off the balancing beam one day and broke her ankle. Ever since then, she's been afraid of heights and scared of falling.

When she was eleven years old, Juliette began homeschool. Her teacher was the daughter of one of her father's friends. She had showed interest of attending Illvermorny at the time, but she had friends in the neighborhood that would be attending homeschool, so she decided to stay with them. She learned magic at home until she turned thirteen and her father moved them to London, England due to "work related stuff" and "wanting to be closer to family." He was starting his new job at the Ministry in January 2089, and she was not pleased, but she knew arguing would get her no where.

For Juliette, London was not home, and she was out of school until September arrived. She tried keeping in touch with her homeschool teacher via webcam, but it became increasingly hard as time rolled by. She spent most of her free time reading books and looking for ballet classes around the area, thinking getting back into an activity that was familiar to her would help with settling into her new home.

September arrived quickly, and she found herself on the Hogwarts Express and waving goodbye to her father for the first time ever. She would be spending months away from him. It was new to her, but she was excited (and nervous) about Hogwarts and meeting knew friends.

She began walked through the doors to Hogwarts for the first time in September 2089 and got sorted into Hufflepuff. She has been promoting Badger pride every since.