She is the tenth spirit to appear in the series. Mukuro speaks in an overly archaic style. She often speaks in a third person perspective by referring to herself as "Muku" (むく).
After having her emotions unlocked, Mukuro regained her true personality, which in contrast to her sealed one, is very emotional. Due to growing up as an orphan, Mukuro fears to be alone again and desperately wants to remain attached to those who she believes loves her. Even after going as far as to seal the other Spirits' memories of him, Shidou describes her intentions as being motivated by pure love and innocence rather than any true ill will.
Mukuro once was a lonely child that grew up with no family. In her solitude, she concluded that people blessed with a family were special, and she could not be considered special. However, one day, she was adopted by a couple who wanted a child. They, along with an older sister, would soon become a family to her. For a while, she lived in bliss under the warmth of a family. Her sister would complement her hair while styling it, and they often went stargazing together, as she recited the lore of each constellation to her. However, one day while visiting Tenguu Tower, her sister brought along a friend, who commented that Mukuro needed to cut her hair. Hurt by how her sister had changed from always praising her golden hair, she concluded that her sister had loved her friend more than her.
