The Sisters (whose real names are Karasu and Washi) are these spectral twins are both the Moon King’s daughters and his most powerful and ruthless assassins. They are the sisters of Kubo's mom but have never treated family above themselves, only when obeying their father. Identical in voice and appearance down to their chilling Noh masks painted with a frozen smile, the Sisters are in charge of dispelling their father’s worries and hunting down his enemies. They do not need to eat, nor to sleep.