Koyuki is the sixth/final baby on Babysitting Mama, and as such, she is considered to be both the hardest out of all the babies, and hardest female baby to take care of. She can be unlocked by completing William's book.Just like the other babies she has not made many appearances outside the game other then few cameos.
Koyuki is an Asian baby that loves the colors purple and white. She seems to have an affinity towards hearts, also. Despite her seemingly quiet and shy nature, she is known for making quite a scary face when there are other babies fussy.
Koyuki is an Asian baby with very pale skin, black eyes and dark purple-black hair that is short and lines her head, worn with a yellow and pink heart shaped hair clip. Her eyebrows are the same color as her eyes.
She wears a white shirt with pale purple lining, neck, and skirt.