Milly

Milly (ミリー, Mirī) is one of the minor character of The Promised Neverland. She is a one-year-old orphan who formerly resided at Grace Field House Plant 3 as one of the many foster children of Isabella. She only appears in the manga. Due to her age, Milly is considered to be one of the house's "low-quality goods".

Milly now resides at a different plantation at Grace Field House under the parental care of Yukko along with Sherry, Eugene, Carol, Phil, and Charlie after Grace Field House Plant 3 was burnt down.

History
Milly was born at Grace Field in 2044 and sent to Plantation 3 a year later in 2045, growing up along with several other children under the parental care of Isabella. She sleeps in Isabella's room and was left behind with the younger children at Grace Field House, while the children over five years old made their escape. She is first shown in chapter 100. Along with Phil and other younger orphans like Carol, Eugene, Charlie, and Sherry, Milly now resides in at a different plantation at Grace Field under the care of Yukko after the Grace Field House Plant 3 was burnt down.

Appearance
Milly has short white hair and slanted eyes. Like all the other children at the orphanage, she wears a plain white onesie with a plain white bib and brown boots. Her identification number is tattooed on the left side of her neck.

Personality
Not much of her personality is shown, but she appears to be an innocent, happy, and typical one-year-old who loves her family and enjoys playing with her siblings.

Introduction Arc
Taking daily tests, playing a game of tag and hide-and-seek, eating scrumptious homemade food and having a good time – Milly went through the same routine every day at Grace Field House.

Jailbreak Arc
On the night when the House burnt down, Milly was seen expressing concern regarding the absence of her fifteen older siblings. After Isabella failed to retrieve the older children, Mike was seen sleeping with her other siblings who were left behind, being cared for by Isabella. Emma promises that she will come back within two years to rescue her siblings from Grace Field.

Cuvitidala Arc
Two months after the escape and Grace Field House Plant 3 burnt down, it is revealed that Milly was transferred to one of the other plantations at Grace Field. She now resides on a new plantation along with some of her other siblings.

Return to Grace Field Arc
After getting the word that all the farms are to be abolished, Emma returns to Grace Field House to get Milly and the others.

Emma, Norman and Ray
Emma and Norman have a deep regard for Milly, as she is a part of their "family". Upon learning that all of her sibling that had been shipped out were dead, Emma and Norman vow to escape with all of their younger siblings, despite most of them being under the age of five. Ray, however, is more skeptical of their plan and considers everyone other than Don and Gilda to be burdens to their escape plan.

Despite this, Ray really does care about his younger siblings, but believing that escaping with everyone was impossible, he had emotionally detached from them over the years and tried to avoid becoming too close to them so that he would not be as sad when they were inevitably killed. After Norman successfully came up with a plan to escape without sacrificing anyone, Ray admitted defeat and finally joined Emma in vowing to not leave anyone behind. They ultimately decided to escape with all of their siblings over the age of five and return to rescue their younger siblings within two years, before they were old enough to be shipped out.

Isabella and Yukko
Milly did not know the real intentions of her caretaker, Isabella, and loved her very much as she were her real mother. After fifteen of her older siblings escaped from Grace Field, Milly was sent to a different plantation at Grace Field with a new mother, Yukko. Still not knowing the truth of the orphanage, it is assumed Milly loved her new caretaker just as much as Isabella.

Jackie, Simon and Helen
After being relocated to a different plantation at Grace Field after the fire and destruction of Plant 3, Milly was seen happily playing with the children at her new home, mainly Jackie, Simon and Helen. Milly loved her new siblings, was kind to them and got along well with them. In return, they welcomed her into their family without a second thought.

Phil, Eugene, Sherry, Charlie and Carol
Milly is close to Phil, Eugene, Sherry, Charlie and Carol as they are part of her family. She was often seen playing with them and cared deeply about them. After Plant 3 burned down, Milly and Phil, Eugene, Sherry, Charlie and Carol were relocated to the same plantation at Grace Field where they continued to be close.

Grace Field Escapees
Milly and her older siblings loved each other very much. After fifteen of her older siblings escaped from Grace Field and Plant 3 burned down, Milly was seen expressing concern of their whereabouts. Milly did not know the truth of the orphanage nor did she know that her older siblings had actually escaped, and after being relocated to a different plantation at Grace Field, she was told that her fifteen older siblings had been sent to live with foster families. Despite leaving her behind, the Grace Field Escapees vowed to return within two years to rescue Milly and their other younger siblings before they could be shipped out.