Yukko

Yukko is a minor character of The Promised Neverland. She is a Mama and caretaker who runs one of the Premium Farms. She becomes Phil's caretaker after Grace Field House burnt down. Like all the other Mamas, Yukko was highly trained to become one. In her Mama persona, Yukko puts on a motherly, loving, affectionate and kind-hearted facade whenever she is around the orphans. Hence, her foster children love her deeply. However, it is implied that like Isabella, Yukko shows much detachment to the children's tragic fate, as she shipped Simon off with a smile on her face. Additionally, after suspecting Phil of knowing the truth, she decided to investigate him by calling Andrew, showing that she is unhesitant in taking down those who stand in her way.