Krone

Sister Krone or Krone is a sister/helper in The Promised Neverland and helps run the Grace Field House orphanage with Madam Isabella.

Personality
Like "Mama", Sister Krone is a evil two-faced caretaker of the children.

Intelligence
While being very intelligent, having obtained perfect scores on test during her days as a child, Sister Krone is still inferior to Isabelle and falls short in her attempts to outwit her, so that she may take Isabelles position as "Mama" of the orphanage. Nevertheless, she continues making attempts to obtain an advantage so that she can "drag her down" from her position.

Relationships
Madam Isabella is her superier and asked for her to help keep watch over the children of the orphanage. Sister Krone, at first admired and respected Isabelle, being delighted at the chance to work by her side. These feelings however turned into disdain after Isabelle revealed to Krone that she was just a tool and to do nothing more that what she said. This lead Krone to plot against Isabelle to upsurt her and take her position as Mama.

Trivia

 * Her name "Krone" is the german word for "crown", which fits with her desire to take Isabella's postion as the top of the Mamas.