Katherine

Katherine is head of form in the North Tower. She keeps the girls in check but at the same time has their upmost respect. A girl who has grown up before her time, she knows how to have fun but also knows when to stop before things go too far. When the grown-ups aren't around the girls go to Katherine, but her leadership is tested later in the series when she has to get to the bottom of who smashed Mary-Lou's precious pen.