2 Works in Shade's Children - Garth Nix
Ella didn't expect to be leading a Team, let alone one consisting of herself and a giant half-mute from the Training Grounds. But as Drum comes through for her time and time again, Ella lets down her defenses and realizes that a single word can say everything that needs to be said.
Lots of kids in the Dorms develop Change Talents, but only a few are brave enough to make use of them. Ninde has always felt superior to the other children in the Dorm. When her Talent emerges, she swears that she will be one of the ones who makes it out, and she'll find a way to drag her cowardly friend Sola along with her.