Adrik Zhabin is the younger brother of Nadia. Like his sister, he is Grisha and a Squaller.
Shadow and Bone
Adrik is among the children studying at the Little Palace's school for young Grisha.
Siege and Storm
When Alina Starkov evacuates the Grisha children from Os Alta, Adrik insists on staying, claiming that he's old enough to fight. Nadia agrees, saying that she doesn't want to be parted from her brother. Alina replies that it would be even more difficult to bury him, though she eventually agrees.
Adrik is among the Grisha present when the Darkling attacks the Little Palace, and one of the few to survive the battle. He follows Alina and the others to the White Cathedral.