Kee is a young girl who was born in Dauntless. She is approximately eight years old, and has a green streak in her hair. She was not Divergent, so she was under simulation both times.
Along with Marlene and Hector, Kee was controlled by Jeanine's simulation attack in Dauntless headquarters, meant to intimidate Tris into turning herself in to Erudite headquarters. When Marlene, Hector, and Kee stepped off the ledge, Christina saved Kee and laid her on her back before helping Tris save Hector. The next morning, Kee's name is revealed when Lauren reports what happened to the others. Kee had been sleeping in the initiate dormitories where the cameras had not been deactivated, and this is how Jeanine figured out who the simulation was controlling.