Y/N was Keith’s older sister, about 21 years old. She was fiercely loyal, protective, and loving to her brother. She provided as much as she could for him even when it meant getting hurt. She disappeared when Keith was 13 and everyone assumed she’d run away, abandoned him. Keith never believed it, not for a second. He insisted something must have happened to her. Everyone else just thought he was in denial. But he was right. Y/N had been taken from earth by the galra and turned into an experiment.