Koby was first introduced as the Alvida Pirates' hapless ship caretaker who lived in fear of both the ship's crew and captain. Two years of forced servitude had robbed her of all hope of escaping as well as her dream of becoming a Marine, leaving her with few goals. Under Garp's instruction, Koby's timidity has been replaced with confidence, although she remains polite, self-effacing, and apologetic if he feels she has done something overly ambitious.