D4-K2 was a droid with a mission; to serve her master, Freya Kotar. D4-K2 served as an assassin droid for Freya her whole droid life. She was one of the best HK droids made. D4 was very good at her job killing those her master wanted dead. D4 also served as protector of her master's daughter Lara Kotar when she was just a little girl while Freya was away.