Freeza

Freeza is one of the principal villains of the series. He is extremely powerful, and goes through several transformations before reaching his final form. He is the one responsible for the destruction of Vejiitasei, and partially for shaping the personality of Vegeta. He is hated by many who serve him, for his cruelty and selfishness have made him the worst sort of tyrant. He is the cause of the destruction of Namek, as well as the deaths of Vegeta, Dende, and Krillin. He is defeated by Goku in Super Saiyan form on Namek, only to have his body found by King Cold, his father, in space. King Cold repairs Freeza's body with biomechanical parts, and they set off for Earth to exact their revenge. However, Mirai Trunks is there and finishes the two of them off with ease, thereby ending the Freeza threat forever.