Are you perhaps thinking of:
* Lord Frieza? He's the main villain in the Frieza Saga and a powerful being with many forms.
* Cooler? He's Frieza's older brother and also a powerful villain.
* Chilled? This character actually appears in the Dragon Ball Super: Broly movie, not in the main series. He's a cruel and ruthless space pirate who encounters Goku and his friends.
Please clarify who you're asking about.