Cell

Cell (セル, Seru) is a bio-android created by the Dr. Gero's Supercomputer hidden in the basement of his lab, coming from an alternate timeline. He's known to possess all the abilities of the greatest fighters to have ever inhabited or visited Earth. He is a playable character in Dragon Ball FighterZ, appearing in his Perfect Form.

Background
The ultimate creation of the mad scientist Dr. Gero, Cell is an android capable of gaining power through absorbing people into his being. Upon absorbing Androids 17 and 18, he would gain his "Perfect" form, making him one of the most powerful and dangerous villains in the world who would've destroyed the Earth if not for Gohan, who defeated him as a young boy.