He is perhaps the most evil, bloodthirsty, and powerful villain in the universe—so powerful that religious sects have worshipped him as a god. His enemies include nearly every Super Hero in existence. He is obsessed with Goddess Death and has waged genocidal campaigns in an attempt to placate her. Most famously, he has attempted to conquer the universe by wielding the Infinity Gauntlet. He is the Mad Titan.
He is Thanos.
As both god and ruler of the Endless Resurgence empire, Thanos controlled his people through a combination of force and fear, viewing freedom as disorder, as a hole in the universe that allows for in randomness and chaos. He saw death as an end to uncertainty, and so, he loved it. Thanos viewed his reign as the natural order of thing. To him, fate and chance are always at war, and his rule demonstrates the preeminence of fate. To help him with his domination, he once possessed a powerful cube that erased the will of his people. Unfortunately for him, he lost it under mysterious circumstances millennia ago, and has since been attempting to get it back.
Unsurprisingly, many civilizations did not enjoy or want Thanos' brutal leadership. Thanos dealt with such uprising brutally, have his soldiers, the Ravens and the Bombardiers, and his sons, such as Gallowglass and Ronan the Accuser, quell any dissidence. For example, after the planet Pyx rose up against his rule, Thanos ordered Ronan to kill all males there over the age of 10.
From his birth on Saturn's moon of Titan, Thanos was always an outsider. He carries a Deviants gene, which causes his gruesome and misshapen appearance, with purple, rugged skin. He was born among the last sons of Titan's original colonists: Mentor and Sui-San. His mother, shocked to see such an ugly baby, and sensing his potential for evil, tried to kill Thanos at birth, although she was stopped by his father, A'Lars, AKA Mentor. Thanos later killed her for this attempt. Thanos also has a brother, Starfox (AKA Eros), who he was always jealous of, as Starfox was handsome and popular.
Still, Thanos is an Eternal, a type of super human who, according to the Celestials, was meant to be a protector of Earth. And, with a twisted mind, he took his cosmic duty to heart.