Thanos

Thanos is a fictional supervillain appearing in American comic books published by Marvel Comics. He was created by writer-artist Jim Starlin and made his first appearance in The Invincible Iron Man #55 (Feb. 1973). An alien warlord from the moon Titan, Thanos is regarded as one of the most powerful beings in the Marvel Universe. He has clashed with many heroes including the Avengers, the Guardians of the Galaxy, the Fantastic Four and the X-Men.

Fictional character biography
Thanos was born on Saturn's moon Titan as the son of Eternals A'lars and Sui-San; his brother is Eros of Titan. Thanos carries the Deviants gene, and as such, shares the physical appearance of the Eternals' cousin race. Shocked by his appearance and the belief that he would destroy all life in the universe, Sui-San attempted to kill him, but she was stopped by A'lars. During his school years, Thanos was a pacifist and would only play with his brother Eros and pets. By adolescence, Thanos had become fascinated with nihilism and entropy, worshipping and eventually falling in love with the physical embodiment of Mistress Death.