Percy Jackson and the Olympians: Legends

Thanatos is lean and muscular, with a regal face, honey gold eyes, and black hair flowing down his shoulders. His skin is the color of teakwood, and his dark wings glimmer in shades of blue, black, and purple. Thanatos is frequently mistaken for the god of love, Eros. Hazel describes him as the most beautiful man she has ever seen and called him timeless and remote.

Thanatos was believed to be merciless and undiscriminating, sharing a mutual hatred for most of the other gods and mortals. However, he may resent his job because doing so could cost his demigod rescuers their lives and he would be forced to bring them to the Underworld, prompting the other to ask if he even wanted to be free. Thanatos explains to them that death isn't fair, but it is his duty to stop souls from returning. He may have a dark sense of humor as once he is free. However, this could simply be him doing his job. Thanatos doesn't seem to care about returning favors.

Thanatos was born to the primordial god Nyx through parthenogenesis or with her husband, Erebos. His twin is Hypnos, god of sleep. After Hades took control of the Underworld, Thanatos became his lieutenant.