Percy Jackson and the Olympians: Legends

Hypnos has the same teakwood skin as his brother. It's unknown if he has the same physical size and musculature of his brother, though, as Hypnos is said to be quite lazy, but it's been worth to notice that he's a shapeshifter. He is often shown with small wings on his head.

Though not a villain or immoral, Hypnos is far from being the most responsible or honorable god to exist. He has been said to do nothing much but sleep and did not play a role in the last Second Olympian War, implying that he is a lazy god (if not the laziest). He also shows to be very cowardly in the past, having hid himself in his mother's arms to avoid Zeus' anger, and when Hera requested his assistance against Zeus yet again, Hypnos only complies when she swore to give him Pasithea's hand in marriage. He was also described to have used his power immaturely when he was a child, much to the other gods' chagrin.

Although Hypnos was not one of the most active gods of that time, he was famous for the role he had played in the story of Endymion and Selene, the Titaness of the Moon. When Endymion was granted immortality and eternal youth by means of endless sleep, he received the power to sleep with his eyes open by Hypnos so he could constantly watch his beloved Selene. The reason Hypnos granted him this gift was because the god of sleep loved the young king/prince/shepherd and thus could always gaze in his beautiful eyes. Years later, he would hide in the Mansion of Night to escape Zeus' wrath.