This description seems to fit that of the werewolf.
Werewolves are usually considered the preserve of European folklore, but they do appear elsewhere. Shapeshifters, similar to werewolves, appear in many cultures, especially Native American traditions.
In Hungarian mythology, Isten is the most important of the gods. He controls the world and is responsible for the fate of humans.
Also known as Sand or Sandy, Sha Wujing was banished by the Jade Emperor to earth, where he became an awful sand-eating demon. He carries a double-bladed staff with a crescent moon at one end, and wears a necklace of skulls.
In many Native American traditions, Coyote is a deity often portrayed as a trickster figure and/or culture hero.
In Greek mythology, the Minotaur has the body of a man and the head of a bull, as he is the product of his mother Pasiphae's obsession with the Cretan bull. Their offspring was a punishment sent by Poseidon against Pasiphae's husband, Minos, King of Crete, who was supposed to sacrifice the bull but chose to keep it for himself.
More characters from Journey to the West.
Antinous was part of the entourage of the Roman emperor Hadrian. There were rumours of a relationship between the two, and the emperor showed great grief after Antinous' death, going so far as to deify him.
In Norse mythology, Odin's son Baldr is impervious to harm, his mother Frigg having made everything on the earth promise not to hurt him. But Frigg forgot to ask the mistletoe plant. When the troublesome god Loki learned of this he fashioned a spear from the plant and used it to bring about the death of Baldr.