Percy Jackson and the Olympians: Legends

Amphithemis resembles a cross between a satyr and a centaur with ram horns, blue eyes, and fawn brown fur. As a mania, his eyes glow red when he is angry.

Amphithemis is eager to help, however, after spending thousands of years in Tartarus, his mental state has fractured. He suffers from short term memory loss and relies on smells to remember people.

Thousands of years ago, Amphithemis was tasked with guarding an infant demigod. However, he lost track of the child. Soon after, he was thrown into Tartarus by Zeus and cursed by Hera. Eventually, he died obsessing with finding the child and he became a mania. He spends his after life searching for the child he lost. One day, he encounters Nico di Angelo and asks him if he has seen a child. After realizing Will Solace is missing, the son of Hades asks him if he has seen his boyfriend. Later, Will tells Amphithemis that the monsters have the baby, sending the mania chasing after them. Nico is left feeling sorry for Amphithemis who will be left wandering Tartarus forever futilely trying to fulfil his purpose. After calming down, Will agrees that Amphithemis' soul deserves to be put to rest, but Nico doesn't know how to help him.