Chimera is one of Echidna's Children.
Appearances
Hercules: the Animated Series
In the episode "Hercules and the Big Games" Hades visits Echidna and has her gather her entire family (including Chimera) to attack Athens. Meanwhile, Hercules is winning every event and enjoying being a hero (or sports hero, as Phil calls it) – until Ares remembers, in a manner similar to anti-doping, that he is a demigod, and only mortals can compete; hence, half his points are taken off. But when Echidna and her family arrive, he puts aside popularity to save the day, with an assist from Ares and Athena, who are working together for once.
Once Upon a Time
Chimera don't actively appear on the show and was implyed to be a common specie in Fairytale Land. King Midas kept one of these creatures as a golden statue. At Lancelot's village, they can be eaten as food and their blood is used as an ingredient for the Curse of the Empty Hearted.