Wikipedia, tongue nowhere near its cheek or so firmly planted it threatens to pierce the flesh,, says:
Lippy the Lion & Hardy Har Har are a pair of anthropomorphic Hanna-Barbera cartoon characters, a lion in a tattered top hat and vest and a hyena in a porkpie hat and bow tie, respectively. The latter's name is ironic, as it's an onomatopoeia for laughter and Hardy is an eternal pessimist. Hardy is the stereotype of someone with a very deep Major depressive disorder; indeed, one short implies that expression of joy or happiness actually puts Hardy in pain.
In Australia he was known as "Prozac Dingo."