"Mercurial" is derived from Mercury, the god of Speed, Changeability, and Mischief. The speed connotation has declined a good bit, and the word now indicates mischief and changeability.
Loki is the God of mischief
The Greeks did not have a particular god or goddess who personified mischief. I think, however, that you are probably thinking about Pan, the half-goat god of the Wild. His Roman counterpart was Faunus.Similarly, satyrs and fauns are generally portrayed in modern culture as being raucous and mischievous, though the Greeks and Romans didn't necessarily intend for them to embody that.
That would be Mercury, known to the Greeks as Hermes.
Hermes
I think you might be thinking of Faunus, which is the Roman counterpart to the Greek Pan, but they are only gods of the woods. There is no Greek or Roman deity associated with the concept of mischief.
Faunus
Mercurial
"Mercurial" is derived from Mercury, the god of Speed, Changeability, and Mischief. The speed connotation has declined a good bit, and the word now indicates mischief and changeability.
A Roman god of Fields and Woods
The name of Greek God is Teos.
Pan. He was also the god of nature in general. Pan was the Greek god. His Roman counterpart was Faunus.
Loki would most definitely be the Norse god of mischief.
Loki is the God of mischief
Loki is the Norse god of mischief, not a Germanic god. He is a prominent figure in Norse mythology known for his cunning and trickery.
The Greeks did not have a particular god or goddess who personified mischief. I think, however, that you are probably thinking about Pan, the half-goat god of the Wild. His Roman counterpart was Faunus.Similarly, satyrs and fauns are generally portrayed in modern culture as being raucous and mischievous, though the Greeks and Romans didn't necessarily intend for them to embody that.
That would be Mercury, known to the Greeks as Hermes.