I think that was Mercury. Also Hermes was a fast mover too.
Mercury
"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.
Diana was the Roman God who was the guardian of wild beasts, horses, and domesticated animals.
The Romans associated Greek god Hermes with Mercury.
Loki is the God of mischief
Mercury was the Roman equivalent of the Greek god Hermes. He was the messenger for the gods, known for his speed.
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.
Diana was the Roman God who was the guardian of wild beasts, horses, and domesticated animals.
Mercury.
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.
The word "mercurial" comes from the name of the Roman god Mercury.
There is not - although Seth being the God of Mischief could be loosely associated with comedy.
The Greeks did not have a specific god associated with mischief. The closest they would have is Hermes, who was the patron of Thieves and was considered the most cunning, after Athena.
Mercury
The name of Greek God is Teos.
Pomona.
Jupiter was not associated with the planet Jupiter.