The serpent symbolizes a number of things in mythology. Typically, however, serpents represent the expression of both good and evil. Often serpents were associated with fertility, medicine, vengeance and or vindictiveness.
No: the Midgard Serpent is of Norse Myth origin.
In the bible it represents wisdom and evil.
Not in Roman Mythology.
Jörmungandr, the Midgard Serpent.
The underworld
Hydra was a many headed serpent in Greek mythology
Chimaera, which had a lion's head, a goat's body, and a serpent's tail:
These serpent deities in India are known as nagas, ie the answer is NAGA,.. this answer was provided by "Ross Smith"
In Aztec and Toltec mythology, Quetzalcoati was the feathered serpent god.
Hydra.
For the Hindus it's Naga. There are no Buddhist deities.
Poseidon is the god of the seas in Greek Mythology.