Hermes

Son of Zeus and of a nymph called Maia or Maya (a pleiad), he was the herald of the gods.
He was born in mount Cyllene and as soon as her mother left it alone, he turned into a child and escaped seeking for adventures. He arrived to Pieria, in Thessaly (Thesalia), where his brother Apollo kept his cattle, and stole it, hiding any evidence of the way he had taken. When Apollo discovered the missing, he looked for his cows everywhere until he decided to offer a reward. Some satyrs discovered the cave where Hermes had made a lyre with parts of the cows and was playing it and Hermes was taken to Zeus. Everyone thought him too young to be able to steal, but Apollo made him confess and return him the arrows and the bow he had just stolen to him. Hermes (Mercury to the Romans) said he had divided the cows into 12 equal parts and had offered them to the 12 gods, eating the part belonging to him.
He was forgiven after he gave Apollo his lyre, made with a tortoise (an animal that from that moment was his symbol) and the intestines of a cow and with the promise he would never lie again, thus, he was made god of travelers, orators (with some irony), thieves, merchants and literature. He also was made god of shepherds by Apollo, who gave him his golden wand with two snake heads in exchange of Hermes'newly-invented pan-pipe, and god of traffic by Zeus.
This gods is thought to have begun to be as a fertility god in pre-Hellenic times and is also associated with Thoth, Egyptian god of wisdom and knowledge.
He was represented as a child with a winged hat, a stick and winged sandals, also as a man with chains going out of his mouth and to the ears of other figures. He was a popular god among Greeks, who thought he provided good fortune.
A legend prays that Hera hated him until he dressed like a baby and Hera fed him as if he was the small Ares, his son. After realising he was not Ares, she adopted him as her child.
Hermes was the one that stole Zeus' tendons from Typhoon's sister and saved him from being eaten by the monster. He was also the one that told Ulysses how to avoid being bewitched by the black witch Circe, by eating a special herb.
He persuaded the nymph Calypso to let Odysseus free.
Among his children he had Abderus, Autolicus, the thieve; Echion, the herald of the Argonauts and Daphnis, a poet. Hermaphroditus was also his son, but with Aphrodite, and Pan, with Dryope.
The Greek hermeias in the routes were consecrated to him and as herald of gods, he had as one of his duties to guide the souls of the dead to the Underworld where Proserpina was queen, he was also related with dreams. His greatest strength is his power on rain.