Genius

The Genius was a spirit of a family in Roman mythology.

Depiction
A Genius was usually depicted as a young, naked, and winged person. The Genius of a place was shown as a serpent.

Abode
A Genius was a guardian spirit of an individual person. Although they are most commonly attributed to individuals, a Genius could also preside over a family, house, city, or population of people.

Mythology
The Genius was an ancestor of a family who lived in the Underworld and ensured that the family would continue. Eventually, the Genius became a protecting spirit that was unique to each individual and guided them through life. Each Genius was worshiped on each individuals birthday.