Which word best describes someone who is of convivial nature?

The word that best describes someone of a convivial nature is gregarious.

Here's why:

* Convivial means friendly, lively, and enjoying the company of others.

* Gregarious means fond of company; sociable.

While other words like outgoing, friendly, or social could also be used, gregarious most accurately captures the essence of being convivial, emphasizing the enjoyment of being around others.