characterized by humour or playfulness
jocular - humourous
A person described as being ‘jocular’ is considered to be cheerful and fond of making people laugh. It is usually used in a positive sense socially, though in a professional setting there is a time and a place for jocularity. A thing that is jocular is intended to be funny or playful.
Alex is seen as the joker in the office due to his cheerfulness and jocular nature.
I wonder if something is bothering Sarah? She isn’t in her usual jocular mood today.
This is an important business meeting, so I would encourage you all to keep jocularity to a minimum.