a lively person
effervescent - lively
In a literal sense, the word ‘effervescent’ describes a liquid that contains or releases bubbles of gas, like a fizzy drink. That usage has been adapted to figuratively refer to a bubbly, active, and excitable person or quality. In that sense, it is always used positively because such people are considered to be fun and uplifting to be around.
I assigned Jane to deal with the customers because they tend to react very favourably to her effervescent personality.
The actor brought a distinct effervescence to the movie. Every scene he was in was imbued with humour and energy.
Before my big job interview, I was filled with nerves, but also effervescent excitement at the opportunity before me.