vivacious
Meaning: lively, sprightly
Usage: The vivacious clown makes all of the children laugh and giggle with his friendly antics.
animated
Meaning: lively
Usage: When he begins to talk about drama, which is his true passion, he becomes very animated.
ebullient
Meaning: extremely lively, enthusiastic
Usage: She became ebullient upon receiving an acceptance letter from her first-choice college.
effervescent
Meaning: bubbly, lively
Usage: My friend is so effervescent that she makes everyone smile.