bipolarvert
The bipolarvert displays characteristics of both an introvert and an extrovert, but at different times. One day this person is the life of the party and another day she is content to sit at home all weekend and catch up on her favorite tv series. She/he enjoys both being around lots of people and quiet time alone.
I never know what Tara is going to want to do, she's such a bipolarvert. Last weekend we went salsa dancing and she danced with every guy in the bar but tonight she just wants to stay home and read.