Penny is a scientist and inventor in Diamond City and also the granddaughter of Dr Crygor Penny also hopes someday she can become a pop star and listens to pop music in her spare time even when she's making inventions and sometimes she listens to it with Ana well she helps her with inventions of hers.

For what Penny would sounds like I would imagine she would sound like Penny's current actress Fryda Wolff however she could also have a high-pitched joyful teenager like voice