Penny is a soft-spoken young woman who is known as the local tutor, teaching the children, Vincent and Jas, almost every day. She is also the daughter of Pam and often struggles to cope whenever her mother is out drinking. Penny is quite shy and has no grand ambitions other than to get married and start a family. 

For Penny, I imagine a timid voice for her, but also quite sweet especially when talking to Vincent and/or Jas. 

This is a character who doesn't shout.