Penny Robinson is a character first created in the 'Lost in Space (1965)' series, then brought to life again in the 1998 Movie 'Lost in Space', the 2003 John Woo failed pilot 'The Robinsons: Lost in Space' and now in the current 'Lost in Space (2018)' series.
From the Casting Brief:
Quick-witted and contrarian, but her sarcastic and tough exterior covers a romantic soul.
If the Robinsons have a black sheep, she’d be it.
She’s the most social person in her family, with the best sense of humor of any of them.
Penny grew up the victim of middle-child-syndrome, caught between a superstar older sister who could do no wrong and a baby brother who everybody was afraid couldn't do anything right.
She didn't want to leave her home on Earth, and struggles with the loss of everything and everyone she knew
During the time on the alien planet, Penny meets a boy from one of the other crashed Jupiter ships. He and her have a difficult relationship due to his father. But Vijay rebels a bit to the liking of Penny. [likely Vijay Dhar]