Penny Hofstadter's Lover Type is Spark

The Big Bang Theory. The Affectionate, Expressive Lover.

Penny Hofstadter says what she feels out loud, whether that is affection, frustration, or a pep talk someone desperately needs, which makes her a clear Spark. She reads the guys in her life better than they read themselves, sensing when Leonard needs reassurance or when Sheldon needs a strange kind of patience. Openly affectionate and generous with hugs and honesty alike, she never makes anyone guess where they stand.