- "It's funny--all my cases revolve around her. I guess she's just a magnet for trouble." - Touch Detective 2 ½ description
- "Dream the dreams that have never been dreamed." - Penelope's motto
In Touch Detective all of Mackenzie's cases involve her in some way or another: in Case One, her dreams are stolen by Antoinette, in Case Two she is kidnapped by the Astronomer and Lynsey, in Case Three she meets a snow fairy and helps him escape from the ice skating rink before it closes down, and in Case Four, she witnesses the assault of a flea in the Circus and helps Mackenzie figure out who the attacker is.
In Touch Detective 2 ½, she plays a lesser role than in the first. Only Case One revolves around her. However, she still assists Mackenzie during her cases by giving her hints.
Penelope is from a very rich family, so she has a very lavish lifestyle. However, she is rather air-headed and forgetful, and is notorious for doing strange things such as abruptly disappearing for a period of time, or not talking to anyone (including herself) and instead pantomiming for a week. However, she is very sweet girl to everyone, despite her undeniable outlandishness. Her favorite food is bananas, to the point her room has a banana stand and stuffed bananas.