Vanessa Doofenshmirtz is the daughter of Heinz and Charlene Doofenshmirtz. Her birthday is June 15th, and is sixteen years old as of "Dude, We're Getting the Band Back Together."Vanessa tends to be sarcastic and generally acts like a normal teenager. She cares about her reputation, especially when her clothing gets switched with Candace's clothes. Vanessa has always hung out with the "goth" or "punk rock" crowd, as seen in her childhood photos and her group of friendsHer desire to have a car of her own is quite clear. She tries to prove she is responsible enough to own her own car by trying to get a rare element (Pizzazium Infinionite) her father needs in the Super Duper Supermall This is also evident when Doofensmirtz told her he'd brought her a gift, she exclaimed "A car!" with excitement and was disappointed when she found out it was just a doll that she had wanted when she was 7She is, or at least was, on her school's swimming team. She also took ballet as a young girl and was in a school production.Although she tries to deny it when around her father, she is a little evil, as evidenced in "Phineas and Ferb Summer Belongs to You!," she "rented" a scooter, pointed a hairdryer at Major Monogram, and took Agent P's hover car. She also took the Mary McGuffin doll from a little girl, and has aided in parts of her father's plans. Also, she admits that she's at least a little evil.
Vanessa has a crush on Johnny. Later it is revealed that Johnny is Vanessa's boyfriend. She implied that while she was partying with her friends at a dump.