Dr. Hirano is Stacy and Ginger Hirano's mother. She removed Isabella’s tonsils ("I Scream, You Scream"). Dr. Hirano was first mentioned when Stacy decided to tell Candace that she was getting her ears pierced.
Dr. Hirano is Stacy's mother. On Phineas and Ferb's parents' anniversary, they are only seen chatting on the phone ("Dude, We're Getting the Band Back Together"). She also seems to think that her daughter is not very smart, due to Stacy frequently asking Candace to call her mom "and tell her that" when Candace refers to Stacy as a genius. ("Let's Take a Quiz", "Don't Even Blink").
Dr. Hirano thinks Candace is flighty and unfocused because she rather bust her brothers than doing what she and Stacy are doing. However, she seems to think of her differently after seeing how determined she is to bust her brothers. ("Robot Rodeo"). She is also referred to as Mrs. Hirano by her.
Dr. Hirano seems to be friends with Linda, but they only appeared together once. Before Candace and Stacy got in the house, they were talking about how Dr. Hirano's mom had never let her go to a concert when she was a kid ("Robot Rodeo").
Dr. Hirano is the mother of Ginger. She's impressed by the number of trophies that Ginger has. ("One Good Turn")
Their relationship is currently unknown, but she removed Isabella's tonsils. ("I Scream, You Scream")
- "I Scream, You Scream" (Speaking cameo)
- "Dude, We're Getting the Band Back Together" (Speaking cameo)
- "Does This Duckbill Make Me Look Fat?"
- "Robot Rodeo"
- "One Good Turn"
- Phineas and Ferb The Movie: Candace Against the Universe (Non-speaking cameo)
- "I, Brobot"
- "Don't Even Blink"
- "Let's Take a Quiz"
- "The Secret of Success"
- "For Your Ice Only"
- "Great Balls Of Water"