Katie is one of the Fireside Girls in Danville troop 46321.
BiographyEditShe, along with Ginger, Milly, and Holly helped Phineas and Ferb create S'winter.
She also helped in building the time machine with the rest of the troop to rescue Phineas, Ferb, and Candace. She and Holly also participated in the Chariot Race with Isabella as their leader.
When Isabella was about to ask Phineas to the Night of the Falling Stars girls' choice dance, Katie interrupted by asking Phineas to sign some liability wavers regarding the upcoming space launch.
Katie has blond hair in two low pigtails with red elastics, green eyes and is light-skinned, and wears a uniform with a red collar with larger shoes and no socks.