Isabella Garcia-Shapiro (Alyson Stoner) is 10 years old and is the leader of the Fireside Girls. Her introduction line is "Whatcha doin'?" She can change her voice as Ferb can, usually higher, sometimes lower, and often assists the boys in their plans, enlisting the whole troop of girls in the process (often to obtain new badges or other credits related to the Fireside Girls). In the episode "One Good Scare Ought to Do It!" it is revealed that her biggest fear is losing Phineas, whom she has a crush on. In the episode "That Sinking Feeling" she goes on a romantic cruise with Phineas. Her mother, Vivian Garcia-Shapiro (voiced by Eileen Galindo) is a fast-talking Mexican woman. Isabella doesn't usually dress like the other Fireside Girls, instead wearing a pink dress and white shirt, though she has been seen wearing their uniform. When standing next to the other Fireside Girls with her sash, Isabella's clothes do resemble the Fireside Girl uniform, though pink. she always wears bows with her outfit, most commonly pink to match her dress though she has other colored bows to match whatever outfits she's wearing. This difference is used to make her stand out as the troop leader. It is known Isabella will get mad or upset if Phineas doesn't notice her. For example, in the two-part episode "The Chronicles of Meap" Isabella was helping Phineas to find his and Ferb's alien friend Meap using a "cute tracker". However, something kept interfering with the device, and every time Isabella insisted that it was herself Phineas contradicted her. It was later revealed that he had pre-programmed her "cute level" into the tracker beforehand so that it wouldn't interfere. It was also seen that Isabella was upset that Phineas didn't notice her in the episode, "That Sinking Feeling." In an episode in Season 3, Phineas takes Isabella on a romantic date. Isabella has no love interest for Ferb, but it is shown they are good friends. In the Christmas special it is revealed that Isabella is Jewish, when she says that she celebrates Hanukkah instead of Christmas. In "Phineas and Ferb's Quantum Bugaloo," it is presumed in a line by Candace's daughter, Amanda, that Isabella grows up to marry Phineas, although she could end up marrying Ferb,which bothered her. Dan Povenmire has also stated that "It was just a joke, and Isabella will actually marry Phineas". Her signature colors are orange,blue,pink,and purple.