Isabella Garcia-Shapiro is a major character in the Disney Channel animated series Phineas and Ferb. She is the neighbor and one of the best friends of Phineas Flynn and Ferb Fletcher. Isabella has a huge crush on Phineas (though he does not ever notice it in "Act Your Age" and spends most of her days participating or helping with his and Ferb's projects. She also spends time trying to earn Fireside Girls patches, and is also great friends with the members of her troop in the Fireside Girls Troop 46231.
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↑Amanda calls Isabella her "Aunt Isabella" in "Phineas and Ferb's Electric Bugaloo." Isabella reasons that means she's going to marry Phineas. However, Candace reminds her friend that Isabella could marry Ferb. Second, it could be reasoned that Amanda and her brothers simply considered Isabella as an honorary aunt. Another thing considered in "Act Your Age," Isabella and Phineas begin a romantic relationship in the future, further escalating that Isabella's assumptions she will marry Phineas in the future is possible.