What to wear: For Phineas, you'll need an orange and white striped tee, blue shorts, matching Converse, and an orange wig. For Ferb, you'll need a white button-down, purple high-waisted pants, black Converse, and a green wig.
How to act: You're just two best friends that tend to get into some wacky scenarios. Phineas should start every conversation with, "Ferb, I know what we're gonna do today!" while Ferb should say nothing at all.