Jeff "Swampy" Marsh
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Jeffrey Kent "Swampy" Marsh is an American animator, voice actor, writer, director, and producer. With Dan Povenmire, Marsh is the co-creator and co-star of the Disney Channel animated series Phineas
Marsh met Dan Povenmire while working on The Simpsons and continued to work alongside him on Phineas and Ferb.
Perry the Platypus
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Perry the Platypus, also known by his codename Agent P, is a fictional anthropomorphic bipedal platypus from the American animated series Phineas and Ferb, Milo Murphy's Law and Agent P, Under C. Perr
Original storyboard artwork for Perry in the pilot episode "Rollercoaster."
Dee Bradley Baker voices Perry.