Perry the Platypus, codenamed Agent P, is Phineas and Ferb's pet platypus, who, unknown to his owners, lives a double life as a secret agent for the O.W.C.A. (The Organization Without a Cool Acronym) (a.k.a. "The Agency"), a government organization of animal spies. In the Agency, his immediate superior is Major Monogram.
Perry is normally found acting like a mindless platypus in front of his owners, Ferb and Phineas. He is also serious while not undercover, even in front of Major Monogram when he does anything silly ("Jerk De Soleil", "Boyfriend From 27,000 B.C.", "Traffic Cam Caper", "Skiddley Whiffers").
Perry also appears to be selfless and devoid of vanity. In "The Best Lazy Day Ever" , it is only after he turns everything affected by the Ugly-inator back to normal that he reverts himself to his normal state. He also deeply cares about the Flynn-Fletcher family and is afraid to lose them and would take immediate action whenever they are threatened ("Journey to the Center of Candace", "Phineas and Ferb Get Busted!", "Oh, There You Are, Perry", "Across the 2nd Dimension"). He is nice to not only his allies, but to his nemesis Dr. Doofenshmirtz as well, though only at some occasions ("Thaddeus and Thor", "Brain Drain", "Skiddley Whiffers").
- Project 7 Zone - Partner with Hury Freeman(As Human)