"[He is] fierce, cunning, and good with a grappling hook..." — Heinz Doofenshmirtz, referring to Perry[source]
"He is a platypus, they don't do much. " — Phineas when people ask what can Perry do[source]
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. (a.k.a. "The Agency"), a government organization of animal spies. In the Agency, his immediate superior is Major Monogram.