Perry the Platypus

Perry the Platypus, codenamed Agent P, Named Venger (as a Supervillain), is Phineas Flynn and Ferb Fletcher'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.

Perry has a lair under the Flynn-Fletcher's house that can be entered through various passages. One example is the Chimney Vator, in which he encounters Santa.

His nemesis is Dr. Heinz Doofenshmirtz. Perry's mission is almost always foiling the doctor's plans, which he successfully accomplishes almost every time even with minimal details about the plans. During these missions, his battle with Dr. Doofenshmirtz cleans up what Phineas and Ferb have been working on that day. For one mission (and only one mission) his nemesis was The Regurgitator, whose current nemesis is the world.

Disguises
Perry is the Flynn-Fletcher family's only pet that has been mentioned in more than one episode, or rather, every one (others in only a single episode include the deceased Bucky, the freed Goldie, the captured Mr. Cutie Batutie, or Steve who blends into the surroundings). In order to prevent his family and other people from learning his identity, Perry takes steps to reinforce the perception that he is "just a mindless animal that doesn't do much". His primary method to achieve this status is to direct each of his eyes outwards in opposite directions, creating the "dumb" look. Once he is certain that he is no longer being watched, Perry drops the facade and retrieves his secret agent hat, a fedora. During his stint as Perry the Teenage Girl, Perry continued to use this method to mask his true intelligence.

Perry has become adept in switching between his two disguises and can perform the switch in rapid succession. ("Traffic Cam Caper", "The Chronicles of Meap", "No More Bunny Business", "Picture This", "Swiss Family Phineas")

Despite frequent contact with Perry, Dr. Doofenshmirtz does not recognize his enemy unless Perry is wearing his hat. If Perry enters Doofenshmirtz's building without wearing the hat, the doctor will act surprised and exclaim "A platypus?". Curiously enough, however, once Doofenshmirtz has seen Agent P wearing the fedora, if Agent P removes it, Doofenshmirtz is still able to recognize him ("Get That Bigfoot Outa My Face!", "Oil on Candace", "I Scream, You Scream").

Perry's most successful disguise might be that of when he and Candace accidentally switch bodies. ("Does This Duckbill Make Me Look Fat?") When Perry (in Candace's body) first enters his lair to receive his mission briefing, Major Monogram thinks that there has been a breach of security. Once the hat falls on Perry's head, Major Monogram identifies him as "Agent P" and praises Perry for the "brilliant disguise", while Carl is disappointed to learn that it is not a real girl. Likewise, when Perry breaks in to Doofenshmirtz's building, the doctor exclaims "A teenage girl?". After Perry puts on the fedora, Dr. Doofenshmirtz shrieks, "Perry the Teenage Girl?". While all the Agents wear similar hats, it is this particular hat that allows people to identify Perry as Agent P, as shown in No More Bunny Business when Dennis (Agent) wears Perry's hat and a scanner is shown, scanning an apparent bar-code like structure to hack into the O.W.C.A. as Perry.

Agent P has used the "Groucho glasses" to narrowly avoid being recognized by Linda Flynn in the street ("Flop Starz"), masqueraded as Dr. Lloyd Wexler ("A Hard Day's Knight"), and disguised himself as Ferb and Norm ("Traffic Cam Caper"). Inside the Superduper Mega Superstore, Perry wears a Hawaiian shirt, sunglasses and a bowler hat, none of his acquaintances at the mall are able to recognize him. ("Vanessessary Roughness")

Abilities and Equipments
It is currently unknown how Perry was recruited into the Agency in the first place, nor what kind of training Perry has undergone before receiving missions. But it is known that he was recruited ever since he was really young, almost a baby, when Phineas and Ferb adopted him.

For a platypus, Perry has above-normal strength, speed, stamina, accuracy, and reflexes, (According to Doofenshmirtz, he can perform "highly improbable judo maneuvers") making him a formidable hand-to-hand combatant. Perry can subdue his nemesis, Dr. Doofenshmirtz, with ease. Perry is familiar with operating most kinds of machinery and vehicles, even if they're Doofenshmirtz's inventions (although perhaps this is due to the fact that most of them have an obvious off-switch, plug or self-destruct button). Perry is quick-thinking and very efficient in his missions, especially when compared to his temporary partner, the British spy Agent Double 0-0. For example, while Double 0-0 is trying to use his laser-watch to cut through his metal restraints, Perry simply throws a brick at the remote control, damaging it and freeing them both ("Elementary, My Dear Stacy"). He has also been shown to respond to and understand English. Perry can also play the guitar and read sheet music. ("The Lizard Whisperer")

Perry is able to pull a remarkable number of items out of the air from behind his back. Where exactly they are hidden is not obvious because Perry typically does not wear clothes. The most frequent gadgets Perry uses are:
 * Wrist communicator. Perry wears a watch-like communicator on his front left paw. It is normally hidden by his fur ("Traffic Cam Caper", "Oh, There You Are, Perry", "Swiss Family Phineas", "No More Bunny Business", "Fireside Girl Jamboree" ).
 * Video communicator. Agent P uses a PDA-like, video-chatting device to communicate with his headquarters. Dr. Doofenshmirtz once built a "Monster Truck Locate-inator" that looked the same as Agent P's communicator, albeit in a different color.
 * Fedora. Agent P's fedora serves several purposes. Firstly, the hat identifies him as a secret agent. In ("No More Bunny Business") it appears to have a hidden bar-code that allows him to access the computer. There is a spring inside the hat that, when pulled, starts a motor which causes the brim of the hat to spin. The hat can then be used as a circular saw. On at least one occasion, Agent P is able to pull an object out of his hat, which he uses to fight Dr. Doofenshmirtz or help him escape: a can of Fancy Cheese Spray ("I, Brobot") and a hot dog. The hat may also be used like a boomerang. In ("Voyage to the Bottom of Buford") Perry uses his hat in this way to knock Dr. Doofenshmirtz's controller to the ground, damaging it and setting him free. A hot dog is blown out of his hat in ("Backyard Aquarium").
 * Parachute. Agent P, while many times escaping by jumping off of some building, plane, etc., is able to use a parachute with a picture of his face on it. It is unclear where he keeps it.
 * Grappling gun. Agent P uses it to climb up the wall of D.E.Inc.
 * Hoverjet. Agent P's hover jet is platypus-shaped, and is hijacked and mistaken by Phineas to be one of Ferb's inventions in the episode "Ready for the Bettys".
 * Scooter. Agent P has a white scooter with a green stripe down the middle ("Flop Starz", "Does This Duckbill Make Me Look Fat?" ).

Background Information
Phineas can tell the difference between Perry and all the platypus in Danville (there are quite a lot, oddly enough), though they seem to look exactly the same. Phineas was even able to tell if the others were just slightly more bluer than Perry or even smelled different. ("Oh, There You Are, Perry")
 * There are many Agents other than Agent P. Many of them are named in "Traffic Cam Caper" (and seen in "It's About Time!").
 * Perry has a badge that he carries with him. It has the word "Spy" and an image of Perry peeking over a fence. ("I, Brobot")
 * When Perry has a day off he watches romantic soaps and eats potato chips. ("Oil on Candace")
 * Perry usually makes chattering sounds only. There have been occasions where he makes other sounds: a weary sound when he has to walk back up the same flight of stairs ("Got Game?"), releasing a breath of relief ("Candace's Big Day"), and sighing and sneezing ("Hail Doofania!"). His analog in the Victorian age, the Platypus monster made growling and moaning sounds ("The Monster of Phineas-n-Ferbenstein"). He also imitated Candace one night after she forced him out of the house (the reason for this involved a glass of water and Candace tripping). ("Oh, There You Are, Perry") Although it should be noted that most of these are pretty much variations of his usual chattering.
 * Perry receives wages from the O.W.C.A. for his work. He is seen paying for Doofenshmirtz's door ("Lights, Candace, Action!") and cans of oil ("Traffic Cam Caper"). Major Monogram has mentioned a huge bonus check ("The Lake Nose Monster"). He gives a girl $20 for her skateboard. ("Leave the Busting to Us!").
 * Perry has an e-mail account where he receives messages from Major Monogram. ("Hail Doofania!")
 * Perry is most likely ambidextrous because he is seen writing with his left hand ("S'Winter") and with his right ("The Magnificent Few")
 * Ferb occasionally mentions that platypus are the only mammals to lay eggs. In truth, all monotremes (such as echidnas) lay eggs, so Ferb's statement is incorrect. Phineas once states that one day Perry might lay an egg—a strange thought, as Perry is male. ("Rollercoaster")
 * A marketing executive incorrectly believed that Perry is a marsupial ("Toy to the World"). Baljeet correctly identified Perry as a monotreme later that summer ("Swiss Family Phineas").
 * Phineas mentions that Perry liked music even when he was young (shown in picture to the right). As Perry has been playing with Phineas since both are this young, Perry may have been around at the time when Bucky lived with the family. ("Oh, There You Are, Perry")
 * Candace, while trapped in Perry's body, is shown "sweating milk". Only female platypi have mammary glands and Perry is obviously a male, so Candace's body should not have been affected in this way. Then again, Candace is a female. ("Does This Duckbill Make Me Look Fat?")
 * Perry consumed an entire cheese wheel made by Dr. Doofenshmirtz. The cheese wheel was much larger than Perry, giving him a large bulge around his stomach after he ate it. ("Lights, Candace, Action!")
 * Perry has been shown twice in his possible future. When hit by the Age-Accelerator-inator, he is seen much older and wrinkly with a cane. (Lights, Candace, Action!). Perry, 20 years later in the story line, is shown walking with a walker but still old and wrinkly. ("Phineas and Ferb's Quantum Boogaloo")
 * Dr. Doofenshmirtz owns a mint green pair of boxers with Perry's face in agent form, though Doofenshmirtz claims he had them way before he met Perry. ("Bubble Boys")
 * Perry wears boxer shorts under his fur. ("Unfair Science Fair", "Perry Lays an Egg") which means that the line "Besides his hat he wears no clothes", in the song My Nemesis, is incorrect. But, in "Toy to the World", the head person of the table came in only wearing boxers, which Ferb replied to, " That man isn't wearing any clothes."
 * Perry has been shown to break the fourth wall. ("Got Game?")
 * Major Monogram calls Perry Agent P, but there are a few other agents who could be called Agent P, including: Pinky the Chihuahua ("Day of the Living Gelatin", "Isabella and the Temple of Sap"), Peter the Panda ("It's About Time!") and Planty the Potted Plant ("No More Bunny Business").
 * Phineas and Ferb have seen Perry as Agent P once (Toy to the World), but they thought he was a toy-design for Perry the secret agent Platypus.
 * Phineas and Ferb see Perry as an agent a second time when the captain of Smile Away Reformatory School tries to get Phineas and Ferb. Dr. Doofenshmirtz and Perry interupts them, but it was just a dream. ("Phineas and Ferb Get Busted")
 * Perry knows math, as in one episode, he is seen measuring the trap put on by Dr. Doofenshmirtz. He is also smart enough to be able to read ("I Was a Middle Aged Robot"), write and work Phineas and Ferb's machines easily ("Picture This").
 * Perry must enjoy Christmas because he smiles whenever a Christmas character appears on screen ("I, Brobot, Phineas and Ferb Christmas Vacation!").
 * Perry knows how to drive. Some of the vehicles he could drove are a hovercraft car ("Ready for the Bettys", "Traffic Cam Caper", "One Good Scare Ought to Do It!") and a banana truck with aid of stilts ("Suddenly Suzy"). He also could pilot a plane. ("One Good Scare Ought to Do It!")
 * Perry knows how to play cards and has done so at a casino. ("Undercover Carl")
 * He knows how to play the guitar. ("The Lizard Whisperer")
 * He has two other names: P to the P and P Square, both of which symbolizing the numerous Ps in his name. ("Phineas and Ferb Musical Cliptastic Countdown")
 * Perry's DNA code as 74218390. ("Just Passing Through")
 * Perry doesn't like pink. ("No More Bunny Business")

Theme song
Perry, when he is on duty as Agent P, has his own theme. Its lyrics are mainly "Dooby, dooby, doo-ba". The complete version and the accompanying video is first seen in "Rollercoaster" and can be found here. Since its introduction, the theme song has had many different versions:
 * In "Does This Duckbill Make Me Look Fat?", the theme music stalls multiple times as Perry in Candace's body repeatedly gets stuck going down a tube. In addition, a parody of Perry's normal theme song, "Perry the Teenage Girl", is also featured.
 * In "Ready for the Bettys", when Phineas and Ferb accidentally find Perry's lair and temporarily become secret agents, the theme song is changed to repetitions of "Phineas and Ferb", sung in the same style.
 * In "The Best Lazy Day Ever", when Agent P is struck by the Slow-Motion-Inator, his theme song slows down as well.
 * In "Got Game?", after Agent P walks down a very long flight of stairs and sits down in the chair, the people singing his theme song also sound like they are worn out.
 * In "Hail Doofania!", when Perry cannot enter his lair due to the protective collar he is wearing, the song keeps repeating every time Perry tried to fit himself in the secret passage.
 * In "Put That Putter Away", due to Perry being tired, both his entrance and the singers sound sleepy.
 * In "Oh, There You Are, Perry", Perry's theme song is used as a musical access code, played out when Perry steps on the stones in the yard.
 * In "The Chronicles of Meap", Perry's anthem begins playing as he approaches a lair entrance, but when he comes across Meap, he hides his hat and the music stops. Meap and Perry have a "conversation" ("Meap!" "chatter" "Meap!" "chatter" "Meap!"), then Meap walks away. Perry puts his hat back on and the music continues from where it started.
 * In "Phineas and Ferb's Quantum Boogaloo", the song is played very slowly and has a big gasp between it, like sung by old men, because Perry is very old.
 * In "Phineas and Ferb's Musical Cliptastic Countdown", the song is sung by the studio audience.
 * In "Isabella and the Temple of Sap", Perry does not have a B-plot, but it is revealed that Pinky the Chihuahua's theme song even as an agent is mariachi band music.
 * In "Atlantis", Perry goes to the deck and there's a Man using a guitar and singing "Dooby Dooby Doo-Wah".
 * In "Phineas and Ferb Christmas Vacation!", the "Dooby Dooby Doo-Ba" is replaced with a more festive "Fa-La-La-La-La-La", as taken from the Christmas carol "Deck the Halls".
 * In "Suddenly Suzy", Carl plays the tune with his single facial hair. Major Monogram found it disgusting and fascinating at the same time.