A Jack Russell terrier, and one of the two protagonists of the movie. He is quite fun-loving but is somewhat possessive of his owner when Duke comes along.
- Accidental Murder: He and Duke end up killing The Viper
- Adorkable: His affection towards Katie can make him pretty endearing
- Amazon Chaser: He starts to reciprocate Gidget's feelings for him after he sees her effortlessly take down the entirety of the Flushed Pets right in front of him.
- Bullying a Dragon: To Duke. From the very beginning, he's prone to try and push the other dog around, despite the fact that he's literally bite size to the latter.
- Crush Filter: Max suddenly sees Gidget with all new eyes when she opens the can of whoop ass on the Flushed Pets.
- Green-Eyed Monster: The plot is set into motion when Katie adopts Duke and brings him home. Given that his whole life virtually revolved around his owner, Max becomes bitter and suspicious of the new dog, and initially tries to get rid of him.
- It's All About Me: Initially.
- Jerk with a Heart of Gold: While he can be a bit egotistical, he's a nice guy once you've gotten to know him.
- No Good Deed Goes Unpunished: When he tries to reunite Duke with his previous owner, it backfires spectacularly.
- Oblivious to Love: As shown in their first interaction in the film, Max is so focused on his owner's return that he's oblivious to Gidget's overly flirtatious mannerisms.
- Shown Their Work: Max's initial reaction to Duke is spot on for how a pet dog will react to the sudden introduction of a new animal into the family home. Especially when the new pet is considerably larger and the dog feels threatened. Pet shelters unanimously agree that the way Katie handled the situation was among the worst ways. She's lucky Max and Duke didn't wind up grievously wounding or killing each other considering she left them unattended for an extended period of time.
- Undying Loyalty: To Katie. At the beginning of the movie, he unblinkingly announces his intent to stand by the door to their apartment until she comes home.
- Unwitting Instigator of Doom: Literally, this entire movie wouldn't have happened if he just hadn't been a dick towards Duke.
- What the Hell, Hero?: Gives one of these to Duke after he accuses Max of trying to get rid of him when trying to reunite him with his original owner (who they had just found out at the moment just died).
- Voiced by: Eric Stonestreet
A large, brown, shaggy Newfoundland and the other protagonist of the movie. He is at first reckless and inconsiderate, but is later shown to have a sympathetic backstory.
- Accidental Murder: He and Max end up killing The Viper
- Berserk Button: Anything related to Animal Control, and often cats.
- Beware the Nice Ones: He's a friendly dog who wants to get along with Max and can get really angry with him if Max started to fight with him or when he assumed Max tries to get rid of him after they discovered that Duke's previous owner already passed away.
- Big Eater: He eats his big mixing bowl of food and then Max's terrier-sized portion (although that was while he was making a power play) and an enormous amount of sausages.
- Dark and Troubled Past: His original owner, who had adopted him as a puppy, but never came for him after he was taken by Animal Control.
- Fire-Forged Friends: With Max.
- Gentle Giant: Under normal circumstances, he's a very loving dog.
- Jerk with a Heart of Gold: He only acts like an asshole when you've gotten on his nerves.
- Never My Fault: He accuses Max of trying to get rid of him when he tries to reunite Duke with his original owner, only to find out he just died. However, Max isn't at fault here because he was just trying to do something nice for Duke at the moment with no ill intention and he wouldn't have tried to do that had Duke not told him about his original owner. Thankfully, Max calls him out on it.
- Nice Guy: More outgoing than Max and willing to get along with every pets.
- "Shaggy Dog" Story: Ironically. Turns out the reason his owner didn't come for him is that said owner died, and Duke only found out when he and Max made it to the house where he used to live, and were greeted by a cat.
- You Won't Like Me When I'm Angry: When Max starts grumbling about him, Duke looms over him menacingly and says that if they don't get along, it won't be pretty.Duke: Man, are you making me angry! And when I get angry, I do this! [growls] And I don't like doing that! I need this place! And if it's gonna come down to you or me, it's gonna be ME!
- Voiced by: Kevin Hart
A white rabbit. After he was abandoned by his magician owner, he went crazy, and leads a pack of other abandoned pets plotting to take revenge on humankind, deep down in the sewers.
- Affably Evil: His burning hatred for humanity aside, Snowball is quite pleasant and likeable when he's in a good mood.
- Anti-Villain: In a way. His wrath against mankind is justified, he just takes it a little too far. Despite his anger issues, he also has enough altruism to care about his comrades, even if they were enemies before.
- Ax-Crazy: He is quite a psycho.
- Big Bad: Of the movie until his HeelFace Turn.
- Big-Bad Ensemble: With the dog catchers until they capture his goons and Morality Pets, at which point Snowball does an Enemy Mine.
- Big Damn Heroes: He's the one who saved Max and Duke at the end.
- Bitch in Sheep's Clothing: As he says in some of the ads, cute is just his cover.
- The Cameo: He makes a surprise appearance in the Illumination logo for The Grinch.
- Cute and Psycho: A cute but crazy bunny.
- Cute Is Evil: Wook at the cute widdle wabbit! Isn't he adowa—OH GOD, MY FACE!!!
- Enemy Mine: He teams up with Max in order to save Duke and three of his goons.
- Even Evil Has Loved Ones: His goons.
- Even Evil Has Standards:
- He has a strong dislike of the dog catchers.
- While he is technically mourning, even he realized The Viper probably did some horrible things while still alive.
- Fantastic Racism: He hates domesticated animals. This changes after he becomes one himself.
- A Father to His Men: One of his few redeeming qualities before his HeelFace Turn is that he treats all his goons with respect. In fact, his HeelFace Turn was so that he could save 3 of them.
- Freudian Excuse: He was once a magician's rabbit, until rabbit tricks went out of style, whereupon his owner abandoned him.
- Good Feels Good: Says this after rescuing Max and Duke
- Hair-Raising Hare: Duh.
- Hair-Trigger Temper: He makes death threats with relative frequency.
- HeelFace Revolving Door: In spite of his HeelFace Turn, he's got a long way to go to redeem himself.
- HeelFace Turn: He ends up helping Max in the end and gets a new owner, changing his previous perspective of Humans.
- Humans Are Cthulhu/Humans Are the Real Monsters: The entire reason he leads the group of flushed animals is his belief that Humans are no good and will abandon their pets. This all changes after his HeelFace Turn.
- It's Personal: At first, his hatred towards Max and Duke is due to them being pets. It later becomes this trope after they accidentally kill The Viper.
- Jerk with a Heart of Gold: When you're on his good side.
- Karma Houdini: In spite of all the trouble he brought onto the main characters and causing God knows how many deaths with his driving skills, he ends up getting a home at the end.
- Killer Rabbit: His introductory scene is right out of Monty Python and the Holy Grail, with the only difference being that he (unfortunately) doesn't actually rip the guy's throat out.
- Large Ham: You could tell Kevin Hart was having a blast voicing Snowball.
- Light Is Not Good: The white rabbit is quite ill-tempered.
- Meaningful Name: He shares his name with Snowball from Animal Farm. Both characters are animals that want to revolt against humans.
- Misanthrope Supreme: His entire revolution has the intent on doing some serious harm to the humans of New York and "liberating" their pets.
- Morality Pet: His goons. The moment you mess with them, he'll make you pay the hard way.
- Not Evil, Just Misunderstood: He's less evil than he makes out to be, and appears to be just lashing out after being abandoned more than anything else (coupled with some very manic mood-swings). Notably, it takes all of fifteen seconds of being hugged and squee'ed over by a little girl who wants to adopt him for his anti-human resistance plans to completely dissipate.
- Pint-Sized Powerhouse: He could be the new poster boy for this trope.
- Strong as They Need to Be: In his first scene, he effortlessly beats up an animal control officer. But when he attacks Max later on, Max barely even feels his blows. Nor does the little girl who adopts him when he initially resists.
- Villain Has a Point: While his hatred of all humans isn't Justified, his hatred of his former owner and the dog catchers is.
Max's Search Party
- Voiced by: Jenny Slate
A white Pomeranian who has romantic feelings for Max. She leads the pets to find Max and Duke.
- Action Girl: An adorable Action Pet who knows how to kick some animal ass.
- Badass Adorable: Max's disappearance really brings out the Determinator in her. To the point where she smacks the living tar out of Ozone for information, and clobbers ALL of the Flushed Pets when they attempt to kill Max on the Brooklyn Bridge.
- Beware the Nice Ones: "I'M DONE PLAYING NICE!"
- Curb-Stomp Battle: Gidget: 1, Flushed Pets: 0.
- Determinator: Will go through everything and anything to rescue Max and bring him home.
- Earn Your Happy Ending: Her undying dedication to searching for Max and protecting him from Snowball and his minions pays off when he returns her feelings for him at the end. Of course she had to fight off Snowball's army before he even really notices her.
- Nice Girl: Sweet-natured and affectionate.
- Nice Job Breaking It, Hero!: She accidentally gives away Max's name to Snowball (who only referred to him as "Tiny Dog" till that point), which now makes him aware of the identity of his target.
- Ojou: She lives in a fancy apartment and is pampered like a princess.
- One-Woman Army: The Flushed Pets had no idea what awaited them.
- Pink Means Feminine: Wears a pink bow on her head.
- Pintsize Powerhouse: This tiny Pomeranian? She can deck an army of pets.
- Plucky Girl: The one who assembles Max's Search Party, and is totally prepared to go rescue Max without additional help.
- Spoiled Sweet: Her owners spoil her, and she's a very kind and caring dog.
- Suspiciously Specific Denial: She emphasizes that she doesn't care about Max more than as a friend and she really doesn't care if his new roomate is a girl or a boy, without being prompted. He's too wrapped up in his own troubles to notice, though.
- Undying Loyalty: To Max.
- Violently Protective Girlfriend: Downplayed as she's not technically his girlfriend (though she hopes to be), Gidget trashed the Flushed Pets' asses when they were about to kill Max.
- Voiced by: Lake Bell
An obese and apathetic grey domestic short-haired cat, and one of Max's friends.
- Artistic License Animal Care: She eats cakes. That's not something a cat should be able to do without a serious stomachache at best and life-threateing indigestion at worst.
- Big Eater: She eats an entire roast chicken and a cake.
- Butt-Monkey: More than anyone else in the movie, she has her dignity repeatedly destroyed, most notably when she ends up on YouTube.
- Cats Are Mean: Downplayed to "Cats Are Snarky Jerks With Hearts Of Gold"; she's a bit aloof, cutting and haughty and states to Max's face that she doesn't care about him or his problems, but she clearly cares more than she lets on.
- Cats Are Snarkers: She makes sarcastic comments towards Max and about the rescue mission for the whole film.
- Expy: She's more or less a female Garfield.
- Fat Bastard: She's a Fat Cat and rather cold.
- Fat Cat: In a similar vein to Garfield.
- The Hedonist: Her Establishing Character Moment is her attempting to resist (and eventually succumbing to) her urge to eat an entire roast chicken. And then repeating the process with a cake.
- Hypocritical Humor: She rolls her eyes at the dogs obsessing over the green ball, then goes nuts the second she sees the dot from a laser pointer.
- I Meant to Do That: She's actually quite clumsy and prone to accidents and embarrassments, as most obviously demonstrated with her calamity with the buffet at the party. As with all cats, her typical reaction after the fact is haughty nonchalance and acting like nothing untoward happened at all.
- Jerkass Has a Point: While she is being a dick about it, she is right when she says that Max's problem with Duke is something that is none of her concern. Her advice that Max needs to stand up for himself and assert that he's the "alpha" if he doesn't want Duke to bully him into submission in his own home is also not without merit.
- Jerk with a Heart of Gold: She claims not to care about Max's problems and once tried to eat Sweet Pea, but she's the first one to go along with Gidget's call to action. She also convinces the others to come along by pointing out how Max has helped them all in the past.
- Not So Above It All: Like any cat, she affects an air of aloof dignity. Like any cat, she goes completely to pieces when startled and bounces across the entire buffet at Pops' party. Which is then broadcast on Youtube.
- Odd Friendship: Despite her snarking that she doesn't care about Max or his problems, of the gang we follow they seem to be each other's best friend.
- Slapstick Knows No Gender: See Butt Monkey, above.
- Tsundere: She goes out of her way to pretend that she doesn't care about Max, but she's the one who gets everyone on board with saving him. And when her owner gets home, she spends a bit of time being moderately annoyed with her and even biting her finger before licking her, but can't quite conceal a fond little smile when she gets hugged.
- Voiced by: Albert Brooks
A sardonic red-tailed hawk who helps Gidget find Max.
- The Atoner: The reason he helps Gidget is to make-up for trying to eat her.
- Chuck Cunningham Syndrome: Nowhere to be seen in the sequel.
- Deadpan Snarker: Has his moments.
- Everyone Has Standards: He refuses to eat Ozone for being "too ugly".
- Freudian Excuse: He justifies his attempt to eat Gidget with the fact that he was "born with killer instincts".
- Freudian Slippery Slope: "Come here, small food... I mean friend." Attempts to correct himself just make it worse.
- HeelFace Turn: In his first scene, he tricks Gidget into letting him out of his cage so he can try to eat her, but the attempt is foiled by the chain around his foot. He regrets his actions after Gidget scolds him, and, following her removing the chain, he never tries to eat her again.
- I Just Want to Have Friends: After his failed attempt to eat her, he confesses to Gidget that he's very lonely, and that no-one will be his friend because they're afraid he'll eat them. One wonders why...
- Imagine Spot: After Gidget promises to be his friend in exchange for finding Max, Tiberius fantasizes about flying through the city with her on his back. And then both of them laughing maniacally as they swoop down on a luckless squirrel.
- Noble Bird of Prey: He's a red-tailed hawk. While not exactly noble, he at least acknowledges his own shortcomings and helps the cast out.
- Pet the Dog: Not literally, but while he's mostly sarcastic and has a not-very-well-hidden urge to eat the smaller animals of the party, we see him at the end affectionately nuzzling his human owner when they're reunited.
- Reluctant Psycho: He really is lonely and wants friends, but when you're a bird of prey, it's just hard not to try eating small, fluffy things.
- Running Gag: He continually attempts to eat some of the smaller members of the group. Justified since even "domesticated" hawks have a habit of trying to eat small animals, as its hard-wired into their brains.
- Token Evil Teammate: While he does join the effort to find Max, Tiberius is barely able to prevent himself from eating Norman and other pets.
- Voiced by: Dana Carvey
An elderly Basset Hound, who is paralyzed in his back legs and helps Gidget and the pets find Max and Duke.
- Abhorrent Admirer: He makes flirty comments at Chloe which disgust her.
- Accidental Misnaming: He calls Chloe "Rhonda", for some reason.
- Cool Old Guy: He's an aged Basset Hound who takes advantage of the fact that his owner is rarely home by making his apartment into a local hot spot where pets are free to come in and party as they please. At one point, he gets hit off a wooden plank by by metal beam over dozens of feet above the ground and makes back up in a pipe without a scratch.
- Dirty Old Man: His comments towards Chloe seem to imply this.
- Gallows Humor: When asked how he is, he replies "Paralyzed." Later he hurries them up by saying that for him, every breath is a cliffhanger so they'd better move it.
- Grumpy Old Man: Initially, though he quickly warms up to the group.
- Handicapped Badass: Despite his paralysis, Pops does manage to lead the search team into the sewers, which involves crossing some dangerous (and high up) sections of New York.
- Interspecies Romance: He becomes smitten with Chloe, to the point of referring to her as his girlfriend. Needless to say, the cat does not reciprocate.
- Old Friend: Of Buddy's.
- Screw Politeness, I'm a Senior!: His motto.
- Voiced by: Bobby Moynihan
A hyperactive Pug and one of Max's friends.
- Voiced by: Hannibal Buress
A laid-back Dachshund and one of Max's friends.
- Voiced by: Tara Strong
A small parakeet and one of Max's friends.
- Cross-Dressing Voices: Tara Strong once again voices a male character.
- Face of a Thug: His owner.
- Nearly Normal Animal: Unlike the other animals, he doesn't appear to talk.Ironic, considering he's a parrot.
- Noodle Incident: Chloe once tried to eat him before Max somehow stopped her.
- Silent Snarker: He often gives deadpan faces.
- The Voiceless: He's the only animal of the group who doesn't talk.
- Voiced by: Chris Renaud
A guinea pig who keeps getting lost trying to find his apartment.
- Creator Cameo: Renaud is the movie's director.
- The Ditz: He is clearly shown not to be the sharpest tool in the shed among the search party
- FaceHeel Turn: Has a short one after he briefly joins The Flushed Pets. Although given his general lack of smarts and amiability, it seems to be based more on a lack of understanding of precisely what's going on combined with his just being friendly and sociable more than anything else.
- Earn Your Happy Ending: He finally succeeds in heartwarming fashion at the end of the movie, much to his owners joy.
- Screw This, I'm Out of Here!: He abandons the group after Gidget blows their cover to the flushed pets. He ends up getting catched by them anyway and joins them.
- Too Dumb to Live: His tendency to get lost in the wrong pipe often gets him in trouble, such as when it causes him to come face to face with a flushed Sewer Gator.
- With Friends Like These...: He is shown laughing along with the Flushed Pets at Max right before they're about to attack him for supposedly attacking Snowball. Although in his defence, given his general amiable nature and lack of smarts he seems to be just genuinely pleased to see Max while not fully understanding exactly what's going on.
- Voiced by: Ellie Kemper
A kindhearted human girl and Max and Duke's owner
- Ivy League for Everyone: Early on, she is seen in the bathroom wearing a Dartmouth shirt. Certainly justifiable as her apartment and furnishings implies a fairly well-paid job.
- Nice Girl: She's a very kind an loving soul, adopting both Max and Duke, at different times, purely because she couldn't stand to see them in the pound.
- The Pollyanna: She is always expecting the things she does to have the best possible outcome. The way she introduced Duke to Max could have turned out much, much worse than it did.
- Reasonable Authority Figure: When she got home and saw her house trashed due to Max and Duke's actions, rather than berate Max and Duke, she quietly thanked whatever deity she believes in that things weren't worse, and Max and Duke are apparently okay with each other, and have worked out their issues.
Duke's old owner
The Flushed Pets
- Voiced by: Michael Beattie
A dull-witted domestic pig and one of Snowball's chief enforcers.
- Freudian Excuse: This pig is quite correct to be angry and resentful that his only purpose as a pet was to be a practice dummy for tattoo artists until he ran out of space, where he was summarily abandoned.
- Let's Meet the Meat: Although he doesn't want to be eaten, many of his tattoos are reminiscent of this trope, as they map out the location of pork chops, ham and bacon on his body.
- Tattooed Crook: He has tattoos. The fact that "Tattoo" is his name should definitely tell you something.
- Voiced by: 'Steve Coogan
A hairless Sphinx cat who Max and Duke encounter in the alley.
- All There in the Manual: His name is never said in the film.
- Bald of Evil: A hairless Sphinx cat and on the side of evil.
- Cats Are Mean: If you are one of the Flushed Pets, it is a given.
- Evil Brit: He is voiced by Steve Coogan after all.
- For the Evulz: He outright destroys Max and Duke's collars, confiscating their tags for no real reason, and then summons an army of feral cats when Duke complains, all of whom absolutely torment both dogs until Animal Control shows up.
- Jack Bauer Interrogation Technique: All Gidget had to do was slap the shit out of him to find out what happened to Max.
- Too Dumb to Live: Tiberius sums it up best.Tiberius: He's too stupid to talk, and too ugly to eat!
- Too Spicy for Yog-Sothoth: Tiberius refuses to eat him for being "too ugly".
- What Happened to the Mouse?: We never find out what happened to him after he told Gidget and Tiberius where Max went. Then again, he is seen in a mid-credits scene at a party at Leonard the Poodle's apartment, so it's safe to assume that Gidget and Tiberius let him go after learning of Max's whereabouts.
A massive, one-fanged snake who initiates new recruits into the Flushed Pets by biting them.
- Accidental Murder: Courtesy of Max and Duke.
- Asshole Victim: Even Snowball admits it.
- Eye Scream: He has a blind left eye.
- Forgotten Fallen Friend: By the end of the movie, everyone has completely forgotten he even existed.
- Kill It with Fire: How he dies.
- My Death Is Just the Beginning: His death is what makes Snowball go after Max and Duke.
- Rasputinian Death/No Kill Like Overkill: He gets crushed by some falling ceiling debris but emerges unscathed... and then is crushed by a larger pile of debris. And then a huge chunk of brick wall. Which then spontaneously catches fire.
- Reptiles Are Abhorrent: He is one of the Flushed Pets.
- Sacrificial Lamb: A villainous version.
- Walking Spoiler: Simply knowing his name gives a lot of spoilers.
A male duck who was a member of the Flushed Pets before dying prior to the events of the film. According to Snowball, he was the only member of the Flushed Pets who would kill humans on sight.