Eric Tiberius Duckman
- Voiced by: Jason Alexander
The title character, Duckman is a perverted and angry private detective who is bitter over the death of his wife.
- Anti-Mentor: "Das Sub" has Duckman sentenced to community service where he ends up as substitute teacher for a bunch of honor students. Duckman chastises them for being focused on school work instead of learning to survive in the real world. After taking them out on the town for his kind of experiences and nearly sending them sent to jail, the students admit he did teach them some valuable lessons—not the least of which was to never be like him.
- Anti-Role Model: Depending on the Writer, Duckman will often stand in for the worst humanity has to offer. It reaches parody levels when he steals a soda can from a vending machine in "Ajax and Ajaxer".Duckman: Why, I bet a kid, thinking I was a role model and wanting to imitate my behavior, could easily steal sodas from a vending machine, too. DO IT! DO IT NOW, KIDS! STICK IT TO THE MAN!
- Bad Liar: In "The Gripes of Wrath," Bernice discovers Duckman has tickets to Busty Bikini Babe Fest, which leads to this:Duckman: It's not like it sounds! First prize is a scholarship, or, uh... something.
- Bed Trick: One of the only women he's been with in a long time was a blind, Seinfeld-obsessed woman who thought he was Jason Alexander in a duck suit.
- The Berserker: No matter where he is, what's his mood or whenever he has done anything at all, Duckman will always be bothered by something.
- Brilliant, but Lazy: Often both at once. One time, he had an IV hooked up to his arm and directly poured his morning coffee into it.
- Butt-Monkey: Like you have no idea.
- Calling the Old Man Out: Charles, Mambo and even Ajax occasionally aren't exactly proud of their father and will call him out whenever he does or says something ignorant, stupid, selfish, dangerous or ill-conceived.
- Casanova Wannabe: Just a total sleazebag who couldn't put the moves on a woman if his life depended on it.
- Catchphrase: "What the hell are you starin' at!?" And when he's surprised, "Dwah!" And when he sees a hot lady, "Humina-humina-ha-wah!"
- Chivalrous Pervert: To Beatrice when they were married. And to any woman he ever dated: Angela and Honey, included.
- Clueless Detective: The number of cases he's actually solved without Cornfed's help could easily be counted on one hand.
- A Date with Rosie Palms: Frequently, since he rarely gets any.
- Deadpan Snarker: Whenever he's not shouting his snark at the top of his lungs.
- Determined Defeatist: He's constantly surly, depressed, and annoyed with his life, but he explicitly states he keeps going out of some hope that if he keeps going his life will get better somehow.
- Embarrassing First Name: To him, anyway. Eric. It gets to the point where only Beatrice knew about it.
- Eye Glasses: His eyes are actually attached to his glasses. When he takes them off, he's literally Blind Without 'Em.
- Fiery Redhead: He has red-orange hair. See Hair-Trigger Temper and The Berserker for the "Fiery" part.
- Freudian Excuse: See Hilariously Abusive Childhood below. Beyond that, his life is just a never-ending corridor of torture which he continuously lampshades.
- Funny Animal: Lampshaded in "Forbidden Fruit" when he's ostracized by society."I am not an animal! I AM NOT AN ANIMAL! Well, okay, I'm kind of animal. I mean, a few of my features are animal-like, and I don't wear clothes, and I smell a little outdoorsy most of the time. But I have a job, and I talk and stuff, too, so when I say I'm not an animal, I think technically I'm on solid ground."
- Grumpy Bear: Duckman's grouchiness is one of his defining characteristics.
- Hair-Trigger Temper: Sometimes it seems like everything pisses him off.
- Happily Married: Duckman's relationship with Beatrice, until she died. Duckman's still affected by it and continues to mourn her for years after her supposed death.
- Happy Dance: "You put your down, down. You thrust your pelvis, huh! You thrust your pelvis, huh!"
- The Hedonist: Duckman lives for his pleasure, first and last. Most of his activities are him indulging in one of his vices.
- Ethical Hedonist: When he cares enough, which is rare.
- Heterosexual Life-Partners: With Cornfed.
- Hidden Depths: In "Joking the Chicken", turns out its his speech about how comedy needs to be offensive wasn't a result of the intelligence potion.
- Hilariously Abusive Childhood: His mother constantly neglected him in favor of sleeping around with multiple men in a mournful attempt to find a replacement for Duckman's father after his death and he never really had a true father figure.
- Additionally, he was bullied when he was little and often used King Chicken as a scapegoat to spare himself for a moment.
- He recalls in "Cellar Beware" how he was caught stealing candy as a child. His father had the police chief put him in a jail cell to teach him a lesson. However, the chief hit his head fifteen minutes later and became comatose. Since no one else knew why he was there, Duckman was stuck in the cell for sixteen months, still sadly believing his father would come for him and cared for him.
- Jerkass: His abrasive attitude is the cause of most of the plots of the show.
- Jerkass Has a Point: More often than not, his rants will have some truth in them.
- Jerk with a Heart of Gold: He has his moments where he makes it clear that he does love his kids and want the best for them, and is able to think of others before himself.
- The Lost Lenore: His beloved wife, Beatrice. When she died, a part of Duckman died with her. Making matters worse, Bernice is her twin sister, so every day he comes home to someone who looks like Beatrice but treats him like shit.
- Motor Mouth: About a mile per minute.
- Narcissist: High opinion of himself, caters to his own appetites first, often forgets about the necessities of other, his family included; sincere, if selfish concern for his closest peers? Yes, Duckman is this trope through and through.
- No Indoor Voice: If he feels like it, he's gonna say it. Whether or not anyone is paying attention, is another issue.
- No Respect Guy: None, whatsoever. Even when he actually solves a case or saves the day, he still get yelled and cursed by the people around him.
- OOC Is Serious Business:
- How do you know saying goodbye to his boys in "The Amazing Colossal Duckman" is serious? Duckman remembers Mambo's name.
- When he genuinely falls in love with a woman, almost all of his negative traits vanish and he becomes more self-aware.
- Only Friend: With Cornfed.
- Papa Wolf: When he isn't neglecting his kids, he can be this.
- Parents as People: He's perverted, loudmouthed, bad-tempered, and an equally bad role model for his kids, yet at the same time he genuinely loves them and tries to be the best father they ever had. He also suffers chronic depression from the death of his wife, Beatrice.
- Parental Incest: Hinted at in "Role With It", when he says that therapists forced his mother to stop bathing with him when he was 15.
- Parental Neglect: He often can't remember Mambo's name, and usually wants nothing to do with them. The only time he seems to want to be with them is when they don't want to be with him.
- Private Detective: His daytime job. Not that he is pleasant... or does a good job... or is particularly competent... or cares to show up half of the time. Bottom line: never hire this guy.
- Screams Like a Little Girl: Literally. When he needs to scream in a panicked state, they splice in stock audio of a girl screaming.
- Small Name, Big Ego: That's why his family needs to keep him in check.
- Sour Outside, Sad Inside: Never really got over the loss of Beatrice.
- Unsympathetic Comedy Protagonist: Zig-Zagging Trope. Duckman's an asshole, a bad friend and an even worse father who probably deserves everything that happens to him. But when the show puts him under a microscope, he's shown to be a lonely, desperate and pathetic guy who has lost the few things he holds dear and is the Butt-Monkey of the world.
- With Friends Like These...: He causes his best friend no end of trouble and embarrassment.
Willibald Feivel Cornfed
- Voiced by: Gregg Berger
Duckman's detective partner, a deadpan pig who is able to do just about everything imaginable.
- The Ace: Cornfed is able to do pretty much anything, and is almost always the one to solve Duckman's cases. If he's ever in trouble, it's usually Duckman's fault.
- All Men Are Perverts: Zig-zagged. Even someone as stoic as Cornfed can be aroused by an attractive woman, but he's just too bashful to have sex, even with women who practically throw themselves at him.
- Beleaguered Assistant: Duckman often treats Cornfed like crap and tries to take all the glory, when in reality it's Cornfed who solves every case.
- Brilliant, but Lazy: He's brilliant and has all sorts of skills, yet he works as Duckman's sidekick.
- Butt-Monkey: For Duckman.
- Celibate Hero: He's never had sex (until "Pig Amok" with Bernice, whom he only has sex with because if he didn't, he'd die). Cornfed is seemingly too much of a gentleman to go through with having sex with any of the girls he meets. There are several points in which it looks like he's had sex, but it's always handwaved in a later episode that they didn't.
- Chessmaster Sidekick: Not that it takes much to out-think Duckman to begin with.
- Chick Magnet: Cornfed can potentially charm the pants off any woman he comes across, but with that being said, he's never had sex until Bernice. Even after he loses his virginity, he still avoids having sex until he's married.
- Deadpan Snarker: You would be too, working under Duckman.
- Embarrassing First Name:Duckman: Willibald Feivel!? AHAHAHAHA!
- Forgotten First Meeting: "The Girls of the Route Canal" parodies this. In his search for Beatrice, Duckman bumps into Cornfed, at the time a baggage handler in New York. Cornfed keeps trying to help out and talk, but an oblivious Duckman keeps yelling at him to shut up.
- Heroic Self-Deprecation: It's implied multiple times throughout the series that Cornfed suffers from critically low self-esteem, longing for a purpose in life which is manifested in his multiple exploits. Not to mention his anxiety over being a virgin for much of the show despite being well into adulthood. It wasn't until he met Duckman and started working for him that he found his life's true calling.
- Heterosexual Life-Partners: With Duckman.
- Hypercompetent Sidekick: It's a wonder he even bothers working under anyone.
- Informed Judaism: There are a couple times in the series where Cornfed goes to funerals wearing a borsalino hat and payot. Ironically, he is a pig.
- Multiple-Choice Past: The show gives several scenarios in which Duckman meets Cornfed for the first time. In one, he takes a bullet for Duckman, saves him from choking, then takes another bullet for him. In another, they knew each other in high school. In yet another, Cornfed drove Duckman from New York to Beatrice's house in order to reunite the two.
- No Celebrities Were Harmed: His voice and personality are a parody of Jack Webb's character, Joe Friday.
- Noodle Incident: The final episode reveals he knew all along that Beatrice was still alive. He insists he can explain just ahead of To Be Continued.
- Not So Above It All: He enjoys a good crude joke every so often and sometimes even laughs at Duckman's snappy quips.
- Only Friend: With Duckman.
- Seen It All: Cornfed has seen and done a great many things throughout his life, and he'll usually bring something up from his past to explain how he's able to do amazing things as a detective. For example, he fought in The Vietnam War, was a member of Irish parliament, played Jimi Hendrix in Legends on Ice, has a medical degree from a Peruvian university, and wrote a book on how to be a mailman.
- Ship Tease: With Beverly. They get married in the last episode.
- Suddenly Always Knew That: Cornfed is often suddenly put in situations that call for him to have some complicated skill, anything from playing the piano to performing medical examinations. He's always prepared, and always has a story from his past on how he has this knowledge.
- Taking the Bullet: For Duckman. Twice. And he didn't even know him in that explanation of how he met Duckman.
- Undying Loyalty: Duckman treats him like crap most of the time, and sometimes Cornfed will go against him, but Cornfed will always come back to Duckman, which says a lot, since he's qualified to do literally anything else.
Bernice Florence Hufnagel
- Voiced by: Nancy Travis
Duckman's sister-in-law who hates him with a passion. She became the primary caretaker of her nephews Ajax, and the twins Charles and Mambo, when her sister Beatrice granted her both joint custody of her children, and the deed to her house before her death. She is a fitness fanatic who is almost always seen exercising, and unlike her relationship with Duckman, she adores her nephews.
- Acronym and Abbreviation Overload: Invokes this in "They Craved Duckman's Brain".Bernice: I'm going to call our congressman and get that S.O.B. to rouse the F.D.A, H.E.W., D.O.J., and every other V.I.P. in D.C. ASAP!
- Aw, Look! They Really Do Love Each Other: On occasion an episode will show that she does indeed care for Duckman, for all his faults.
- Butch Lesbian: Subverted. She becomes attracted to Regine Poulet in "Forbidden Fruit" and is incredibly relieved to find out "she" was actually King Chicken Disguised in Drag.
- Covert Pervert: She's more subtle about it than Duckman but she can sometimes be just as sex-crazed as him, and she's a fan of corporal punishment among other things.
- Double Standard: Abuse, Female on Male: Zig-zagged. Duckman often deliberately antagonizes her, which warrants an ass-kicking or two to keep him in line. But she also does go a little overboard with her abuse at times, especially when she's doing it solely to screw Duckman over or get him killed.
- Hidden Depths: It's hinted at in the show, and strongly hinted in the comics, that she's actually attracted to Duckman, and that she sees what her dead sister saw in him. This causes her to lash out at Duckman even more than she normally would.
- Jerkass Has a Point: For all of her domineering, belittling, and violent behavior towards Duckman, her points about him being a sleazy, deadbeat father are valid, what with his usual behavior.
- Long-Lost Relative: Beverly is her and Beatrice's long-lost triplet sister.
- Mama Bear: Brash, bitter, obnoxious, and loves the kids to death.
- Not So Above It All: Despite her repeated protests against Duckman's perverted behavior, Bernice is often just as desperate for a partner as he is and isn't afraid to lower her standards and morals.
- Not So Different: With Duckman; she can be crude, perverted, and bad-tempered as him, except she's more restrained about it. Duckman himself believes that for all their Sibling Yin-Yang, Bernice is a lot like Beatrice.
- Parental Substitute: For Ajax and the twins, Charles and Mambo, ever since their mother (and Bernice's sister), Beatrice, died.
- Precision F-Strike: In "Research and Destroy", she lets loose on a snooty bouncer who keeps her and the family waiting in line for Ajax's performance, despite being family: After the bouncer makes a remark about fog, Bernice keeps saying "fogging" while yelling at the bouncer. So while not the actual "f" word, "fogging" sounds close enough.
- She's Got Legs: One of her most prominent traits are her shapely, muscled legs.
- Straw Feminist: She's prone to spouting anti-men rhetoric and is the first to complain on the subject of female rights, which she mainly just uses as an excuse to emasculate men. Predominantly Duckman.
- The Smurfette Principle: The only female in the main cast.
- Tiny Guy, Huge Girl: A duck woman who towers over the smaller Duckman.
- Tomboy and Girly Girl: The tomboy to Beatrice's (and later, Beverly's) girly girl.
- You Gotta Have Blue Hair: Has light blue hair, just like her triplet sisters Beatrice and Beverly.
- Voiced by: Dweezil Zappa
Duckman's first-born son, who is severely stupid.
- Ambiguous Gender: Well, he has a uterus.
- Big Eater: Often seen eating something, especially sandwiches.
- Dumb Is Good: The dumbest member of the family is easily the kindest.
- Establishing Character Moment: While "I, Duckman" establishes his stupidity immediately (he swallowed Bernice's stopwatch), it's the final scene where he talks to Duckman that establishes how kindhearted he is and how unusually profound he can be.
- Extreme Omnivore: He can eat literally anything he can fit in his mouth; he's eaten fecal matter (both human and animal) on several occasions. Not once has he ever suffered any ill effects.
- Genius Ditz: Ajax will occasionally say something intelligent, causing other to stare at him in Stunned Silence. This usually follows with him saying a complete Non Sequitur.
- Hidden Depths: "Research and Destroy" highlights his well-received poetry. "The One with Lisa Kudrow in a Small Role" reveals other interests: sculpting cheese, wanting to go to college, and that he's been secretly slipping extra cash into Duckman's wallet.
- Idiot Savant: Ajax is described as such when it comes to poetry.
- Incorruptible Pure Pureness: In the group therapy session from "Role With It," Duckman calls out the entire main cast on the ways they're mean-spirited, but he doesn't have a single negative thing to say about Ajax.
- Kindhearted Simpleton: Probably the most genuinely kind character on the show.
- Likes Older Women: Fell in love with his Vice Principal in "It's the Thing of the Principal."
- Meaningful Name: "The Girls of the Route Canal" reveals his name comes from the side of the truck that brought Duckman back to Beatrice.
- Missing Mom: His mother, Beatrice, died when he was very young. "Research and Destroy" shows that she is the inspiration behind his poetry.
- OOC Is Serious Business: King Chicken's plot in "Ride the High School" is to make Ajax too smart to relate to Duckman. Ajax slowly realizes what's happening when he speaks eloquently about a dandelion, leading him to scream.
- Parental Favoritism: Duckman favors Ajax over Charles and Mambo, because Ajax's lack of intelligence means that Duckman can relate to him. However, this doesn't mean much, as he still forgets his son's birthday and usually doesn't want to be around him.
- Singing Voice Dissonance: In "Vuuck, as in Duck".
- Surfer Dude: He has the accent of one, for example, calling his dad "Dod".
- You Gotta Have Blue Hair: Has blue hair like his mother, with a greenish tint.
Charles and Mambo Duckman
- Voiced by: Dana Hill (Charles, original voice), Pat Musick (Charles, "How to Suck in Business Without Really Trying" and onward), EG Daily (Mambo)
Duckman's second-born sons, who were born conjoined twins with two heads on the same body.
- Accidental Misnaming: Duckman would often get Mambo's name wrong, usually referring to him as another time of dance like Meringue or Macarena. On rare occasions, he doesn't even use a word starting with M.
- Aerith and Bob: Charles and Mambo (or whatever type of dance Duckman calls him that day).
- Conjoined Twins: Two heads on one body.
- Identical Twin ID Tag: Charles has lighter colored hair then Mambo.
- Insufferable Genius: They sometimes act like this.
- Like Father, Like Son: Despite their shared distaste for Duckman, they inherited most of his traits, like his Motor Mouth, bad temper, and penchant for insults.
- Missing Mom: Their mother, Beatrice, died when they were young.
- Multiple Head Case: They're two heads sharing a body and they sometimes get into arguments, which usually results in their whacking their own heads against each other.
- Mouthy Kid: They take after their Daddy in that regard.
- Single-Minded Twins: They can be.
- Strong Family Resemblance: They both resemble their father pretty closely, minus the eyeglasses.
- Teen Genius: They're very intelligent for their age.
- TV Genius: While not complete nerds, they do exhibit many shades of this.
- Twin Telepathy: They demonstrate this ability in "Bonfire of the Panties" during a ride in the car. It was probably a given since they share a body.
Sophia "Grandma-ma" Longnameovich-Hufnagel
- Voiced by: Nancy Travis
Duckman's mother-in-law, who is in a comatose state, only able to fart loudly.
- And I Must Scream: The comics stressed she's aware of what's going on around her. Once, when she was left at the altar, she cried in private afterward. Other episodes showed that she doesn't make expressions (somehow).
- Criminal Doppelgänger: Agnes Delrooney looks exactly like her.
- A Day in the Limelight: "Crime, Punishment, War, Peace, and the Idiot".
- Fartillery: She has done this many, many times, that it's pretty much the only way she can communicate. She can even fart in Morse code.
- Farts on Fire: Her farts have actually has been ignited a few times.
- Gasshole: All she's able to do is sit around and fart. Duckman in "I, Duckman" even calls her a potential fire hazard.
- I Was Quite a Looker: In flashbacks in "Crime, Punishment, War, Peace, and the Idiot" and in "Grandma-ma'a Flatulent adventure" Young Grandma-ma is actually very nice looking and polite especially when compare to how she looks and acts now.
- Obnoxious In-Laws: Downplayed, Duckman thinks of her as an inconvenience and, as we find out in one episode, she doesn't like him either (or that much, as the Klasky-Csupo website says she has a "soft spot" for him), though she was civil to him at his and Beatrice's wedding.
- The Speechless:
- With only a few exceptions, such as when her thoughts are audible or during her flashback in "Crime, Punishment, War, Peace, and the Idiot".
- In Grandma-ma's Flatulent Adventure: Not only do we hear Grandma-ma talking in the flashback but we also hear her inner monologue at the end of the episode.
Fluffy and Uranus
- Voiced by: Pat Musick
Duckman and Corfed's secretaries. A pair of stuffed bears who are overly-cute and nice and politically correct, who often end up being horribly and casually killed off by Duckman.
- Ambiguous Gender: In the episode "Exile in Guyville", all men and women are divided by a wall and those who are sexually confused become the guards, and the only two guards shown are Fluffy and Uranus.
- Berserk Button: They actually reach a breaking point with Duckman after he stays at their house in "Forbidden Fruit". He keeps them up all night, cooks their last-of-their-kind spotted finch eggs for breakfast, and completely trashes the place.Duckman: Look, these eggs need a little ketchup, is there anything else?(Beat)Uranus: As a matter of fact there is. Get the (Bleep) out of here, Mr. Duckman.(Beat)Fluffy: You deaf, Mr. (Bleep) cool!? Get the (Bleep) out of here before we tear your (Bleep) (Bleep) off and shove it up your (Bleep) (Bleep)!
- Butt-Monkey: Duckman always subjects them to horrific deaths and mutilations.
- Iron Butt Monkey: Keep coming back after every terrible, gruesome thing Duckman does to them.
- Leitmotif: An overly sweet music box-like tune plays almost every time they open their mouths.
- Political Correctness Gone Mad: The two of them are as politically correct as possible, which drives Duckman insane.Duckman: Suppose you're the chairman of a large-Uranus: Ah ah ah! Chairperson.Duckman: Suppose you're the chairperson of a large corporation that makes meat on a stick.Fluffy: Oh, Mr. Duckman, we couldn't support the killing of animals for food!Uranus: Nor the senseless slaughter of trees for sticks!Duckman: Okay. You're the chairpeople of a large, environmentally friendly corporation that produces wholesome apples. Now, you're supposed to prove that someone died of natural causes, what do you do?Fluffy: Are the apples free-range or are they grown in captivity?(Duckman throws them out the window where they get run over by a steamroller)
- Tastes Like Diabetes: Invoked example. They're nauseatingly sweet.
- The Dog Bites Back: When Duckman abuses their hospitality, they snap and give him a long, swear-laden rant before kicking him out.
- They Killed Kenny Again: Constantly killed by Duckman, but being stuffed, they always find a way to be put back together again.
George Herbert Walker 'King' Chicken
- Voiced by: Tim Curry
Duckman's arch nemesis, King Chicken wants Duckman dead for tormenting him in grade school.
- Big Bad: He's the only recurring villain on the show and is out to do everything he can to get even with Duckman for picking on him when they were kids.
- Bond Villain Stupidity: He leaves Duckman bound to a chair in "Joking the Chicken", promising to finish him off after the concert is over. Seems like he didn't expect the janitor.
- Crazy-Prepared: He reveals in "Color of Naught" that he secretly gave Duckman the antidote to his Beautex formula during dinner in "Forbidden Fruit" while disguised as the kids' nanny.King Chicken: Hey, you gotta think ahead in this business. By the way, here's an amulet I'd like you to wear.
Duckman: Wow, thanks.
- Cut Lex Luthor a Check: He creates impressive robots and other devices, all to get revenge on Duckman.
- Dramatic Unmask: Most of his appearances. "Forbidden Fruit" might be the crowning example, as he's wearing his other masks underneath his current disguise.
- Evil Mentor: To Iggy in "Joking the Chicken".
- Freudian Excuse: A super genius whose childhood trauma reduced him to thinking of ways to get revenge on Duckman and to take over the world.
- Hypocrite: He's enraged over Duckman doing anything with his wife, Honey. Never mind that he repeatedly cheated on her with Bernice, including earlier that evening.
- Master of Disguise: His main means of getting close to Duckman. However, genre-savvy viewers will be able to tell it's King Chicken because he doesn't usually change his voice for his disguises, and King Chicken is voiced by Tim Curry, who has a very distinct voice.
- Even in the case of the episode "Vuuck, as in Duck", the villain of the episode is voiced by Tim Curry but is never revealed to be King Chicken... until after the credits are over where he can be heard saying "I didn't get to peel off my head!" indicating that he actually was King Chicken.
- The only time when his voice is not used in a disguise is near the end of "Duckman: Legend of the Fall" when he perfectly disguises himself as Ajax, right to fully imitating his voice instead of using his usual voice.
- Motive Rant: After the first few times, his motives will be stated by everyone else around him in unison.
- Not So Different: Resents Duckman for his childhood torment and being made the most unpopular kid in school. "Cock Tales for Four" reveals that Duckman was also a frequent target of abuse, second only to King Chicken himself, and only teased King Chicken to be one of the guys instead of the punching bag, even if for a brief moment.
- Sitcom Arch-Nemesis: When he's not the Big Bad, he's this - on one level or another, he will antagonize Duckman.
- Strange Minds Think Alike: He and Bernice immediately hit it off due to having the same opinions on teaching and punishment.
- Villain: Exit, Stage Left: He frequently gets away after his scheme is thwarted. "Joking the Chicken" even has him say "Exit, stage left" as he makes his escape.
- Voiced by: Nancy Travis
- Covert Pervert: She wasn't nearly as perverted as Duckman, but she did have a few kinky habits, and she did enjoy Duckman's idea for erotic playing cards when they first met.
- Crazy-Prepared: Much as she loved Duckman, she stipulated in her will that Bernice gets part-custody of the kids. There was also fine print saying whoever can be the best provider gets sole custody.
- The Lost Lenore: While Duckman has no problem with ogling and making sexual advances towards women, it was because of Beatrice's death that Duckman was for a long time unable to get into a relationship.
- Morality Chain: Duckman himself notes in the first episode how Beatrice made him a better person.
- Not Quite Dead: The finale revealed that she's been alive this entire time, and for some reason, Cornfed knew about this and never told Duckman. However, the show was never greenlit for another season, and the many questions of how and why will likely remain unanswered.
Beverly Glenn Hufnagel
- Voiced by: Nancy Travis
- Composite Character: Can be as sweet as Beatrice and as snarky as Bernice when she needs to be.
- Covert Pervert: Much like her sisters she has a few kinks and it's implied she pleasures herself.
- Long-Lost Relative: Nobody knew that Bernice and Beatrice had another sister until she came along.Bernice: Do you know what it means?
- Only Sane Woman: Her general reaction to the other characters' quirks.
- Parental Substitute: While Bernice was busy as a congresswoman.
- Ship Tease: With Cornfed, much to Duckman's annoyance. They get married in the last episode.
Dr. Ben Stein
- Voiced by: Ben Stein
Duckman's neighbor, who is both a psychiatrist and a medical doctor, played by Ben Stein.
- The Danza: Named after Ben Stein, and played by Ben Stein.
- Deadpan Snarker: Though, he might not be this intentionally, as that's how his voice sounds
- Jewish and Nerdy
- Shiksa Goddess: Dr. Stein's wife, who is described as "the daughter of beautiful Gentiles."
Art De Salvo
- Voiced by: Gilbert Gottfried
A sleazy publicist and businessman. He eventually becomes one of Duckman's neighbors.
- Gold Tooth: He has one in "The Longest Weekend" and "How to Suck in Business Without Really Trying."
- Ink-Suit Actor: He appears to be a grotesque caricature of Gilbert Gottfried.
- No Indoor Voice: He switches between shouting and shouting very loud.
- Suddenly SHOUTING!: As expected from a character played by Gilbert Gottfried.
- Voiced by: Eddie Deezen
- Cannot Tell a Joke: His idea of "inoffensive comedy" isn't working out
- Don't Explain the Joke: He does this as well as being overly-politically correct.Iggy: Hi! I'm, uh, (Looks at wallet) Iggy Catalpa. I was checking my wallet like I forgot!
- Criminal Doppelgänger
- Eye Glasses
- Political Correctness Gone Mad: All of his jokes are this due to him trying to be as inoffensive as possible. He wises up at the end of his debut episode.Iggy: Well, I guess it's time to move on to my lesbian jokes. (Beat) Hey, whatever works!
- Voiced by: Brian Doyle-Murray
A notorious criminal who happens to look exactly like Grandma-Ma.
- Black Widow: When she looks at herself in a mirror, she remarks "No wonder all my husbands left me" before revealing that she actually killed all her husbands.
- Chained Heat: The second half of "You've Come a Wrong Way, Baby" is her and Duckman being in this situation.
- Criminal Doppelgänger: She looks exactly like Grandma-Ma, and her episode ends with Agnes staying undercover as Grandma-Ma while the real Grandma-Ma is jailed. This goes on for thirty or so episodes until "You've Come a Wrong Way, Baby", when the Duckman family is enslaved by an evil tobacco company, and Agnes decides to bust out along with Duckman.
- HeelFace Turn: Was a vicious criminal in her first appearance, but "You've Come a Wrong Way, Baby" shows she's mellowed out and grown to like Duckman and his family. She even got a pardon when it was all over.
- Twin Switch: Season 3's "Aged Heat" is built on this, as Agnes uses Grandma-Ma to escape during a robbery. The final twist is that the characters didn't actually send the right one to prison in the end. It's not until Season 4 is almost over that the situation is resolved.
- Voiced by: Kim Cattrall
A young, attractive blond woman who tried to become the mother figure of the Duckman family, but revealed herself to be a psychopathic murderer who kills any family that she views as imperfect.
- Ax-Crazy: She's a murderous psychopath.
- Bitch in Sheep's Clothing
- Evil Matriarch
- Nightmare Face: When her true nature is revealed, she sports some extremely frightening looks.
- Not Quite Dead: Parodied. She's seemingly killed and immediately returns to try to kill Duckman. He's saved by Bernice and Cornfed, who note awareness of how the psycho killer is never dead the first time.
- Stepford Smiler
- Uncanny Valley Girl
- Would Hurt a Child: She attempts to kill Duckman's entire family, his sons Ajax, Charles, and Mambo included.
Terry Duke Tetzlov
- Voiced by: John Astin
A sleazy businessman who provides services to the Duckman family, which usually end up backfiring.
- Call-Back: Whenever he shows up, the sleazy things he's done in the past will be brought up.Duckman: Hey, aren't you Terry Duke Tetzlov, the con man who almost killed me off with a defective home security system, buried my mother-in-law when she wasn't dead, and, uh, did that other bad thing?
- Honest John's Dealership: No matter what job he's doing, it's always poor-quality, sleazy and without a license.
- Karma Houdini Warranty: "Sperms of Endearment" is the only time he actually suffers for his sleazy ways: getting tormented by Duckman-like children.
- New Job as the Plot Demands: Characters will almost always point out all of his previous appearances when he shows up.
- Voiced by: Robert Klein
The last of Duckman's blood relatives, not counting his kids. He's an even bigger jerk than Duckman himself, and in his last days, decides to take advantage of a family curse in order to exploit and torture Duckman as much as he can.
- The Dreaded: His arrival causes Duckman to have horrible, nightmarish visions and is played as an abusive Knight of Cerebus for Duckman.
- Escape Artist: Duckman captures him in a burlap sack, chains him up, locks him in a trunk, and chucks him down into the basement, and he escapes seconds later. He explains that he's pissed off so many people that he gets tied up and locked in trunks all the time.
- Evil Counterpart: Uncle Mo's essentially what Duckman would become if he had no scruples at all or cared for anyone but himself. Duckman himself acknowledges this comparison.
- Jerk with a Heart of Jerk: Unlike Duckman, Mo is never shown to have any redeeming qualities.
- We Hardly Knew Ye: He shows up for one episode and dies at the end, although he also briefly appears in another as a ghost.