For Muppets that showed up after The Muppet Show ended, go here.
Kermit the Frog
Jim Henson (1955–1990; deceased)
Steve Whitmire (1990–present)
Banjo-playing amphibian from the Deep South and eternal Straight Man. Upon being discovered in a swamp by a talent agent, he headed to Hollywood, collecting the other Muppets along the way like so many hangers-on. Regularly depicted as the long-suffering boyfriend of Miss Piggy and the equally long-suffering pal to Fozzie.
Author Avatar: He is often seen as one for Henson, who at one point said, "[[Kermit]] can say things I hold back." Indeed, while Jim never lost his temper, there's a limit to how far Kermit can be pushed before he erupts.
Beware the Nice Ones: While he usually takes the antics of his co-stars with mild frustration at worst, there are rare occasions where he completely snaps. Miss Piggy, whose temper Kermit is usually at the constant brunt of, almost lost her job as a result.
Butt Monkey: He occasionally is this, often being eaten by monsters. In some cases, he gets kidnapped and almost nobody notices.
Character Tics: Flailing his arms around wildly like he's directing air traffic.
Control Freak: In The Muppet Show and beyond. Kermit does not like ad-libbing and handles very poorly under pressure. This is because ad-libbing in the Muppets actually is rather detrimental, with bizarre and unpredictable consequences.
Chaste Puppets: Has a nephew, but no children. note This isn't to say he's never expressed a healthy sex drive, especially with certain guest stars and sometimes with Piggy.
Deadpan Snarker: This was Kermit's original shtick to go along with his Only Sane Man persona. Later on, his snarkiness was downplayed to highlight his sweetness, but he still gets in on this once in awhile. This trope was reinstated in the 2011 film.
Vocal Evolution: During the first 20 years of his career (1955-1975), his voice sounded deeper, softer, quieter and somewhat stuffy and dull. Beginning in 1976, his voice became louder, more rubbery and less stuffy.
What the Hell, Hero?: Goes berserk when the Muppets do something that pushes them too far, such as kidnapping celebrities for their shows.
The unholy spawn of Barbra Streisand and a rack of pork. Hailing from the Midwest, she was living off of Beauty Contests before meeting Kermit. Has a chronic need for stardom and will steal the spotlight from anyone, with violence if necessary.
Big Beautiful Woman: She is usually treated as such, even though she's not a human woman, or even that big.
Brawn Hilda: She can bend metal bars with alarming ease.
Breakout Character: She was a fairly minor bit character early on in the first season, but swiftly became one of the most important stars of the show. In real life, Miss Piggy was one of the most popular fictional celebrities in the entire world during the late 1970s and early 1980s.
Deadpan Snarker: Especially when appearing as a guest on talk shows and the like; she'll snark about anything and everything. In the shows and movies, this trait is not as apparent, but she still displays it from time to time.
Determinator : Do NOT steal her purse whatever you do, she'll chase you all the way through Central Park if she has to.....on Roller Skates. And WHEN, not "if", she catches you, she'll kick your ass.
Fan Disservice: Piggy acts as the main chorus girl throughout the series and, like most performers in Kermit's troupe, has an inflated impression of her own talents (wearing clothes that are 30 pounds too small for her).
Feminism: The only icon of 70s-era feminism to be a pig voiced by a man.
Flanderization: When Frank Oz was still performing the character, her karate-chopping schtick was used sparingly (and usually took quite a bit of working up to, although casual sexism could get you there quicker) and her negative traits and attitude problems did not completely dominate her personality. In many of her appearances in the 2000's, however, her karate-chopping schtick has been overused and her negative traits and attitude problems have been over-emphasized.
However, some of her appearances still Flanderize her. A perfect example would be her Out-of-Character Moment in the Muppets' Good Luck Charlie guest appearance, because she would never ever hurt or threaten children, especially human children.
No Celebrities Were Harmed: Originally named "Piggy Lee", after the larger-than-life singer Peggy Lee. She was hastily renamed Miss Piggy when the show became popular, so as not to insult her namesake.
Tsundere: Type B. She normally acts elegantly feminine (though her ego is always detectable), but if you piss her off...
Unlimited Wardrobe: Especially ridiculous (if somewhat justified) in the 2011 movie, when she has a new outfit and hairstyle in every scene in which she appears. In-universe, she's been earning a good living since the Muppet Show years as an editor for a fashion magazine.
Hopelessly corny, porkpie hat-wearing showman and a magnet for tomatoes. Originally a failed comedian working out of the El Sleazo Cafe, he is the first to join Kermit's troupe. His personality is a send-up of the stereotypical Borscht Belt comic. Wocka wocka.
Ambiguously Jewishnote This is muddied up once we actually meet his mother Emily Bear. Though we've never seen Fozzie's father... Even if his father were Ambiguously Jewish, though, Jewish heritage is traditionally matrilineal.
Catch Phrase: Wocka Wocka! And just for the record, it's spelled "Wocka Wocka", not "Wokka Wokka" or "WakkaWakka".
Characterization Marches On: In the first season, he was intended to be the primary foil of Kermit and everyone else backstage. As a result, in the earliest episodes he tends to come off as abrasive, pushy, and obnoxious. They soon found a different, more neurotic, sweet, and vulnerable vibe for him, allowing the previous personality to be quietly discarded.
Establishing Character Moment: Frank Oz has said it took him a while to get comfortable with the character, and sites the sketch where Fozzie keeps giving Kermit the wrong cues for his "neck-a-tie" joke as the moment when he finally figured out how to make him work.
Verbal Tic: Frank Oz gave Fozzie a series of weird noises (the closest you could come to writing them out would be something along the lines of "Daaaaaaaagh" and "Agghaahaahaa") that he uses to convey certain emotions.
Amusing Injuries: Perhaps most notably, getting one arm stretched to about twelve feet in length in an ill-advised cannonball-catching act, and then turning for assistance to special guest star John Cleese, who kept misunderstanding Gonzo's requests and stretched his other limbs to match.
Ascended Extra: Both in becoming a character in the show (the puppet was first created as a background extra among many other weird monsters in the Christmas special The Great Santa Claus Switch) and becoming Those Two Guys/Narrator with Rizzo in the movies.
Deranged Bisexual: Gonzo doesn't seem to care which gender his would-be conquests are, although his preference is for females and/or avians. He's even hit on Big Bird. As for 'deranged', well... you have been reading this list, haven't you?
Demoted to Extra: Following Richard Hunt's death, Scooter was used far less often - not appearing in most productions and having minimal screentime in others. The 2011 movie appears to reverse this.
During the 1990s, Scooter was damn near unpersoned. Other characters without performers (like Rowlf, Dr. Teeth and Janice) at least made token unspeaking cameos, but Scooter was nowhere to be seen for just shy of a full decade. When the official Muppets website was launched, minor characters like Julius Strangepork got their own bios, but Scooter was only added after mass e-mails from angered fans. note Some even called Unfortunate Implications at stonewalling away a character whose performer died of AIDS.
The 2011 movie reveals that he got a job at Google after the Muppets went their seperate ways.
Jim Henson (1962-1990)
Bill Barretta (1996-present)
Originally a mascot for Purina Dog Chow, later rising to prominence as a TV sidekick to Jimmy Dean (yes, that Jimmy Dean). A cameo on Sesame Street blossomed into a full-time gig for the character.The in-universe Rowlf is a bluesy musician whom Kermit discovers in a piano bar. Since The Nineties, it's been a popular gag to pair Rowlf up with famous musicians, leading him to branch out into rock.
Author Avatar: A number commented that aside from his piano skills, Rowlf was very much like Jim - arguably even more than Kermit.
Back-Alley Doctor: His role of Dr. Bob on Veterinarian's Hospital was "a quack who's gone to the dogs".
Demoted to Extra: In the 1960's, Rowlf was pretty much the main star and leader of the Muppets, with Kermit being more of a second-tier character. In the 1970's, when Kermit officially became a frog and his personality was fully-realized, Rowlf turned those leadership duties over to the frog and became more of a secondary character, yet he remained a prominent character in Muppet productions.
After Jim Henson's death, his appearances became limited to mostly brief non-speaking background cameos. When Bill Barretta started performing the character, he gradually returned to regular speaking roles and core character status.
Early-Bird Cameo: Rowlf first appeared in Purina Dog Chow commercials in 1962. A year later, he began making regular appearances on The Jimmy Dean Show and proved to be quite popular.
Tareme Eyes: Makes sense, since they go with his kind, quiet, soft, calm, easygoing personality. Also very cute with Baby Rowlf.
The Voiceless: After Jim Henson's death, Rowlf quickly became this until a new performer (Bill Baretta) was found. Many people mistakenly thought that his silence was permanent due to him commonly being attributed as the closest to Jim's actual personality.
Sam the Eagle
Frank Oz (1975-1999)
Eric Jacobson (2005-present)
True to his name, Sam is an uber-patriotic wet blanket who acts as the Muppets' censor. He strives to crack down on "lowbrow humor" and bring dignity to the proceedings, without much success.
Flanderization: On The Muppet Show, he started out as a general, pro-American detractor of the show's non-cultural content and a Stop Having Fun Guy with strong, exaggeratedly right-wing strawman views on various issues. In recent media, such as the Muppet Viral Videos, he's been depicted as generally obsessed with Americana itself and not much else. (For instance, he starts singingnote actually sing-talking "American Woman" by The Guess Who just because it has "American" in the title, something that the old Sam would never do.)
Know-Nothing Know-It-All: For example, in the Rudolf Nureyev episode he was thrilled that the show would be featuring someone with culture, but referred to Mr. Nureyev (a ballet dancer) as "my favorite opera singer" and didn't recognize him in street clothes.
As Long as It Sounds Foreign: The language he speaks is explicitly referred to at least once as "mock Swedish"; it was once claimed that his actual native language is "mock Japanese". He occasionally uses English words and a bit of coherent Danish, but is otherwise just making a lot of nonsensical noises.
Though on the episode featuring Danny Kaye, the chef's Uncle (played by Kaye) revealed his actual full name, which was a string of mock Swedish syllables; he then admitted that he just calls his nephew "Tom".
Eyeless Face: He has no visible eyes, only bushy eyebrows where eyes should be.
Fauxreigner: Is sometimes acknowledged to not really speak Swedish.
Lethal Chef: The very few times he does actually manage to complete a dish, it usually ends up something the non-suicidal would not want to put in their mouths.
Nonstandard Character Design: The only Muppet to be designed to use the puppeteer's exposed hands. Note that in such cases it had to be operated by two puppeteers simultaneously (Henson: head and voice, Oz: hands). It takes a lot of dexterity to be that clumsy.
Once an Episode: Doing a little song and dance, then throwing some cooking utensils over his shoulder. Frank Oz had a Self-Imposed Challenge to try to knock over every single item on the back wall. He only ever managed it once.
Two-man peanut gallery and patron saints of Caustic Critics everywhere. They've never sat through a show that they didn't hate.
Audience Participation: Anytime the two appeared onstage on the Muppet Show. They aren't actually part of the Muppet Show's staff; they're just audience members. In a different sense, any time they heckled the stage also qualifies.
Characterization Marches On: In the Muppet Show: Sex and Violence pilot, the two talked a lot more slowly and sounded more like a couple of weak, tired, dying old men. When the Muppet Show proper began, they started talking and reacting a lot quicker and became more lively and energetic.
Corpsing: One of the most famous aversions, considering they always laugh at their own quips.
He still has the dress he used to get onto the lifeboat.
Flanderization: In The Muppet Show, they were audience members who constantly complained about the show. However, while they complained a lot during the show, they didn't complain about everything. Indeed, when it came to classic vaudeville numbers, they were positively enthusiastic and would even sing along, and rarely had anything negative to say about the guest stars. They show up in various roles later, where they complain about everything and seem to have never had a positive experience in their lives. It reaches its zenith in The Muppets at Walt Disney World, where they actually complain about not having anything to complain about.
Good Old Ways: They love the more old-fashioned Vaudeville and Burlesque acts, even performing a few themselves. Their whole heckling style is an old Vaudeville bit as well.
Vitriolic Best Buds: Constantly heckle each other too. "You old fool" is practically a pet name between them.
Dr. Teeth and the Electric Mayhem
A rock band consisting of Dr. Teeth on vocals and keyboards, Animal on drums (which he sometimes eats), Sgt. Floyd Pepper on bass guitar, Janice on guitar, and Zoot on saxophone. Lips later joined the band on trumpet.
Demoted to Extra: Throughout the '90s - with only Animal maintaining a steady presence and involvement in stories. Likely a result of Jim Henson and Richard Hunt's passings.
Guttural Growler: I'm gonna 'splode an atom bomb... drill a hole to your sooooouuuuulllll...
Never Bareheaded: Until the action figure came out in 2002, he was never seen without a hat, often wearing his usual hat when dressed or or playing the role of The Chesire Cat, and wearing a night cap when wearing pajamas (while the rest of the band didn't wear hats). The action figure had a removable hat, revealing that the character has a bald spot. The actual puppet wasn't seen hatless until a late-2000s group photo, and the first actual production to show him without his hat is The Muppets. In the latter two cases, he's shown at angles where the bald spot can't be seen.
Divergent Character Evolution / Early-Installment Weirdness: Something of an odd example. In the first season, Floyd Pepper made few appearances, due to the availability of his performer. During this time, Zoot essentially played Floyd's role on the show outside of musical numbers, which is why he is much more verbal during this period, as well as dating Janice. When Floyd became a full-time cast member, Zoot rescinded his duties and became the silent, low-key character we know today.
Starving Artist: Recently revealed that he's been sleeping in a phone booth for three months. This isn't quite an example, though, Zoot seems to imply that he's been sleeping for the entirety of those three months.
Breakout Character: From season two ofThe Muppet Show onwards, he's a prominent part of the main Muppet cast, gets more merchandise than Kermit, and is the member of the Electric Mayhem seen most often without his bandmates (he's probably the second-biggest example of this next to Miss Piggy). He was even the mascot of the U.S. snowboarding team for the 1998 Winter Olympics!
Dark Is Not Evil: He behaves like a complete psycho and tends to destroy things around him (hence his being kept in chains), but seems to be fairly close friends with his bandmates and the other Muppets. He even gets a majorBig Damn Heroes moment in The Muppet Movie.
Even Bad Men Love Their Mamas: In the recent-ish Muppet rendition of Bohemian Rhapsody, he only gets as far as "Mama..." Then he starts rushing around the stage shouting, "Mama," overjoyed at the prospect of seeing his dearest mother. Poor guy never does find her.
Later, they made a short celebratory video when the Bohemian Rhapsody parody won a Webby Award. The episode is just Animal calling his mama and excitedly telling her they won a Webby... the punchline being that he only caught her voice mail. The implications are that the second he as much as heard his mother's voice, he completely geeked out with excitement. That is ADORABLE.
The Unfettered: Not in the literal sense, of course. He's the one cast member who regularly has to be chained down.
Crossdressing Voices: Averted in the Sex and Violence pilot and the first season of The Muppet Show, when she's played by actual women (Fran Brill for the pilot and Eren Ozker for the show proper). From the second season on, she was passed over to Richard Hunt, who created her Valley Girl persona, and ever since then she's been a prime example of the trope.
Eyes Always Shut: Her original concept drawing actually had no eyes, but the actual puppet became this.
Gender Flip: Also, her original concept drawing indicated that she was male and heavily inspired by Mick Jagger.
Self-interested, sarcastic and snide, Rizzo basically hangs around with the Muppets, making a pest of himself and shoehorning himself into every act he can just for the attention. Even when Muppets Tonight gave him a job, he didn't change much. He likes eating, wooing female rodents, and having laughs at his castmates' expense, although a softer side of him does come out, especially when with his best pal Gonzo.
Ascended Extra: Rizzo started out as an anonymous member of a group of rats, but thanks to Steve Whitmire's performance soon emerged as the central rat character, started getting solo appearances and in the final season of the Muppet Show began popping up everywhere, usually as a background character and often in skits he had no place in. He was a pivotal supporting character in The Muppets Take Manhattan. Then, in The Muppet Christmas Carol he made the jump to main star when writer Jerry Juhl discovered just how well the Gonzo/Rizzo team worked, and since then has either been among the main characters or at least had a notable appearance in every major Muppet production. He also got what was pretty much Scooter's role on Muppets Tonight.
A wacko even by the Muppets' standards, Harry doesn't do much other than detonate random explosions, laughing all the while. Needless to say, he's something of a fan favourite. His personality was based on Muppet builder Don Sahlin, who had a similar fondness for wacky pranks that, yes, involved explosions.
Crazy-Prepared: Harry's is constantly seen detonating explosives... Explosives that logically would need to be set up ahead of time.
Even Psychotic Has Standards: During the song "Comedy Tonight", some monsters are seen chasing and terrorizing a little girl. Harry looks at the scene for a few seconds before blowing the monster up.
Demoted to Extra: Used to be a prominent character on the show, movies and TV specials, but fell out of use because the scriptwriters, while liking him as a character, had problems with finding material for him. (The problem, according to one of them, was that Beuregard "has no desires; he doesn't want anything.") Nowadays, you're lucky to find someone who remembers him. note His last major role was in The Muppets Visit Walt Disney World, a special that's been rarely seen since is initial broadcast due to Jim Henson's death ten days after its premiere. In the special, he's paired with Miss Piggy, tricking her into riding thrill rides instead of shopping and dining.
Hidden Depths: He seldom takes the stage himself, but he has been shown to be a surprisingly gifted harmonica player.
Imagine William Shatner with double the ego, half the brains, and a pig's snout. Link, star of the Pigs In Space sketches, considers himself a gifted actor, a brave action star, and irresistable to the lady pigs. Needless to say, he falls short in all of those categories.
Da Chief: In the Bear on Patrol sketches with Fozzie.
Demoted to Extra: If your familiarity with the Muppets is only with the movies, it comes as a surprise to see what a major character this guy was on the Muppet Show proper. After Jim Henson died, however, Link pretty much disappeared.
The Bus Came Back: He returned in the 2011 movie, appearing regularly in the background or in group scenes. He even has a major role in the "Smells Like Teen Spirit" musical number, singing as a member of the Muppet Barbershop Quartet with Sam, Rowlf and Beaker. As a result, this is the biggest role that Link has ever had in any of the theatrical Muppet films to date.
A goofy clown who throws fish all over the place. Only on the Muppets would this act be considered boring. His act hasn't changed at all over the decades, but he's still trying relentlessly for the chance to show the world his comedic genius.
Ascended Extra: Originally created as a one-shot character, he appeared multiple times on The Muppet Show and in the movies.
Catch Phrase: I throw the fish away! And they come BACK to me!
Flat Character: 99% of his appearances consist of variants on his boomerang fish act or talking about fish. He's still really funny.
A child prodigy, Annie Sue was introduced as Miss Piggy's understudy, known as the most hazardous position in the industry. Despite Piggy's scarcely-veiled animosity towards her, Annie Sue remained cheery and never failed to please the crowd. This, of course, only enraged Piggy even more.
Ascended Extra: Had turned up as a generic female pig used in various production numbers, but didn't get featured as a named character until season 3.
The Cutie: She's cute as a button, much to Piggy's chagrin.
Sitcom Arch-Nemesis: As Miss Piggy's younger, prettier and very talented understudy, this is how Miss Piggy saw her. It didn't help that Kermit found her to be quite charming and the theater audience adored her.
Robin the Frog
Kermit's adorable little nephew, Robin's role on the Muppet Show fit his status as the youngest of the cast members. Sometimes he would cutely win the crowd over, and other times he would ask embarrassing questions, make impolite comments, and pout when he didn't get his way. Robin also seems to be the Muppet character designed to appeal best to small children.
A Day in the Limelight: Robin may be a relatively minor character, but he's had two opportunities to take the spotlight all for himself: his performance of "Halfway Down The Stairs" (which became a Top 40 hit), and starring in his own action game for the Playstation.
Morality Pet: If the Muppets ever need to dial down the chaos and get a little sentimental, Robin is usually front and centre.
Notably, in the episode featuring Alice Cooper, they have Robin sing "Somewhere Over the Rainbow". In an episode full of irreverent humor, ghosts, monsters, and the most controversial guest star to date, they had that one sweet, innocent moment.
Nephewism: The second season firmly established Robin as Kermit's nephew. His parents are never seen, but his father was mentioned once on this show. Muppet Babies later referred to his mother being Kermit's older sister. This trope is so evident that Robin played the Tiny Tim role to Kermit's Bob Cratchit in The Muppet Christmas Carol.
Sweetums first appeared as one of the main villains in Jim Henson's The Frog Prince special, but deep down inside, he's actually quite sweet despite his intimidating looks. He's a large, full-bodied ogre who's often paired with Robin.
Odd Friendship: With Robin. Really odd considering The Frog Prince story cast them as enemies.
A chicken, and a non-anthropomorphic one at that. Despite this handicap, Camilla hasn't let that stop her from being a singer and an actress in many acts on the show. It's also won her the love of the Great Gonzo, although her boyfriend's roving eye for all manner of fowl has often put a strain on their relationship.
Ascended Extra: She only appeared a few times on the show, but is well-known to fans of the movies.
Cloud Cuckoo Lander: Shares a lot of Gonzo's wild interests, especially in the Disney World special
The "Phantom of the Muppet Theater", Uncle Deadly is some sort of refined, British dragon-ghost-thing known for performing Shakespeare. He was murdered by the critics and spent his time afterwards scaring the theater's crew just for fun. He became more well-known after The Muppets, where he served as The Dragon to the Corrupt Corporate ExecutiveBig Bad.
Pigs in Space's German-accented science officer, forever the bearer of bad news, and the only crewman on the Swinetrek who takes his job seriously. Outside of this role, Julius' performances are few and far between.
One of the show's stranger recurring characters, Marvin Suggs is a crazy little blue man with a silly accent who enjoys making music by beating on an instrument made up of sentient furballs (the Muppaphones). Despite his unusually cruel act, he rarely got any sort of comeuppance.
You Do Not Want To Know: Marvin once told Kermit that the Muppaphones have to be replaced after a while because they go flat (literally). When Kermit asks him what happens to the old Muppaphones, Marvin replies, "I don't think you want to know."
A bespectacled, stone-serious journalist, the Newsman never hesitates to break the latest news story... and the subject of the latest story never fails to break him. One of the Muppets' most slapstick characters.
Throw the Dog a Bone: In the 2011 movie, the Muppets allow the Newsman to participate in their telethon, running the phone lines. Not only does nothing bad happen to the Newsman for once, but at the end of the film he is able to report a news story in full, suffering no injuries!
A pair of snobby singers who would frequently take the stage to sing tired old ballads - only to abruptly have some strange fate befall them, always foretold by the song's lyrics. None of the Muppets seemed to like them much, except Sam the Eagle, who was forever trumpeting them as the only respectable act on the show. If only they could finish a number...
Flat Character: What happened to them was funnier than the characters themselves actually were.
Hollywood Tone-Deaf: A nice aversion. Richard Hunt and Erin Ozker were both talented singers, and they gave Wayne and Wanda voices like those of modestly talented performers overconfidently pushing their vocals harder than they could handle.
Platonic Life Partners: Given their limited personalities, it was hard to pin down their relationship in their old days; they seemed pretty chaste for a pair known for singing love songs to each other.
Put on a Bus: While Wanda's disappearance after the first season was unremarked at the time, she and Wayne reunited reappeared a couple years later as part of a This Is Your Life show for Kermit's birthday. They revealed that Kermit had fired them, and they were now scraping by on minimum-wage jobs. Kermit, appalled that he could have done such a thing, re-hired them. When they sang out of joy, Kermit re-fired them. Amusingly, this successfully kept the pair out of the Muppets for the next three decades.
The Bus Came Back: The pair finally rejoined the Muppets in the 2011 movie. While their return was a mild surprise in and of itself, nobody expected them to get one of the biggest laughs in the film!
Running Gag: The first season of the show had more running gags than character pieces. When the writing staff changed, Wanda was dumped, as running gags were all she had. Wayne, however, sporadically appeared in skits during the second and third seasons, oddly paired now with Uncle Deadly!
A scruffy, hyperactive little guy who joins in musical numbers unannounced and uninvited. He pops all over the place, either yammering in incoherent scat or playing an obnoxiously loud instrument. There's no stopping him, and it's foolish to try.
Divergent Character Evolution: A Muppet on Sesame Street sang "Mahna Mahna" on its first season, and was retained for future musical numbers. This character is not Mahna Mahna, but a different Muppet named Bip Bipadotta; although one could be forgiven for confusing them, as the two characters look very similar, and are both played by Jim Henson using the same voice. note Bip Bipadotta wears sunglasses and sings in English; Mahna Mahna doesn't wear sunglasses and speaks only in scat. This distinction is Serious Business amongst the fandom.
Non Sequitur: His act basically makes no sense whatsoever, but it's extremely catchy to most people. In Muppets Tonight, the song was presented as a mental disorder wherein the Snouths would appear from nowhere and sing whenever someone would say the name of the song. In The Muppets, it's played during the end credits. Some people say it to break the ice in a conversation when they don't know what else to say, in the same vain as "Supercalifragilisticexpialidocious"!
Flanderization: While many of his early appearances were in performances of the song, many of his early appearances also had him doing other things. In a sketch on The Ed Sullivan Show, he played the drums and provided wisecracks (and spoke coherent English) in the "String Quartet" sketch. In the "Sax and Violence" number he played the triangle bell and stole the show. But in recent years, his appearances are almost always performances or parodies of "Mahna Mahna". Even his Sesame Street counterpart, Bip Bipadotta, shouted "Mahna Mahna!" when he made a cameo in a 2009 episode.
One of the best-remembered "one-sketch" characters (possibly second to Mahna Mahna), Hugga Wugga is some sort of purple alien who wanders around an alien swamp chanting his name. He gets angry at creatures who try to sing anything else and tries to "assimilate" them, but is ultimately given his just desserts by a happy yellow creature that sings "You Are My Sunshine".
Berserk Button: Creatures that sing anything other than "Hugga Wugga".
Blow You Away: Shoots jets of air out of his nose whenever he gets angry.
The original planned "guest star" for the Star Wars episode, Angus McGonagle is an ugly purple gargoyle Scotsman whose main (and possibly only) talent is gargling George Gershwin compositions "gorgeously". For some reason, his act is widely hated among the Muppets and their intergalactic guests.
Scooter's uncle, the owner of the Muppet Theater, and the man who Kermit has to keep happy at all costs. He was an unseen presence in the first season of the show, but made appearances in person for the second season, only to disappear again.
Evil Uncle: Although his nephew was the only one he was nice to.
The Ghost: As noted, at first the mere mention of him was usually enough to cow Kermit into giving in to Scooter or Muppy's demands. After four seasons of this, they finally brought him out as a regular character.
However, the writers and performers eventually degreed that while Grosse was fun as an offscreen presence, in person he was too abrasive and threatening to be funny. Grosse was quickly Demoted to Extra. To see how they ultimately dealt with him, see below.
Killed Off for Real: If you take a deleted scene from It's a Very Merry Muppet Christmas Movie as official word, Kermit inherited the theater after Grosse's death. Either way, he hasn't been seen since. It says something about how unsuccessful the character was that he was the only Muppet to be killed off.