Abhorrent Admirer: Katella the Intergalactic Huntress is this to Robotnik - sure she's pretty sexy for a cartoon character, but she's WAY too aggressive.
Abusive Parents: Robotnik's mother is incredibly abusive to him, in some cases almost making him into a Jerkass Woobie.
"Ahh! HapPINESS is always so much more enjoyable when it's based on the misery of millions!"
Acid Reflux Nightmare: The knowledge that Tails has these sometimes is what propels the resolution of an episode.
Achilles Heel: In a more literal sense than usual: Robotnik falls into a vat of super-strength potion, and the only part that didn't hit was his... well, as he terms it, "caboose". Terms it after calling it his 'unmentionable' two seconds before.
Coconuts: I only wanted to tell you I saw one of those F.O.U's - I mean, C.I.A's, uh, or C.O.D's... Robotnik: Get to the point or your name will be M.U.D.
And That's Terrible: See above. "If someone tries to touch you in a place or in a way that makes you feel uncomfortable, that's no good!"
Admittedly the show was aimed at kids generally under 10 who probably could use the warning...
When Sonic and Tails are pulled over (on foot) for speeding, Tails suggests they outrun the policeman before he takes them to court. Sonic replies, commenting on how that would be illegal.
Arson, Murder, and Jaywalking: "You lost my rocket ship, you let the hedgehog ruin my plans, and NOW YOU'RE RUNNING UP MY LONG DISTANCE BILL!" - Robotnik
In an earlier episode when listing Sonic's offenses he tells his men that he ruins his schemes, he escapes his traps, and he helps nice people.
Ascended Extra: Several background characters from the second (officially aired) pilot "The Super Special Sonic Search and Smash Squad" are used as opponents in the Genesis video game Dr Robotnik's Mean Bean Machine, being given slight redesigns and individual names and personalities most of them didn't even have long enough to establish in their one appearance in the show. Scratch, Grounder and Coconuts themselves come from badnik designs from Sonic the Hedgehog 2 (with Scratch being the most radical change).
Aside Glance: Just one of many fourth-wall breaches.
Attack of the 50-Foot Whatever: Tails in one episode. In the Chaos Emerald saga, the Supreme High Robotnik, Master of the Universe. As well the odd walker machines used by Scratch and Grounder which are basically cockpits attached to massive walking steel beams with overly massive shoes. Sonic panics when he sees some massive robots in The Last Resort, but before he has to fight them, they surrender and run away for no explainable reason. Also Scratch, Grounder, and Coconuts are caught in a huge explosion at the end of the episode Trail of The Missing Tails and become extremely huge.
In another episode he practically turns into a parade float after eating a huge quantity of dehydrated food, then drinks a glass of water.
Batman Gambit: Sonic frequently does these to Robotnik and his lackeys.
Beehive Hairdo: Parodied in "Momma Robotnik Returns", when a social worker has actual bees flying around it.
Beware the Nice Ones: Sonic, Tails, and especially his temporary pet alien Goopster.
Beware the Silly Ones: How Mobius would fare if Sonic wasn't around to stop Robotnik's plans (or if Tails wasn't around to save the day whenever Robotnik, Scratch and Grounder actually succeeded in immobilizing Sonic) is surprisingly dubious for a show with AOSTH's reputation for wacky comedy.
Big Damn Heroes: The show had their share of these. In the episode "Zoobotnik", Mama Robotnik even makes one.
Bigger on the Inside: The Pseudo Sonic robot is this, since it's roughly Sonic's height on the outside yet oddly spacious inside when Tails and Laurence are piloting it.
"Blind Idiot" Translation: In the American Spanish translation, Tails is translated as a female character. For Latin fans of the games, this created a series-long problem, especially when talking to people who only knew of Sonic via the Spanish translation of the cartoon, and of course, were entirely (and understandably) convinced of Tails's female gender.
Bond One-Liner: In one of the PSAs, when Scratch and Grounder get run over by a truck. "Looks like these dumbots were flat out wrong about going in the street!" Leads to a bit of a Broken Aesop as Sonic then spends the remainder of the PSA standing in the street.
Bound and Gagged: Many characters, including Sonic and Tails, end up like this a lot.
Brilliant, but Lazy: A very good case can be made for Robotnik falling into this trope. In the episode "Birth of a Salesman", Wes Weasley sells him a variety of weapons that are surefire tools to catching Sonic, yet Robotnik passes them all off to Scratch and Grounder, who of course fail miserably, being too dumb to use the gadgets properly. Oddly enough, Robotnik puts most of the blame on Weasley, demanding refunds and accusing him of selling defective products. Weasley points out that if anything, his gadgets have worked too well, and are in incompetent hands. Robotnik remedies this by...threatening Wes Weasley into going along with Scratch and Grounder to oversee Sonic's capture, despite clearly being the only one capable of effectively operating the weapons, or at least more capable than his minions "supervised" by an unwilling peddler. The good doctor doesn't seem to realize capturing his hated enemy may require physical effort on his part. You'd think he would either step up his game or quit whining.
Brother-Sister Incest: Breezy and Robotnik Jr. Being robots, this is easy to miss, but it's not helped by the fact that Hero of the Year gives Breezy's full name as "Miss Breezy Hedgebot Robotnik".
Butt Monkey: Pretty much all of the bad guys, but especially Coconuts.
Clueless Aesop: The Sonic Says segments were absolutely drowning in these.
The first episode's Sonic Says segment showed Sonic and Tails surrounded by Badniks. Tails suggests they call 911 and Sonic tells him not to do that unless it's a real emergency. Although Sonic is very capable of trashing an army of Badniks, children could very easily get the wrong impression and think that good old fisticuffs is the right approach when surrounded by bigger, stronger, and possibly armed attackers.*
Actually, fighting in self-defense may seem to be the right approach when you have no time to reach for a phone or cellphone by the time stronger foes quickly approach to kill you, or if the power is out when trying to use a phone.
Possibly, the writers themselves realized that this was a stupid lesson to teach kids, so in a later Sonic Says, Tails is being chased by Badniks, and calls for help by a nearby police officer. He arrests the Badniks, and Sonic congratulates Tails for doing the right thing.
Another one has Sonic talking about how bad an idea running away from home is. This one is fine in itself, but he was telling it to Coconuts, whose "parent" is Dr.IvoRrrrrobotnik.
Sonic begins the "Poison Ivy" Sonic Says by saying "There may not be any poisonous flowers on Earth." ¿Que?
Conviction by Contradiction: In one episode Sonic's special sneakers are stolen. Sonic dismisses one suspect because his feet are too big to wear them, but the guy who actually stole the sneakers didn't want to wear them either. In fact, none of the suspects did.
Dartboard of Hate: Schoolteacher Lucinda keeps one of Robotnik in her classroom.
Dating Catwoman: Sonic and Breezie, at least in the beginning.
A Day in the Limelight: Any episode that focused on Tails. Also "Grounder the Genius" for Grounder and "Blank Headed Eagle" for Scratch as well as "Robot" for both Grounder and Scratch.
Department of Child Disservices: Averted. Sonic is temporarily put into the custody of Momma Robotnik, but a social worker annuls the adoption when it's revealed that Momma Robotnik disowned her own son.
In one episode, Grounder makes a comment on the radio about being "single and willing to disassemble". Now think about what that would mean for robots.
Also, the rivalry among Robotnik's robots seems to be a reference to sibling rivalry. "He made me first! I'm his favorite!"
Scratch really goes to town with that plunger of his in the opener. He's got his tongue hanging out and everything!
The Dog Bites Back: Scratch and Grounder are usually mindlessly loyal to Robotnik and recessive to his constant abuse. They are shown to exploit the odd moment to get revenge on him however (with varied success).
Drugs Are Bad: The main point of two of the Sonic Sez segments.
Dumb Is Good: Pretty well averted. Scratch and Grounder are dumber than sin, and Sonic is just as likely to defeat Robotnik with his intelligence as with with his super-speed.
Efficient Displacement: Used to comedic effect in Pseudo Sonic in that while piloting the robot Tails had no way to go through doors other than bashing through them.
Exact Eavesdropping: In one episode, Sonic is trying to figure out Robotnik's plan, who then proudly recites his plan to himself next to an open window.
Exit, Pursued by a Bear: One episode ends with Robotnik being chased by the slime monster from the space station Sonic and Tails were on. Another ends with him chased by an alligator.
Wes Weasley is very clearly inspired by Phil Silvers.
Scratch and Grounder were popular enough with Sega to gain their own Expies in the form of Decoe and Bocoe from Sonic X and Orbot and Cubot from Sonic Colors.
Expressive Mask: In "Magnificent Sonic" Scratch uses a mask in the shape of a mustached man with a moving mouth in order to deceive Ms. Possum.
The Face Of The Sun: A somewhat bipolar variation of this appears in "Tails' New Home"
Family Friendly Firearms: "Magnificent Sonic" in spades. Even the "Sonic Sez" that warns about the dangers of guns plays this straight.
Fan Disservice: There's many shirtless shots of Robotnik, as well as scenes that draw a little too much attention to his rear end. The epitome of this trope, however, is that bikini shot in "Hero of the Year." Seriously, are all those scenes of Robotnik bathing/shirtless/in skimpy clothes/wriggling his butt really necessary?
What makes this all the more hilarious is how in an interview, Milton Knight (the show's head animator) mentions that in creating Robotnik's design for the show, he strove to convey the doctor's perception of his own sexiness. It's no wonder he calls Robotnik "animation's sexiest fat man." and why Robotnik-in-bikini is in the page picture of Fan Disservice.
Fantastic Aesop: One episode has Tails disobey the "No Flying" sign and Sonic heavily scolds him for it, and at the Sonic Sez at the end, Tails even has to go to the juvenile office for it. The moral is supposed to be "obey every law", but the sign could've been for helicopters or airplanes, as what other citizens of the area could fly other than Tails? Was the law specifically made for Tails just to screw with him?
First Name Ultimatum: "You get outta here now or I'll tell everyone your real name is Miles."
Follow the Leader: The abstract, Jackson Pollack-esque backgrounds? The thin, nonsensical plots? The loose, Off Model animation? Yeah, a lot of this show was, shall we say, inspired by The Ren & Stimpy Show. Justified in that a number of ex-Ren & Stimpy crew members actually worked on the show.
"You robot chickens make me sick. Get a couple of pints of motor oil in ya and suddenly you're a tough guy!
In "Lovesick Sonic", there's a scene where an arrow points to Robotnik's underground drilling vehicle that is labeled "The Dastard", but it looks like "The Bastard".
Also when Katella the bounty huntress arrives, Coconuts falls to the floor and tries to look under her dress and smiles before she kicks him.
Gone Horribly Wrong: Robotnik built Scratch and Grounder to be superintelligent bounty hunters.
Growing Muscles Sequence: At least four times - Tails's New Home had Sonic puffing it up for about 5 seconds. Tails flexes comically in Spaceman Sonic, Robotnik became and stayed pretty well-muscled in the Chaos Emeralds special part 2. Tails got a taste of the power too, just long enough to scratch Grounder and ground Scratch.
Hero with Bad Publicity: Robotnik makes Sonic this in "Pseudo Sonic" and Tails this in "Too Tall Tails".
Heroic Sacrifice: In Tails' Tale", Sonic brings LeQuack and Tails to safety from a cursed temple at the expense of having to remain prisoner in said temple. However, this convinces King Kommamachs that Sonic's not as evil as Robotnik led him to believe.
High-Class Glass: Grounder gets one in the aforementioned "Grounder the Genius".
Horrible Judge of Character: Captain Rescue in "Over-The-Hill Hero", who allows Obviously Evil Robotnik to convince that he's another hero who's overshadowed by show-off Sonic.
Humiliation Conga: Happens to Robotnik in nearly every episode. Particularly noteworthy is the ending of "Robotnik Express" and "Robotnikland".
I Am Not Weasel: Quark, who, despite his duck-like lower half, insists that "I'm not a duck!"
Ice Cream Koan: Master Kwai Chang Crane perpetually rode the line on this. Some of his statements were alarmingly sensible.
"Surprises along the path of life are like dirty socks in the laundry of barefoot cousins."
If I Wanted You Dead: In one episode, Tails had been kidnapped and Sonic thought it was Robotnik's doing. Robotnik denied it by claiming he'd be torturing Tails had he kidnapped him.
In Name Only: The actual stories told in the show definitely don't have much to do with the games, but Adventures of Sonic definitely borrows more elements from the games than DiC's other Sonic shows do. To wit: not only do we have the necessary trio of Sonic, Tails, and Robotnik, but Badniks also have a presence in the form of Scratch, Grounder, and Coconuts (as well as a number of other models - such as the Buzz Bombers in "Mystery of the Missing Hi-tops" and the Choppers in "The Last Resort" - that appear in a few other episodes, with wild variations from their game designs). Additionally, actual Zones from the games are borrowed (and usually completely reinterpreted) for the occasional odd episode; "Submerged Sonic" takes place in Labyrinth Zone, "High Stakes Sonic" takes place in Casino Night Zone, and "Trail of the Missing Tails" features the Warp of Confusion as a tribute to the Special Zones. In fact, it could be argued that Adventures of Sonic, with its slapstick comedy and lighthearted nature, is a bit more akin in spirit to the bright, colorful, fast Sonic Genesis games than its darker and moreplot-driven brothers.
Interspecies Romance: Even though they're both robots, Robotnik Jr. (human) is involved with Breezie (hedgehog).
Invincible Hero: Sonic is more-or-less this. Robotnik, Scratch and Grounder very seldom get the opportunity to lock him up in a trap he can easily escape from.
It Got Worse: Coconuts tells Robotnik about the dream machine, but gets yelled at for not stealing it. Coconuts catches Tails, and gets demoted because it's not Sonic. Coconuts warns Robotnik that Sonic said he'll outsmart him, Robotnik takes it out on Coconuts and essentially demotes him as far as he can go. Each time it seems Coconuts falls farther and farther (literally).
Sonic dupes Robotnik into trading loot he stole from a nearby town for fake gold. Coconuts gets blamed in spite of not even being around for the dupe.
Large Ham: Rrrrrrrrobotnik, thanks in no small part to the incomparable Long John Baldry.
Leitmotif: Several of of the recurring characters have music that plays alongside their scenes. Most recognizable is Sonic's, which doubles as the show's title theme. Robotnik also gets a pretty catchy one. Even Scratch & Grounder have one, which is just a shortened version of Dovregubbens Hall.
While the title theme was used as background music on occasion, Sonic was more often accompanied by an extended remix of the original title theme from the Sonic games.
Look Behind You: Sonic manages this by just pointing and saying "I'M over there."
Losing Your Head: A constant occurrence with Scratch and Grounder.
Mass Hypnosis: Wes Weasley's Hypno-Vision commercials during Robotnik's campaign do this, however Sonic is immune since his eyes are too fast.
Medium Awareness: Sonic Says segments had this sometimes, as well as the show itself.
Mythology Gag: Despite being named Robotnik as opposed to Eggman, Robotnik makes a very, very large amount of references to eggs, either in puns or in his general planning (like the Omeletta episode noted above), in reference to his alter-ego; in the beginning of "Robotnikland", he even flies into a rage when Scratch and Grounder attempt to serve him pancakes for breakfast, rather than the egg-related dishes he prefers.
The episode "Lifestyles of the Sick and Twisted" actually had Tails call Robotnik "Eggman".
Near Villain Victory: Robotnik did actually come very close to defeating Sonic a fair few times. He does so each time he gains a Chaos Emerald in the four parter arc, only for Sonic to usually manipulate some time paradox against him.
Never Say "Die": The show went to great lengths to avoid this, with "Road Hog" being an exception.
Nice Hat: Most of the characters have worn some of these during the show.
Not Me This Time: One episode featured Tails being kidnapped and it wasn't Robotnik's doing. In another episode, somebody steals Sonic's shoes. The fact Coconuts had been caught at the crime scene suggested he had something to do it but Sonic reasoned Coconuts would have captured him instead of just stealing his shoes.
Off Model: You won't believe how many times Sonic's arms turn blue.
Not to mention the character art inside the disk cases of the second box set.
Hell, if you made a drinking game counting how many times Dr. Robotnik went off model, you'd be dead twelve times over.
Once per Episode: Robotnik's catchphrase "I hate that hedgehog!" which is generally said at the end of most episodes. Played with in "Over the Hill Hero," where, shortly after Robotnik has retreated with his mooks, Captain Rescue ends the episode with "I like that hedgehog!"
Wes also says "I love that hedgehog" at the end of "Hero of the Year".
There are a few episodes where Robotnik does not say the phrase once, including the above-mentioned "Over the Hill Hero".
Paper-Thin Disguise: Sonic is a master at this. It happens in almost every episode, and Scratch and Grounder fall for it every time. However, there were occasions where Sonic and/or Tails fell for these as well.
Series Fauxnale: The series was supposed to end after 65 episodes but after that they released "Sonic Christmas Blast" in December of 1996, between SatAM and Sonic Underground.
Shout Out: Professor Caninestein is obviously a reference to Albert Einstein.
There was also a rabbit character named Updike which is a reference to John Updike, the author of the book "Rabbit, Run".
Taken for Granite: Used four times throughout the series: first by Grounder in "Grounder the Genius", then by Scratch and Grounder in "Tails in Charge", then by Coconuts in the episode "The Magic Hassle", and last by Merlynx in "Hedgehog of the Hound Table", though that time it only affected Sonic's legs.
That Came Out Wrong: In "Sonically Ever After" Sonic and Tails first end up in the story of Hansel and Gretel. Upon noticing he's been hampered with the latter role, Tails points out "Hey, I just noticed; I'm a girl!". Doesn't help that a handful of fans have probably mistook him for one in the past.
Theme Tune Cameo: Catty Carlyle's song in "Sonic's Song" is the show's theme song With Lyrics. The theme song also uses portions of "In the Hall of the Mountain King" and "Flight of the Bumblebee". Both of these (along with certain background tunes) also take elements from the title theme for Sonic 1 and 2 for the Genesis.
Time Travel: The Chaos Emeralds four-parter. Complete with a massive...
Timey Wimey Ball: Sonic and Tails defeat Robotnik in several different eras, keeping the Chaos Emeralds out of his hands. Robotnik, in a rare flash of ingenuity, goes back to the time periods and grabs the Emeralds anyway. Sonic and Tails defeat him by traveling through time to the same timeuntil about a dozen temporal clones of each have assembled, totally smashing any pretense of a Stable Time Loop in the process. The fact that it toys with so many time travel tropes is one reason this four-parter is well-regarded.
Trademark Favorite Food: Chili dogs for Sonic and Tails, eggs for Robotnik (to the point where he beats Scratch and Grounder for making him pancakes as a surprise)
Trap Door: Robotnik has used a few of these. For an example, Coconuts has been a victim of one, sometimes multiple in the same episode. One was even mobile with hammerspace inside it.
Turned Against Their Masters: Breezie and Robotnik Jr. after their Heel Face Turn. Grounder also openly questions his allegience to Robotnik after becoming intelligent in "Grounder the Genius"
The Unfavourite: Coconuts, which is saying something considering how Robotnik treats his "favorites" Scratch and Grounder.
Villain Protagonist: The show sometimes borders near this. While Sonic and Tails are still often the center focus, a lot of screentime and focus is given to Robotnik and his henchbots in many episodes. The fact the show takes notes from one of the most iconic Villain Protagonists to date probably only fuels this.
Villain Song: Robotnik writes two brief ones in "Sonic's Song"; in his first attempt, Catty Carlyle twists it into a The Villain Sucks Song.
The second attempt, which is sung very badly by Robotnik himself, actually becomes Hilarious in Hindsight (and a tad ironic), considering that his voice actor was a professional blues singer.
William Telling: Sonic does this to one of Robotnik's robots. Getting up in Robin Hood garb and balancing an apple on his head, Sonic tauntingly asks the robot (Called Dragon Breath in Dr. Robotnik's Mean Bean Machine) if he's ever heard of William Tell. Infuriated, Dragon Breath throws his spiked club at Sonic, but the hedgehog's super speeds allows him to dodge just in time, so that the only damage done is that apple is split in half...and the tree behind Sonic falls over onto Dragon Breath.
You Answered Your Own Question: "What would I want with a two-ton baby ape who can lift giant rocks, fire bananas like a shotgun— HUH? and help me capture that pesky hedgehog SO ROBOTNIK WILL TAKE ME BACK!"
YouTube Poop: A frequently used source, if only for the sheer number of ways that Robotnik can be made to say 'penis' and other swears.