YMMV / Sgt. Frog

• Badass Decay:
  • Giroro was billed as the galaxy's most dangerous frog in his introduction, but his transformation into yet another Butt-Monkey for the platoon impeded any badassery. He still has some moments of competence and is not afraid to terminate with extreme prejudice when irritated (fortunately Keronians are Made of Iron), but he only sporadically gets any serious fights where he wins.
  • The Viper race. The first Viper is treated by the Keroro Platoon as a deadly serious threat, only being stopped through their teamwork. From that point on, despite each successive Viper tending to upgrade in some way, they became a steadily decreasing threat, to the extent entire armies of them weren't more of a menace than any other of the platoon's humorous daily misadventures. Sometimes averted though, with the first Viper defeating the Keroro Platoon in episode 143.
  • Keroro in Tamama's eyes who laments that the legendary Gunsou san he's heard in stories is normally just a silly man child. Of course in that particular episode/chapter (episode 336 and chapter 140) the readers and Zoruru see a glimpse of Keroro we've never seen before.
• Base-Breaking Character:
  • Kululu is either an awesome troll or the most annoying of the main characters. He is deliberately written as a Jerkass, and it's obvious everyone else is supposed to hate him, but it doesn't help that he does little of interest (more specifically, he's less of a character and more of a plot device used to add machines or science-goes-awry scenarios to the plot). However, many of the series' fans enjoy said Jerkass behavior and find his Troll behavior amusing alongside his interesting relationships with other characters, like Mutsumi and Aki.
  • Natsumi Hinata. She is either a viciously cruel bitch or a well-developed Tsundere, especially with her moments with Giroro.
• Creator's Pet: Joriri, an anime exclusive character. An annoying, one note joke, poor role model who apparently taught many lessons to the young Keroro and friends. Did we mention he wasn't mentioned until 150 + episodes in? Fans tolerated his presence in the fan favorite flashback episodes...until he appeared in the present, bumming it in the base. That officially graduated him into Creator's Pet territory.
• Crosses the Line Twice:
  • The Space Octopus/Life-o-puss scene with Momoka in Episode 6. The English Dub makes it worse by having the narrator get grossed out and off-handedly mention an octopus egg implanted in her stomach. Thankfully, that's a story that never comes to pass.
  • As seen in the 1st Season's 25th Episode, Keroro will not hesitate to blow up Earth if one damages his hard work (mostly his plastic model kits).
• Designated Hero: While the Keronians do cause a lot trouble, Natsumi's beatings are extremely brutal, bordering onto horrific. Likewise, she will severely punish Keroro over things that aren't even his fault.
• Die for Our Ship: What with all the All Love Is Unrequited going on, the more militant shippers take out their frustrations on any character they see as getting the the way of their favored ship. Very often in fanfictions with "Natsumi x anyone" (yes, even Fuyuki is fair game).
• Draco in Leather Pants: Kururu is seen as this by certain parts of the Fandom.
• Fanon: The fan theory that the Hinata family's Disappeared Dad is named 'Haru' (or any name similar, like Haruki) in line with the family's Temporal Theme Naming^note Natsumi = Summer, Fuyuki = Winter, Aki = Autumn, hence Spring = Haru is particularly popular. This was later confirmed in the last anime episode.
• Fetish Retardant: Paul acquiring the physical attributes of Aki. May even go as far as to be Nausea Fuel.
• Germans Love David Hasselhoff: The anime notoriously failed at being a hit in the United States, but it would be an understatement to say it succeeded in Spain, as it became almost as popular there as it was in Japan. The reasons were a quite good dub, a very clever adaptation of the original language puns, and an excellent marketing job, all of which caused a success in the country which was compared to that of the legendary Bobobo-bo Bo-bobo. It even became a Gateway Series to anime and manga for many Spaniards, as its release coincided with the expansion of internet otaku culture in the country, fitting the frequently parodic/referential humor of the series (which also helped to introduce many famous anime series that hadn't reached Spain, as well as re-introduce some which did but were less known to younger viewers).
• Hilarious in Hindsight:
  • The fictional Master Grade GM Sniper Custom from the first movie eventually got a real world release 11 years later, albeit not being Ver.Ka, but instead a GM 2.0 remold.
  • The climax of the 3rd movie involves using Nanola to turn a normal Gunpla into a full-sized RX-78-2 Gundam. The following year would see Bandai's attempt at a real one.
  • Paul after "transforming" into Akuma's Expy does a rather familiar kick. Note that this is several years before Street Fighter IV is released.
  • One episode has Keroro get his hands on a Master Grade model of the Gyan, several years before they actually made one.
  • There's a character named Seamstress Nuii.
  • Kululu's "We All Live Together" beam is able to turn animals into cute girls. Harnessing the power of Sandstar now, are we Yoshizaki? ^note Coincidentally, Mine Yoshizaki is the original character designer for the project and its game.
• I Am Not Shazam:
  • Dub example—While making Ikinari dumplings at lightning speed on an assembly line, Angol Mois mentions feeling "just like I Love Lucy in that episode of I Love Lucy".
  • A real-world example is Keroro's name. Initially, there was confusion that caused some English readers to call him Sergeant Frog, since even though his name wasn't changed for the English release, that was the name the series got. This also happened in the first few episodes in the dub of the anime adaptation. Most people know better now, though.
• Jerkass Woobie: Keroro is a big one, bordering onto Unintentionally Sympathetic. His platoonmates and superiors treat him as the Scape Goat, he alone was forced into servitude on Pekopon, and the punishments he receives is extremely brutal in nature. There are also many times when he is abused for no good reason, with almost no one trying to protect him or call out the abusers. It becomes worse in newer stories, since he learns to act more considerate and nice. Really, it can be argued that Keroro's Jerkass behavior is a strong case of The Dog Bites Back.
• Narm:
  • The third movie. Dark Keroro has nearly taken over the world and reveals his giant doomsday device. And what does it do? Slowly scoot along the landscape, plowing into things. REALLY SLOWLY.
  • And the goofy little dance Dark Keroro did to summon: didn't it crack you up?
  • The Second Movie. Where's the real "Deep Sea Princess"? It's was actually Natsumi all along wearing a some "Deep Sea Princess" gown.
• One True Threesome: Keroro/Tamama/Mois comes up most often.
• Periphery Demographic: Some of the Asian countries with a substantial Keroro fanbase actually have mandatory national service, like Taiwan and Singapore. Do the math on that, and you've got a generation of otaku fanboys who have served in the army - just like Keroro himself.
• Replacement Scrappy: Joriri gets a lot of hate in fandom; his debut episode was suspiciously similar to a manga flashback starring Garuru, enough that fans immediately believed he was 'replacing' Giroro's older brother. Though the chapter was later adapted accurately, that first impression has not gone away, as he continues to show up and 'taint' the Chibi-Kero episodes.
• Rooting for the Empire: The Keroro Platoon are so endearingly inept as invaders that a good deal of fans actually want them to succeed in their mission. It helps that many of Keroro's plans could actually prove beneficial for Pekopon (e.g. introducing advanced technology, improving the environment, and stopping dangerous threats) if done correctly.
• The Scrappy: The anime is known for Flanderization, adding several new recurring characters or expanding their roles, and one of the most despised anime-exclusive characters is Joriri, an unshaven bum who first appeared in the Chibi-Kero Flashback episodes. Basically a Perma Stubbled Expy for Adult!Keroro, he serves as a bad role model for the young tadpoles and engages in lots of scene-stealing antics. His first appearance bore a striking resemblance to one manga chapter focused on Giroro's relationship with his brother, leading fans to label Joriri a Replacement Scrappy. (The chapter was later adapted faithfully, but by then it was too late, and they'd found other reasons to hate him.) His frequent reappearances have him verging on Creator's Pet, particularly after he abruptly showed up on Earth and shacked up with the Platoon.
• Squick:
  • The part in one of the earlier episodes where a half-drowned Momoka gets... CPR'd/molested just off-screen by a tentacle monster alien while the others look on with horrified looks on their faces — and then they all agree not to ever tell her that it had happened. The dub takes this to the next level, stating that the "Life-o-puss" laid an egg in Momoka's stomach. When the creature zooms by in the scene after the eye-catch, Momoka asks if it planted something in her, which Fuyuki desperately denies.
  • As for Gunpla Builders, the various Gunpla destruction scenes seen in this show can make any of them cringe no matter how you look as a Played for Laughs-type gag. 10 points if the narrator says "Apologies to the Gunpla God!".
  • Some of gory violence can be hard to stomach, especially in the original manga. Natsumi has even done acts to Keroro such as: whipping him several times, crucify and burn him, attempt to punish him via the extremely cruel "ishidaki", and even outright tear him in half!
• They Changed It, Now It Sucks!:
  • Purists tend to be incredibly vocal about Funimation's dub of the anime here, although in the minority, but even in its original form the anime attracts a lot of scorn from fans of the Manga. Common complaints are that the show was sanitized for younger viewers, reworked into a marketing gimmick, and the changing of Dororo from a Technical Pacifist who routinely stood up to his friends into a whiny Butt-Monkey.
  • Many Japanese fans don't seem to mind Dororo's change too much though, as he gets more screentime and acts less sanctimonious.
  • Manga Keroro even breaks the fourth wall to lampshade this, telling everyone to clean up their act because they're going to be an anime. Tropers on the Wild Mass Guessing page have gone even further, suggesting that the anime is a cheap money-making scheme orchestrated by the Keronians.
• Unpopular Popular Character: Kururu/Kululu. In universe, he is the least popular among the platoon (not counting Dororo who everyone just forgets) with his toy selling worst out of them all. In real life (mostly in America thanks to the dub), he is frequently at the top of peoples favorite character list, usually in front of or behind Giroro.
• Values Dissonance: This is one reason why the anime ultimately failed to become a hit in North America, despite ADV Films and Funimation's attempts to promote it. While the anime is Tamer and Chaster than the original manga, it still has some moments of fanservice that Americans would consider to be too risque for a kid's show, and a lot of the Japanese jokes are too difficult to understand.
• Viewer Gender Confusion: Private Tamama due to his character design and traits. Back when the anime debuted, few were sure of which was his gender supposed to be, and some databases and wikis even listed his gender as female.
• What Do You Mean, It's for Kids?: The manga is shonen, but it has a very raunchy sense of humor and the female characters are often a source of Fanservice. The anime is Tamer and Chaster as a result of being made more family-friendly, but there's still some mild fanservice left in as a Parental Bonus.
• The Woobie:
  • Dororo. He takes a lot of abuse, especially in the early seasons of the anime, which just love sending him back into his Corner of Woe every chance it gets.
  • Fuyuki to a lesser extent. Before Keroro came into his life, he had no friends besides Momoka, and nobody joined him in the Paranormal club. This really shows in the Valentine's Day episode.
• Woolseyism:
  • The FUNi dub is full of these — Natsumi using her leek on Giroro's booby traps has already been turned into an outright reference to the Loituma Girl.
  • As mentioned previously though, the FUNi dub doesn't really know whether it wants to be this or a Gag Dub. It's sort of both.
  • There's a minor alien villain named, in the Japanese version, Dasonu*Maso, who is impersonating a human singer named Dance*Man, the joke being that the two names (ダソヌ☆マソ and ダンス☆マン) look really similar when written in katakana, which makes them easy to confuse. In the European Spanish dub, the human singer is named Dance Man, pronounced as in English, while the alien impersonator is called Danze Man, pronounced as in Spanish, "Dan-the Man" (with "th" as in "thanks"). "Dan-the Man" is how a Spanish person who doesn't know English would naturally read "Dance Man", so the fact that the two names are easily confused remains, and Danze Man's name becomes funnier to boot, because it plays off the fact that English pronunciation can be non-intuitive to Spanish speakers.