The cast of the manga and anime series Keroro Gunsō/Sgt. Frog.
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The Keroro Platoon
Voiced by: Kumiko Watanabe (Japanese), Todd Haberkorn (English, Funimation), Andrea Kwan (English, Animax Seasons 1-2), Sarah Hauser (English, Animax Seasons 3-4), Xavier Fagnon (French, SMI dub), Tony Beck (French, MIE dub),Eba Ojanguren (Spanish)"Our hero", a rather hapless Alien Invader who spends more time doing chores and goofing off than he spends actually trying to invade. His plans usually take the form of Zany Schemes that blow up in his face in various amusing ways.
- Anti-Hero: The loser type, most of the time. Also a Villain Protagonist, if an Ineffectual Sympathetic Villain and an Unsympathetic Comedy Protagonist.
- Anti-Villain: An outright Chaotic Stupid Harmless Villain who technically should take over the world, but he couldn't care the less, and is just a lazy, selfish and apathetic dimwit.
- Anti-Role Model: A very good example to show viewers how not to be a leader.
- Attention Deficit... Ooh, Shiny!: He pretty much get distracted over the sight of one Gundam model or anything else unimportant. For Sarge, it's "Gundam models first, invasion plans later".
- Berserk Button:
Keroro: WHAT FLAVOR IS YOUR BLOOD!?note
- Breaking his Gundam models is a sure-fire way to set him off.
- In a more heartwarming example, it probably isn't a good idea to threaten the Hinatas around him. Best proven when aliens posing as famous reality show stars visit the house and get a bit too touchy with Natsumi and Aki in the hot spring. This is how he reacts:
- Big Ol' Eyebrows: A flashback in episode 58 shows him with thick brows, which he "shaved off to be trendy". Tamama agrees, saying no one has eyebrows anymore.
- Bullying a Dragon:
- His relationship with Natsumi in a nutshell.
- Becomes a literal example when Warrior-Style was introduced in the manga.
- Butt-Monkey: Not only does his plans for conquering Pekopon end in failure, but Keroro is also often the center of abuse, usually from Natsumi or Giroro, whether or not he deserves it.
- Cowardly Lion: Whenever he isn't being a straight-up Dirty Coward when an opposing force shows up, this is a better quality of his. There are times when he will at least try to fight and defend his platoon himself even if he is terrified as opposed to running away. Even if he usually ends up having his ass handed to him anyway. This is most evident in the movies listed below.
- Crouching Moron, Hidden Badass: Rarely — very rarely — shows signs of this.
- In Volume 17, he stops Zoruru dead with a single shadow-wreathed look and a stern order. Then he does the same thing to a Kiruru unit in Volume 20.
- He kicks a lot of ass in the movies. Notable examples include: him being turned into a dragon in the fourth movie and proceeding to kick his entire platoon's dragon asses. Note that when he transformed, Keroro, like the rest of his platoon, forgot all about his mission and who he was and while the audience were privy to the other platoon-turned-dragon members thoughts, we do not hear Keroro's at all.
- In the third movie, Keroro engages his evil clone in a mecha duel to protect Fuyuki and holds on his own fairly well before he was downed. After reuniting with Fuyuki and finding Dark Keroro still alive, he angrily runs over and slaps the clone hard enough to send him flying.
- Didn't Think This Through: One of Keroro's Fatal Flaws as a character, alongside his Pride, Arrogance, and Incompetence is that he is very impulsive, willing to do anything to achieve his goals without realizing the consequences until it's too late, which is also one of the reasons why his plans for conquering Pekopon end in failure.
- An example lies in the episode where Kululu manipulates Natsumi and Fuyuki as a way to conquer Pekopon. Keroro is immediately jealous of this and after getting enraged that Tamama went the easy way out, which is partially thanks to his cuteness, he immediately tries and fails to manipulate the Hinatas to get rewards for granted and fails to keep his cool while doing so. Thinking that no one will thank him, Keroro decides to hold Pekopon hostage as a way to get what he wants. He fails to remember that 1.) he does housework for the Hinata household, 2.) one of his platoon members, Dororo, is a protector of Pekopon, and 3.) upon pushing the button, everything on Pekopon would be destroyed, including Gundam models.
- Another example lies in Episode 19b. After the platoon's new radio show immediately becomes a hit, Keroro decides to have Sumomo guest star, as a way to improve ratings. Instead of scrapping it due to her being busy at the moment, he decides to let Giroro performs her. He fails to notice that out of all the members, Giroro is a baritone, so it fails to even match Sumomo's real voice, resulting in another failed plan.
- Also, the episode where Natsumi gets sick and Giroro has to rescue her pretty much is all because of Sarge. When he finally gets the chance to conquer by conquering the Hinata household, Natsumi gets sick by a potion invented by Kululu that only affects her. Keroro fails to realize that because he ordered his comrades to smash every form of communication in the household, along with taking control of a barrier in the house itself, it leads to a major problem. Also, Sarge once again fails to realize that Natsumi is stronger and bigger than him.
- Plus, in one instance, Keroro gets an idea from Kululu to make a smaller version of Earth as a way to complete his homework. He doesn't realize until the last minute that it would violate space law and all life on Earth would then be moving to the new one. Needless to say, Keroro gets told off by Giroro, Natsumi, Aki, and Koyuki for making such an impulsive idea, as well as for nearly causing The End of the World as We Know It.
- Dirty Coward: Especially when pitted against Natsumi.
- The Ditz: Keroro is definitely not the sharpest knife in the drawer. In fact, he's a complete dimwit. Even more so in the Funimation dub.
- Dub Personality Change: He's a lot more ditzy and egotistical in the Funimation dub.
- Explosive Overclocking: Occurs if he manages to get oversaturated with water, briefly unlocking the Keroro From Back Then before he's brutally Brought Down to Normal again.
- Fatal Flaw: Keroro has a ton, but his most common flaws are Arrogance, Pride, Incompetence, and Impulsiveness.
- The Friend Nobody Likes: Aside from Fuyuki and Mois, the other characters treat him as this through Seniority, Proximity, Pity, Supervision, and deep down Caring (in Fuyuki and Angol Mois's case). This is large because of his incompetence, large ego, laziness, arrogance, and overall being a jerk. This is especially the case in the Funimation dub. In episode 31, the other members of the platoon beside Kululu refuses to help Natsumi and Fuyuki help him get back home, because of this.
- Get-Rich-Quick Scheme: Whenever an opportunity arises for him to make money to buy more Gundam models (or the invasion as he falsely claims to his platoon), you best bet he will not let it slip away. He is constantly coming up with money-making schemes like they're going out of style.
- Harmless Villain: He's so dumb that most of his plans have such gaping flaws they just collapse on himself. The rare times when he comes closer to subverting this are cut short by Natsumi or someone else figuring out a way to stop him that usually only takes a few minutes of an episode's time.
- His Own Worst Enemy: Hoo boy. Ultimately, most of Keroro’s problems stem back from his arrogance, cowardice, and laziness, combining with the fact that he has little to no military talent. As Giroro puts it, Sarge is more of a danger to himself than to the planet he’s supposed to be conquering.
- Heterosexual Life-Partners: Since arriving in Pekopon, he and Fuyuki have become inseparable.
- Hoist by His Own Petard: Many of his nefarious schemes back fire to bite him in the ass. Examples include him trying to harness the powers of a creature his race is naturally weak to so that he can start a laundry machine business... predictably, they break free and promptly attack him.
- Hypocrite: He calls most of his own friends for being lazy and incompetent, when he is already that in general.
- Idiot Hero: Whenever he and his platoon are charged with saving Pekopon from other alien threats and not being the "threat" themselves.
- It's All About Me: He tends to think himself highly a lot, especially in the Funimation dub.
- Improbable Weapon User: In many video games, he draws from his collection of toys and cleaning supplies to help him out—the vacuum is a particular favorite.
- Ineffectual Sympathetic Villain: He's absolutely horrible at villainy. His schemes almost always collapse because of some internal flaw. When they don't, Natsumi (or someone else) is there to put an end to them. Despite this, he's convinced he is some kind of brilliant conqueror and overlooks any past failures when basking in his own glory.
- Informed Ability: Supposedly a decorated war veteran, but (almost) never shows any of the competence and bravery you'd expect. A manga chapter eventually explaines why: Just before his first assignment, powerful aliens attacked and were obliterating Keron's forces. Keroro, unaware of all this, uses a port-a-potty which transforms into a space ship, takes off and single-handedly defeats the enemy, then lands. Completely oblivious to what just happened, he steps out to a hero's welcome and promotion to command of his squad.
- Jerk with a Heart of Gold: Occasionally Keroro comes off as this, except he's not so much a jerk to begin with as an annoying, mooching houseguest. However, he does tend to do the right thing when all the cards are down to crisis point—right by human perspectives; his own race may think differently. Less so in the Funimation dub.
- Jerk with a Heart of Jerk: A lot of the time. Pretty much anytime Keroro does something nice, it’s extremely self-serving.
- Large Ham: He has quite a dramatic flair, especially in the dub.
- Lazy Bum: Frequently spends his time building Gundam models and watching cartoons, rather than conquering Pekopon like he was told.
- Loser Protagonist: He's a total Butt-Monkey, and he's incompetent and lazy to boot.
- Lovable Coward: His antics are goofy and endearing (despite being a complete jerk), even when he's begging someone to save him from whatever mess he's just created.
- Manchild: In moments when he's genuinely excited about something, he expresses his feelings with child-like enthusiasm. On the more negative side, he's more concerned with slacking off and indulging in various medias over doing his actual job.
- Manipulative Bastard: He isn't above taking advantage of his friends for his own benefit. Notably getting Tamama to do all his chores under the guise of training him to become stronger, or buttering up Dororo to get him to lower his guard whenever he attempts to stop one of the platoon's schemes.
- The Neidermeyer: While everyone admits he's incompetent, only Giroro openly hates him.
- Never My Fault: It's rare for Keroro to admit his own faults and the problems he causes.
- Non-Action Guy: He has no warfare specialization like his peers and usually avoids combat capitalizing on his commander role. Even when he does try to fight, it's rarely the occasion in which he doesn't get his ass handed.
- Nepotism: In one episode it's stated that he only got as far as he did in the army because of his father.
- Otaku: Of the Gundam variety but also obsesses over the Admiral Geroro manga, space bikes, and trains, surprisingly enough.
- Pet the Dog: There are a handful of episodes and chapters where he shows off his sweeter side. It's mostly shown in his friendship with Fuyuki or with Angol Mois, but he has his moments with Natsumi and his platoon as well.
- In the Garuru platoon arc, he specifically asks Garuru to spare the Hinata family when it looks like the Garuru platoon have won.
- One story features him befriending a little girl who becomes fascinated with his hat. When it appears she has lost it, he lets her know that he is grateful for her trying to find it anyway.
- Signature Laugh: "Kerokerokero!"
- Small Name, Big Ego: Keroro often believes he's as clever and intelligent as he believes. He isn't.
- Smug Snake: One of the main reasons Keroro’s plans end up in failure is that he’s too self-centered and arrogant for his own good and oftentimes, leads him to make plenty of bullheaded decisions.
- Too Dumb to Live: A lot of times, especially when he tries to fend off Natsumi, who is stronger and taller than him and the other members of his platoon combined.
- Trademark Favorite Food: The Funimation dub exaggerates his love of hamburgers (or "cow flesh"). Star fruit is also pretty apparent, Justified as it 'saved' him in one chapter. It Makes Sense in Context.
- Transformation Trinket: The Keron Star, which lets him transform into a pre-peace treaty weapon called Warrior Style.
- Unsympathetic Comedy Protagonist: Keroro is not a good person, no matter how you look at him. This is especially true in the Funimation dub. Most of his problems come from his laziness and his selfishness and because of this, he deserves most of the abuse he gets. When he DOES become sympathetic... Well, he's still kind of pathetic most of the time. MOST of the time. Watch out when he isn't.
- Verbal Tic: Frequently ends his sentences with "...de arimasu!" to give him a militaristic feel.
- Villain Protagonist: Largely a Harmless Villain, of course.
- Vitriolic Best Buds: Has this with everyone, besides Fuyuki, but especially with Giroro. The majority of their interactions involve calling each other names, Giroro openly criticizing him, rightfully calling him either lazy, dumb, or useless as a leader, and Keroro teasing him for being serious all the time and hounding him about the invasion. But at the end of the day they remain close friends, and when situations get dire they have each other's backs.
- Weaksauce Weakness: Banana peels. He's compelled to step and slip on them.
- With Friends Like These...: Especially true in the Funimation dub
- Why Did It Have to Be Snakes?: The Nyororo, large dogs, and Banana Lizards(Though the last one is for a different reason entirely).
Voiced by: Etsuko Kozakura (Japanese), Brina Palencia (English, Funimation), Alice Beaver (English, Animax), Chantal Macé (French, SMI dub), Ionna Gkizas (French, MIE dub), Pilar Ferrero (Spanish)The team's youngest member, made obvious by the fact he's still got tadpole features. Despite his cuteness, he's got a Hair-Trigger Temper, a massive jealous streak, and likes firing his laser when provoked. Also, he loves Keroro.
- All Love Is Unrequited: Keroro seems blissfully ignorant about his feelings.
- Badass Adorable: He's got shiny eyes and Blush Stickers, but he is capable of sending people flying with his Breath Weapon.
- Bare-Fisted Monk: His primary fighting style aside from Blowing Stuff Up.
- Berserk Button: He's got a few, but people acting lovey-dovey towards Keroro is a big one.
- Big Eater: He's shown to eat snacks. Tamama likes to eat junk food and sweets the most. Especially candy, cake, soft drinks and potato chips.
- Blush Stickers: He has three little pink lines on his face that imply this trope. They vanish when he gets angry, though.
- Breath Weapon: What the Tamama Impact is.
- Brutal Honesty: Uses this on Karara to dissuade her crush... though he doesn't realize that's what he's doing.
- Crazy Jealous Guy: He really doesn't like anyone else getting too close to Keroro.
- Cute and Psycho: He's the youngest, most excitable member of the platoon. He's also an unstable yandere who will use his breath attack to kill anyone who pushes him too far or who he thinks is hitting on Keroro.
- Deliberately Cute Child: Well, not quite a child. He still plays up how cute he is, but the mask slips through sometimes.
- Don't You Dare Pity Me!: Goes through this with Mois a couple times.
- Energy Ball: His jealousy ball.
- Fair-Weather Mentor: Towards Taruru. Loves the way Taruru strokes his ego, hates his overwhelming cheerfulness and naivete.
- Feet of Clay: Gradually grows disenchanted with Keroro due to this, especially in the manga.
- Gonk: Most of the time, he's a cute frog alien with big shiny eyes. Whenever he's significantly ticked off, his expressions become grotesquely exaggerated and contorted with rage.
- Green-Eyed Monster: Jealousy is even his main Fatal Flaw.
- Hair-Trigger Temper: Has quite an explosive one that will be set off with unpleasant results if anyone or anything dares get between him and Keroro.
- Hate at First Sight: In the third movie, he instantly hates Shivava because of his pompous attitude.
- Ignored Enamored Underling: He has a very obvious crush on Keroro. Unfortunately for him, his boss is as oblivious as he is incompetent.
- Kawaiiko: Deliberately plays up his cute image.
- Killer Rabbit: He's an adorable tadople, but if you make him mad, you'll get a face full of his Breath Weapon.
- Love Makes You Crazy: Not like he wasn't crazy to begin with, but getting too close with his sergeant is one of the ways to make him mad.
- The Nicknamer: Calls Momoka "Momochi", Natsumi "Natchi", Fuyuki "Fucchi", and Mois "that woman". This is less of the case in the Funimation dub.
- Not Allowed to Grow Up: Possibly Invoked when he sees that his childhood friend and fanboy Taruru has hit puberty ahead of him.
- Ping Pong Naïveté: How oblivious he is varies depending on the episode, or by how funny it would be.
- Professional Butt-Kisser: Self-described in the dub as Keroro's number-one Yes-Man.
- Sweet Tooth: He loves snacks.
- Tyrant Takes the Helm: One episode involves him being instated as the new sergeant. He quickly rises to being a massive tyrant, throwing people into pits just for displeasing him. In the Funimation dub, he even refers to himself as a führer, if the allusions weren't obvious enough.
- Verbal Tic: Japan-only: "Desu!"
- Wide Eyes and Shrunken Irises: Frequently happens when he drops his cute façade.
- Why Can't I Hate You?: He views Angol Mois as his greatest competition for Keroro's affections, but sometimes has trouble viewing her as an enemy because she's too damn nice about everything, which just makes him even more frustrated with her.
- Yandere: Far worse than Momoka, as he tends to go straight for the hypotenuse-chopping option when he can.
Voiced by: Joji Nakata (Japanese, adult), Akiko Hiramatsu (Japanese, child), Christopher Sabat (English, Funimation), Scott Evans (English, Animax), Pascal Renwick (French, SMI dub), Arnaud Léonard (French, MIE dub), Víctor Prieto (Spanish)
Keroro's Lancer. Suspects that he's the only one actually taking the invasion seriously anymore. Hopelessly crushing on Natsumi ever since she beat him up during their first fight.
- All Love Is Unrequited: Natsumi doesn't seem to be aware of his crush.
- Amazon Chaser: He is attracted to Natsumi due to her fiery personality.
- Berserk Button: Anything that threatens Natsumi.
- The Big Guy: Out of the five frogs, he fits this the most, being a tough, combative character with a lot of firepower and a gruff personality who is also very loyal to The Hero. Indeed, the narrative treats him as such whenever it is needed or if it is down to a team of three. However, he is not the strongest soldier in the team (that being Dororo) nor the only muscle in the team (him, Tamama and Dororo all share that role, and even Kururu occasionally does it through his mechas).
- Blood Knight: He pretty much lives for war and battle. This is exaggerated more in the Funimation dub.
- Boisterous Weakling: Zig-zagged. He's an elite soldier, but he is also the target of countless humiliations despite how seriously he takes himself. Then again, whenever he threatens someone, he usually can back it up. It really depends on whether the episode's script wants to laugh at him or along with him.
- Brutal Honesty: It overlaps with Jerkass Has a Point. Giroro is not afraid of talking to Sarge about how he really feels about him.
- Butt-Monkey: Mainly Kururu's.
- Cannot Spit It Out: His affections towards Natsumi remain unknown to her.
- Can't Hold His Liquor: He passes out from a few drops of them.
- The Comically Serious: He's basically the only frog in the platoon who insists to be professional, but it naturally only leads to comical situations due to the craziness that surrounds him.
- Crazy Jealous Guy: Has his moments. In the manga, became so intensely jealous of Koyuki after she first arrived that he attempted to Murder the Hypotenuse. Lampshaded by Tamama's gloating thoughts about finally understanding the Corporal.
- Deadpan Snarker: This is especially the case in the Funimation dub, mainly towards Keroro.Keroro: Are we all in heaven?
Giroro: Not if I'm with you, we're not.
- Enraged by Idiocy: Especially when it comes to Keroro, which is emphasized more in the Funimation dub.
- Expressive Hat: The skull on his hat.
- Good Scars, Evil Scars: He has a massive scar over his eye.
- Gratuitous English: Sometimes his battle cries veer into this. Including, at one point: "This! Is! SPARTA!"
- Green-Eyed Monster: Gets this way over Natsumi from time to time.
- Guns Akimbo: Mostly seen wielding a machine gun and a Hand Cannon. Dual-wielded if the situation calls for it.
- High-Pressure Blood: Early on in the manga, he tended to bleed profusely when experiencing such intense emotions. That particular quirk seems to have fallen by the wayside.
- High-Pressure Emotion: Again, commonly set off by Natsumi. In several instances, just sitting around brooding causes him to emit such an intense heat that the others notice and complain/comment on it.
- Honor Before Reason: When the crew thought Fuyuki may have been killed underwater he insisted that they go back to rescue him or at least recover his body, in spite of innumerable enemies waiting for them.
- Hyperspace Arsenal: Can access his weaponry at any time thanks to Keronian technology.
- Informed Ability: His official sobriquet of being "The Most Dangerous Man in the Universe" became a gross hyperbole after just some episodes, if not in the very episode he was introduced.
- Jerkass Has a Point: He may seem rough to Keroro a lot of the time, but he's mostly right to do so, since he's a lazy, insufferable jerk.
- Jerk with a Heart of Gold: This side of him is mostly shown to his cat and Natsumi, but he has his moments with the platoon as well.
- Let's Get Dangerous!: When the situation turns serious, he's usually as proficent in combat as he looks, as long as he isn't fighting a hopeless enemy.
- Love at First Punch: He met Natsumi as he was trying to take over the Hinata house. She punched him so hard that his eyes were spinning in his head. Giroro fell in love with her as he fell to the floor.
- Love Makes You Crazy: He doesn't seem to be careful about himself...
- Mars Needs Women: He has a very blatant crush on Natsumi.
- Murder the Hypotenuse: In the manga, he attempted this on Koyuki right after her introduction.
- Number Two: In many ways: he is Keroro's closest friend (as well as the most involved with the invasion after him) and the second strongest in the platoon only behind Dororo.
- Only Sane Man: If it's not happening to Dororo when he isn't around, it's clear that Giroro defaults to this compared to Keroro and Tamama, mostly when he's forced to put up with the antics of Keroro and Tamama.
- Perpetual Frowner: His face is always in a frown.
- Pet the Dog: Or cat, in this case. Mostly focused around his pet cat and Natsumi. However, he has his moments with Fuyuki, Keroro, and the rest of the platoon.
- Primal Fear: He's terrified of ghosts.
- "The Reason You Suck" Speech: Gives one to Keroro in the dub of episode 15.
- Stay in the Kitchen: Part of his tsun-tsun act in the manga involves him making comments along these lines to Natsumi.
- Strong as They Need to Be: In some episodes, he's a competent soldier who just happens to be overwhelmed by circumstances; in others, he's a military clown who is actually as incompetent as Keroro.
- Terrible Artist: During the Amateur Film-Making Plot episode, it's shown that it took him 3 hours to draw one picture. Said picture resembles that of a child's scribble.
- Tsundere: He's rude and hot-headed, but he does have a soft side towards those he cares about.
- Tsurime Eyes: He does have noticeably pointy eyes...
- The Worf Effect: Despite being the hard-boiled soldier who has a considerable reputation for martial prowess (or rather because that), Giroro often gets incapacitated by the current threat of the chapter/episode. This tends to occur before he could even fire a single bullet.
- Vitriolic Best Buds: With Keroro. The majority of their interactions involve calling each other names, Giroro openly criticizing him, rightfully calling him either lazy, dumb, or useless as a leader, and Keroro teasing him for being serious all the time and hounding him about the invasion. But at the end of the day they remain close friends, and when situations get dire they have each other's backs.
Sergeant Major Kururu
Voiced by: Takehito Koyasu (Japanese), Chuck Huber (English), Geoffrey Vigier (French, SMI dub), Pierre Bodson (French, MIE dub), Juan Martín Goirizelaia (Spanish)The team's intelligence officer. Incredibly smug and self-satisfied, Kururu is constantly inventing all sorts of weird stuff, but few of these are actually meant to help the invasion... they're just for his own amusement. Loves giving Keroro just enough rope to hang himself, over and over and over again.
Much meaner in the anime, taking out many Pet the Dog moments. They EXIST, just not as much.
- Adaptational Jerkass: While he's always an asshole, the anime makes him more of one by removing many of his more sympathetic moments.
- Almighty Janitor: Subverted. Aside from being a technology wizard who can do almost everything, he is the highest ranked in the platoon, but Keroro is the commander instead of him.
- Brilliant, but Lazy: His inventions and machines are truly terrifying and might be a force to fear if he employed them seriously and not only to satisfy his weird whims. In fact, if he isn't amused by what's going on, it requires either cash payment or physical coercion to make him actually expend effort for anything.
- Creepy Monotone: Excitement makes his voice rise. This makes him even creepier.
- Depraved Dentist: Do not let him anywhere near your teeth. When Keroro's mouth gets invaded by cavity causing aliens, he takes great pleasure in the pain he causes him while looking at his teeth.
- Evil Laugh: KU KU KU KU KUUU...!
- Face Framed in Shadow: He perpetually has a shadow cast over the middle of his face, regardless of the actual lighting.
- Four Eyes, Zero Soul: Four eyes, and a terrifyingly sadistic personality.
- The Friend Nobody Likes: Admittedly, this is because he enjoys torturing them.
- Handy Remote Control: Always seems to have one around.
- Hidden Heart of Gold:
- More obvious in the manga, where he has several moments showing that for all his Jerkassery, he really does care about the rest of his team.
- A notable moment of this in the anime is when he saves fellow Wave buddy Saburo (spending the month's entire invasion budget in the process) without hesitation.
- Homoerotic Subtext: Deliberately invokes this with Giroro in the anime. Whether he's doing this just to screw with his head or out of some incredibly warped actual affection...
- The Hyena: Frequently begins a sentence by laughing.
- Hypercompetent Sidekick: Despite being the highest ranking soldier in the platoon, he's perfectly happy being this.
- I Just Want to Have Friends: During the Funimation dub anime New Year's Special he off-handedly mentions at one point he just wants to be loved.
- Insufferable Genius: He makes a point to rub in how smart he is to everyone's faces.
- It Amused Me/For the Evulz: The reason why he likes torturing his teammates/everyone else.
- Jerkass: Oh boy, he's probably the biggest one on the show.
- Mad Scientist: Well, it's more like mad roboticist.
- Nerd Glasses: Wears these, swirly eyes and all.
- No Celebrities Were Harmed: In the Funimation Dub, his voice is an imitation of Ed Wynn's.
- Odd Friendship: With 'Wavelength Buddy' Mutsumi. They aren't even shown interacting all that much, but they seem to be very buddy-buddy.
- Omnidisciplinary Scientist: Kululu singlehandedly functions as the go-to frog for any kind of invention. Medical science is the only exception compared to official medics like Pururu, although he is by no means unskilled at it.
- Pet the Dog:
- At times, actually shows signs of caring for others. One episode involved an actual puppy, complete with Natsumi and Fuyuki freaking out over what he might do to the poor thing, when he was simply petting it for real.
- A good example of the anime Flanderizing his character is their removal of two of his key moments during the Garuru Platoon's introduction: encouraging Keroro to keep resisting after losing contact with the others and opening a trap door underneath Keroro to force him to escape while he attempts to hold off Garuru armed with only his headphones. By contrast, Anime!Kururu simply retreats into his Hacker Cave, letting Keroro think he's abandoned him.
- Sadist: Especially in the dub. The sergeant major enthusiastically delights in inflicting pain on others. It's one of the big reasons everyone is kind of terrified of him.
- Saying Sound Effects Out Loud: Likes to announce when he presses the buttons on his latest inventions.
- Scary Shiny Glasses: If you see him do this, it's already too late.
- The Scrappy: In-universe; The Keroro Platoon are huge celebrities on Keron, except for Dororo (who nobody seems to know about) and Kululu (who is actively despised).
- Secret-Keeper: For 623 in the anime. When Giroro finds out that Saburo is 623 and confronts Kululu about it, the latter erases his memory about it.
- Signature Laugh: Kukuku...
- The Smart Guy: He's in task of most intellectual or technical matters.
- Spell My Name with an S: Kururu/Kululu. The English translation of the manga actually switched from Kururu to Kululu around Volume 10 or so, then switched back later on.
- Stalker with a Crush: Maybe towards Aki.
- Token Evil Teammate: While all of the platoon members are technically villains, he still fits, being the most sadistic of them all.
- Too Kinky to Torture: This is more of the case in the Funimation dub. When Fuyuki and Natsumi start beating him for tricking them into thinking he was being nice he says it was so worth the punishment he received and is upset when they stop hitting him.
- Transformation Ray: One of his favorite gadgets to build.
- Trickster Mentor: Certainly isn't above manipulating the others into self-improvement.
- Troll: He seems to go out of his way to annoy everybody around him.
- Verbal Tic: In the Japanese dub, it's "Da ze".
Lance Corporal Dororo, né Zeroro
Voiced by: Takeshi Kusao (Japanese), J. Michael Tatum (English, Funimation), David Lee McKinney (English, Animax), Pascal Nowak (French, SMI dub) Pierre Lognay (French, MIE dub), Alberto Escobal García (Spanish)The team's token Ninja. Used to be a painfully shy, sickly child, and so clung rather desperately to his friendship with Keroro... something Keroro shamelessly exploited, leaving him traumatized to the point that any reminder of these abuses triggers his 'Trauma Switch' and sends him into the nearest corner. Grew up to become an assassin, then got separated from the others on Earth and found acceptance and peace with a group of ninjas, leading to him changing his name and outlook on life.
- Antiquated Linguistics: See below.
- Beware the Nice Ones: That cute little tadpole became an assassin. Then a ninja.
- Big Damn Heroes: A specialty of his.
- Big Fancy House: Lived in one as a child.
- Blue with Shock: Trauma Switch, on!
- Break the Cutie: Played for Laughs during his childhood.
- Corner of Woe: He frequently is seen in there when he's made upset.
- Extreme Doormat: Keroro treated him horribly when they were little, and Zeroro still stuck by his side. He grew out of this in the manga; sadly, in the anime, he still gets trampled over regularly.
- Failed a Spot Check: Often on the other end of this, with others forgetting about him or failing to note his presence.
- Flanderization: In the manga, still doesn't show up very often, seems to have largely gotten over his childhood issues (though he has his moments), and is typically calm and collected. In the anime...
- Flowery Feudal Japanese: In the original language, he speaks in an archaic form of Japanese, using "Sessha" as his preferred pronoun and ending his sentences with the highly archaic "de gozaru."
- Good Is Not Dumb: Is considered the Token Good Teammate in universe and is credulous when concerning friendship, but not dumb at all. In the manga he is able to beat Mutsumi(who has an IQ of 350+) in a shogi game, and in volume 20 Kururu specifically asks for his help in mechanics. In the anime that is downplay for some reason but he is still shown as highly observant, rational and knowledgeable.
- Heroic BSoD: Goes into these regularly. Shows up far less often in the manga.
- Informed Ability: He's stated to be the strongest in the platoon, to the point his introduction has Giroro of all people wary to engage him in direct battle. Dororo is no joke and certainly seems the have the most dangerous, but not by the scary margin they claim: Giroro has occasionally matched his accomplishments when turning serious, and Kururu could probably overpower him with his vast array of inventions and mechas if he wanted.
- I Want My Beloved to Be Happy: When Koyuki had her ninja skills/memories sealed away, he was willing to let her live a happy, normal life, even though she could no longer see him.
- Lightning Bruiser: He is fast and stealthy like the ninja he is and can also perform very powerful energy techniques.
- My Hero, Zero: At least until he took a new name for himself.
- My Kung-Fu Is Stronger Than Yours: Dororo having trained as a ninja on Earth gives him a valuable edge against Keron-trained Assassins. Even his former superior Jirara is eventually beaten.
- Nature Lover: His favorite hobbies include training deep in forests and admiring flowers. His first idea for the invasion is to fill the city with them to conquer pekopon via peace.
- New Powers as the Plot Demands: The manga doesn't spotlight him very often, so it's not unusual for him to abruptly show up and whip out a new Assassin Art or Ninja Art and bail the others out.
- Nice Guy: Despite him having Trauma Switches during the flashbacks to his childhood, he's actually one of the nicest characters in the show.
- No Mouth: Always shown wearing a ninja, assassin or medical mask.
- Ping Pong Naïveté: In the anime, he often winds up asking "Keroro, are we really friends...?", yet never actually learns from his past experiences and is easily shocked back into his corner of woe by Keroro's latest transgression. He'll occasionally choose to sit out of Keroro's schemes out of resentment, but is always back to normal the next time he appears.
- Powered Armor: The H-to-H Assassin suit (which bears more than a passing resemblance to Zoruru's enhancements...)
- Sixth Ranger: Not supposed to be this, as he was always a member of the team, but the others tend to forget he exists so he frequently doesn't get to tag along with them.
- Technical Pacifist: Never wants to hurt others but often fights to protect his friends(or "so-called" friends...).
- Token Good Teammate: Especially in the manga, which is one of the reasons that he isn't very popular with those teammates.
- Trauma Conga Line: The anime just loves playing this for laughs, especially during flashbacks to the frogs' childhood.
- The Unfavorite: Thanks to being too nice for his team, he isn't always popular with his "friends"... assuming they notice/remember him. Extends to his portrayal within Keron Force media (such as being seated behind a plant during a news conference).
- Windmill Crusader: At least in the anime, where Koyuki is about the only one who sympathizes with his idealism.
- With Friends Like These...: Especially in the Funimation dub. In Dororo's debut, Fuyuki and Tamama both lampshade it.
(Shin) Keroro/New Keroro/Keroro-2
Voiced by: Aoi YūkiThe youngest member and the sole member of the second Keroro platoon. Excitable and naive newcomer. Also the sole soldier within the Keron Army after 100 years.
- Superpower Lottery: The Keron Star grants him modes based off each platoon member's preferred method of combat.
Voiced by: Tomoko Kawakami (Japanese [Eps. 1-231]), Houko Kuwashima (Japanese [Ep. 232 onwards]), Leah Clark (English, Funimation), Candice Moore (English, Animax), and Josu Cubero (Spanish)A timid Nice Guy who loves the occult. Very introverted, but he's compassionate and polite, and very inquisitive about the world at its weirdest.
- Agent Mulder: He is very excited about the paranormal, compared to Natsumi.
- All-Loving Hero: Doesn't seem to have a bad bone in his body and is almost ridiculously forgiving of others.
- Beware the Nice Ones: When he snaps, all we get to see is his Battle Aura and shadowed eyes — never what he actually does. Even Natsumi is absolutely terrified of pushing Fuyuki too far, and Keroro, normally somewhat made of iron, was reduced to a stammering, terrified mess at whatever he did to him the first time this happened...
- Big Brother Mentor: Has a shade of this towards Tomosu in the manga.
- Book Dumb: Does poorly in school, but is clearly one of the smartest characters in the show.
- Chubby Chaser: Doesn't seem to be one, but Keroro teases him about a former crush of his having gained weight. Though, from what was seen of her, she was of a very normal weight.
- Clueless Chick-Magnet: If it's female, and weird (weird as in a schizo billion-heiress, an Emotionless Girl with a shape-shifting space entity on her head, and a mermaid) there's a huge chance they will have a thing for him. He may not have an extensive fanclub like Natsumi, but at least four girls have crush on him. Only half of said girls are human and he doesn't know of any of their feelings at all.
- Extreme Doormat: Until you push him too far.
- Friend to All Living Things: Whether they be human, alien, or monster.
- The Heart: Keroro's walking conscience who always tries to resolve things peacefully.
- Heterosexual Life-Partners: He and Keroro are inseparable. It's implied that Keroro was the first friend Fuyuki ever had.
- Idiot Hair: A little blue one sticks out of the top of his head.
- Masculine Girl, Feminine Boy: Feminine boy to... just about every girl he knows, really, but it's most pronounced with Natsumi.
- Morality Pet: He's this along with Angol Mois, since he's usually the one who guilt trips the sergeant to reconsidering whenever he takes a plan for invasion too far.
- Nice Guy: Just don't push his buttons too far...
- Non-Action Guy: He has a tendency to sit back and watch events unfold.
- Oblivious to Love: Despite all of Momoka's Stalker with a Crush and Yandere tendencies, Fuyuki remains none the wiser to her affections, though it has been implied on a few occasions that he's perfectly aware.
- Red Oni, Blue Oni: Surprisingly, the red to Tomosu's blue in the 2014 anime. Justified since Fuyuki is much younger in this version. In the original anime he's the blue to his older, more easily angered sister's red.
- Strong Family Resemblance: To his mother.
- This Loser Is You: His social unpopularity and lack of skills is supposed to represent us, but he makes up for by sheer kindness and willing to help others. The Funimation dub really exaggerates this, although he doesn't seem overly bothered by it.
- Uncatty Resemblance: While it's not immediately obvious, he and Keroro are both outcasts in their societies who are more interested in hobbies considered weird by their species (manga and anime for Keroro, the occult for Fuyuki) than their actual jobs. They also both tend to get kicked around a lot.
- Weirdness Magnet: More supernatural things have happened to him than any of the other cast. Unusually for this trope, he loves it this way. Natsumi, not so much... To the point it's why Alisa first interacts with him.
Voiced by: Chiwa Saitō (Japanese), Cherami Leigh (English), Alazne Erdozia (Spanish)Fuyuki's tomboyish older sister, she considers herself—correctly—to be the first line of defense against Keroro's taking over the planet. Has a massive crush on Mutsumi, and is good friends with Koyuki.
- A-Cup Angst: At the very least, when compared to her mother.
- Academic Athlete: She excels at both her school work and at sports, despite having little to no interest in the latter.
- Action Girl: The platoon unilaterally considers her Earth's greatest warrior.
- All Love Is Unrequited: Hopelessly crushes on Mutsumi, while getting crushed on by Giroro, Koyuki, several of her female classmates...
- Anti-Hero: Type 2. She's protecting the Earth, even if she's a violent, anti-social brute. In fairness, the aliens she protects Earth from kind of deserve it, and she WILL protect her friends and family.
- Agent Scully: Compared to her brother, she usually doesn't succumb to the idea of extraterrestrial happenings that easily.
- Aw, Look! They Really Do Love Each Other: When Keroro goes missing because his space scooter breaks down in the middle of nowhere she volunteers to go find him. She responds to any accusations of care by saying she's just trying to avoid the attention if he gets found but she gives a warm smile when she finally gets him back.
- Badass Adorable: She's a cute, young teenager who just happens to be able to perform super human feats in the name of stopping Keroro's (half-assed) attempts at world domination.
- Badass Normal: She beat Giroro's web of booby traps armed with nothing but a stalk of leek during their first encounter.
- Big Sister Instinct: Gets riled up when Keroro's shenanigans threaten to being harm to her little brother, such as when he teleports him to parts unknown while they're playing a life-sized board game.
- Can't Live with Them, Can't Live without Them: Her relationship with Keroro in general.
- Charles Atlas Superpower: Is SOMEHOW able to keep up with other supernatural threats.
- Deadpan Snarker: She’s more of this in the dub, but the original version has her fair share of snark.
- Defrosting Ice Queen: She may still be suspicious of the Keronians in general, but she also seems to become a bit of a nicer character after they arrive—in addition to Giroro, she gets on pretty well with Koyuki.
- Disappeared Dad: Her father travels the world and is rarely home. He only appears in person in episode 357.
- The Dreaded: The Keroro Platoon often won't admit it but all are utterly horrified of Natsumi's wrath (except for Giroro, who's just in love with her) and this often keeps them from being able to carry ot their various invasion plans.
- Even the Girls Want Her: Has a considerable all-female fanclub at school, to the point that she received two shopping bags worth of chocolate for Valentine's Day one year.
- Girlish Pigtails: An interesting example. While they stay the same length throughout the manga, in the anime, they get shorter and shorter with each passing season until she practically has Boyish Short Hair in the final season.
- Good is Not Nice: She's not the nicest person around, but she is the one keeping Earth from being conquered on an almost weekly basis. She does later admit that she enjoys beating Keroro in particular for no reason. To be fair, he deserves it.
- Hidden Eyes: If she has these, it's a sure sign of trouble brewing for Keroro.
- Improbable Weapon User: Uses a leek to deflect bomb blasts.
- Jerkass/Jerk with a Heart of Gold: Wavers between back and forth, although the former is her more common side.
- Jerkass Has a Point: She's violent and mean towards Keroro, even when he doesn't mean harm. That said, he's idotic and egoistical, and does things mainly for his own pleasure.
- Knuckle Cracking: When those knuckles start cracking, a beating is about to ensue on Keroro.
- Powered Armor: Her Powered 723 suit.
- Masculine Girl, Feminine Boy: Masculine girl to Fuyuki's feminine boy.
- Red Baron: According to Fuyuki in the manga, her overprotective streak during elementary school earned her the nickname Devil Summer.
- Red Oni, Blue Oni: She takes things in a very excited manner, unlike her more collected younger brother.
- Pseudo-Romantic Friendship: Goes on dates with Koyuki, as friends, although it may not be entirely platonic on Koyuki's part (at least in the anime; in the manga, it isn't platonic on Koyuki's part at all).
- Rose-Haired Sweetie: As long as you're not Keroro, or up to some supernatural mischief, she's a pretty sweet friend to have, particularly to Koyuki.
- Shorttank: What she wears in the summer-time.
- Sibling Yin-Yang: She's assertive and loves sports, while her brother is withdrawn and nerdy.
- Tomboy with a Girly Streak: She's quite the tomboy, but also has traditionally feminine interests such as shopping and cooking. She's also quite the romantic.
- Trademark Favorite Food: Seems to be sweet-potatoes.
- Tsundere: A vicious Type A on par with the likes of Louise.
- Uncatty Resemblance: She is very temperamental, sharing this trait with Giroro.
- Wardrobe Malfunction: Every spin with Kururu's age-ray in the manga ends with her being half (or totally) naked one way or the other.
- Why Did It Have to Be Snakes?: Slugs or anything wet and slimy in general.
Voiced by: Akiko Hiramatsu (Japanese), Jamie Marchi (English, Funimation), Candice Moore (English, Animax), Vanina Pradier (French, SMI dub), Marcha Van Boven (French, MIE dub), Ana Begoña Eguileor (Spanish)A famous manga editor. Very self-confident and cheerful. She loves "Kero-chan" and his friends, but is usually away from home working.
- Action Mom: She's a mother of two, and is always doing bizarre action feats to protect her children.
- Adaptational Curves: Inverted; her breasts are somewhat smaller in the anime than they were in the manga.
- Badass Adorable: On everyone's don't-screw-with list as she capable of defeating almost any hostiles without breaking a sweat, despite that she's just a cheerful mother otherwise.
- Beware the Nice Ones: She's sweet and motherly, but everyone knows not to screw with her.
- Big-Breast Pride: She enjoys being younger for a day when zapped with Kururu's de-aging ray gun but when she's turned back she comments that she missed her regular buxom figure.
- Boobs of Steel: Strongest of the Hinata household.
- Buxom Beauty Standard: She has a voluptuous bust that easily attracts men.
- Dude Magnet: Her male co-workers are after fawning after her.
- Girlish Pigtails: You know it's summertime when Aki wears her hair like this instead.
- Hair Antennae: A few stray strands of hair stick out of her hair.
- Mama Bear: In Momoka's simulator she responds to what she thinks is an alien chasing Fuyuki by getting on her motorcycle and grinding the spinning wheel into its face.
- Ms. Fanservice: Frequently a subject of this, being one of the few (human) adults in the cast.
- Nice Girl: She is kind and motherly.
- Statuesque Stunner: She's one of the taller characters in the show, being an adult and all and is considered very attractive.
- Strong Family Resemblance: Aside from her feminine features, her teenage self is essentially female Fuyuki with glasses. This is lampshaded in the dub by the narrator.
- Why Did It Have to Be Snakes?: She is terrified of animals and doesn't let her children to have one, to the point that she cooked a parrot that some relatives gifted to them.
Voiced by: Hisako Kyoda (Japanese, old), Akiko Hiramatsu (Japanese, young), Linda Leonard (English, Funimation), Gloria Ansell (English, Animax), Nuria Marín Picó (Spanish)Aki's mother, and Fuyuki and Natsumi's grandma. A wise old woman who lives out in the country. Considered and revered by Keroro Platoon as the top-ranking "officer" in the Hinata clan, above Aki.
- Cool Old Lady: In her first appearance, she single-handedly saves Keroro, Giroro and Tamama from being lost in the forest and guides them back home.
- I Was Quite the Looker: She's revealed to look like Aki back when she was young.
- Miniature Senior Citizens: Fairly old, fairly short.
- Strong Family Resemblance: As shown during the episode where Dororo stumbles into the past, she was a dead ringer for a teenage Aki.
Close Pekoponian Friends
Voiced by: Haruna Ikezawa (Japanese), Monica Rial (English, Funimation), Andrea Kwan (English, Animax), Sapir Darmon (Hebrew), Debora Magnaghi (Italian), Nuria Marín Picó (Spanish)Heir to a multi-billion-dollar international corporation, Momoka seems sweet and innocent at first, but has a hidden dark side related to her obsessive crush on Fuyuki. Spends tons of money on various Zany Schemes that she hopes will help her get closer to him, with little success.
- A-Cup Angst: She couldn't help but be annoyed when she saw Natsumi and Aki (who both have better bodies) in bikinis.
- Action Girl: Given the proper motivation, yes.
- Berserk Button: Stay away from Fuyuki unless you enjoy getting in a Curb-Stomp Battle.
- Cannot Spit It Out: Momoka suffers greatly from this.
- Character Development: In the manga, she has been steadily outgrowing her original Yandere tendencies, even developing a friendly rivalry with Alisa.
- The Chessmaster: One manga chapter had her father try to force her into another private school, causing Fuyuki and the others to stand up to him. The end reveals that Dark Momoka planned the whole thing. She told her dad that she wanted to go to a private school so he could meet and gain respect for Fuyuki.
- Clingy Jealous Girl: Will get jealous if she thinks anyone's trying to steal her Fuyuki. Including his own family.
- Complexity Addiction: Some of her plans to win Fuyuki's heart rely on WAY too many variables to possibly work.
- Cute and Psycho: Sweet Momoka is a shy and cute girl with a crush on Fuyuki she just cannot confess. Her Dark Momoka personality is a Yandere Stalker with a Crush who is ready to destroy anyone who ticks her off or who she feels is her competition for Fuyuki's love.
- Expressive Hair: The weird spikes in her hair either droop or stick up depending on her mood.
- Important Haircut: A Flashback in the manga shows that she gave herself one when her Split Personality emerged.
- Harmless Electrocution: In her introducing chapter, this is the way the Sergent Keroro attacks her for save Tamama, ignoring Fuyuki's warning. She faint after being electrocuted.
- Like Father, Like Son: Momoka's split personality is nearly identical to her mother, Oka's, though while the perpetually enraged and brutal Dark Momoka is the secondary personality, Dark Oka, who is antisocial and Tsundere, is the primary personality.
- Lonely Rich Kid: Until she met Fuyuki. Her parents are constantly elsewhere around the world.
- New Transfer Student: As revealed in her How We Got Here Backstory in the manga, she used to attend a private school. Fuyuki was the first friend she made when she transferred to a public school.
- Powered Armor: Develops her own.
- Screw the Rules, I Have Money!: Frequently is able to buy her problems away.
- Shrinking Violet: Until her Split Personality takes over.
- Spikes of Villainy: Her hair does this.
- Split Personality: Momoka and Dark Momoka.
- Tomboy and Girly Girl: "Sweet Momoka" is the girly-girl, while "Dark Momoka" is the tomboy.
- Uncatty Resemblance: She shares Tamama's bipolar Yandere qualities.
- Yandere: Her split personality is one of these. This is emphasized more in the Funimation dub.
Voiced by: Keiji Fujiwara (Japanese), Kent Williams (English), Miguel Ortiz (Spanish)Momoka's personal servant and Battle Butler. Always on hand to tend to her every need and slightest whim, no matter what it calls for. Also serves as a surrogate parent of sorts, as her parents are almost always off doing their own thing.
- Battle Butler: He's capable of going toe-to-toe with Giroro if it means protecting Momoka.
- Captain Ersatz: To Ken Masters.
- Eyes Always Shut: His eyes are closed most of the time. When he opens them, he is shown to have yellow eyes.
- Worthy Opponent: He and Giroro consider each other to be this, or at least they did in Paul's debut episode.
Hojo Mutsumi/Saburo Mutsumi
Voiced by: Akira Ishida (Japanese), Joel McDonald (English, Funimation), David Lee McKinney (English, Animax) and Jaime de Diego (Spanish)An extremely laid-back, smooth poet and artist who has an Odd Friendship with Kururu and serves as Natsumi's Love Interest (only in the anime). Runs his own radio show in the anime, and carries a special pen that lets him bring his drawings to life.
- The Ace: In the few times he's seen in action, expect him to do it like a hardcore badass. He is outright stated to excel in sports, academics and arts.
- Badass Normal: Aside from his pen, doesn't have any special abilities or skills.
- Bishōnen: A standard example.
- Brilliant, but Lazy: Prefers lying around on rooftops to, say, actually attending school.
- Composite Character: In the manga, his name is Hojo Mutsumi. For some reason, the anime conflates him with another character called Saburo, who is a basketball pal of his in the manga, and gives him the composite name of Saburo Mutsumi.
- Covert Pervert: Strong undertones of this in the manga, bordering on Handsome Lech.
- Dissonant Serenity: Nothing unnerves him or makes him lose his cool expression.
- Expy: Very much resembles Kaworu Nagisa, and is even voiced by the same voice actor. His descent to the secret base is even inspired on Kaworu's to the Geofront.
- Friendless Background: Before meeting Kururu.
- Impossibly High IQ: Said to be 350.
- Odd Friendship: With Kururu; descibed as being "Wavelength buddies".
- Out of Focus: Frequently sees less action than the other human characters.
- Power of Creation: His pen.
- Uncatty Resemblance: He and Kururu are both tricksters who enjoy messing with people, he's just generally more pleasant and charismatic so it's harder to tell.
- Unfazed Everyman: He doesn't seem too fazed about the aliens who have come to invade.
Voiced by: Ryō Hirohashi (Japanese), Luci Christian (English, Funimation), Andrea Kwan (English, Animax Seasons 1-2), Jessica De Borja (English, Animax Season 3-4) and Sonia Torrecilla (Spanish)A cute, cheerful Ninja girl who found Zeroro and brought him back to her Hidden Ninja Village, befriending him and eventually accompanying him to the city, where she transferred into Natsumi's school and helped him locate the others.
- Action Girl: She's capable of performing various feats most teenage girls couldn't.
- Ambiguously Bi: Her devotion to Natsumi frequently has overt romantic undertones. Episodes do occasionally reference her being attracted to boys, however.
- An Ice Person: Many of her special moves are ice-based.
- Badass Adorable: She innocently shows off her superhuman abilities by performing a Wall Crawl on the side of a building in front of a whole crowd of people. Why did she think it was necessary? The third floor of the building had a restaurant that sold parfaits she wanted to try.
- Cat Smile: Whenever she smiles, it is drawn like this.
- Country Mouse: This is exaggerated in the English dub, but she's from a simple rural background in both versions.
- Genki Girl: Very hyperactive and as a person raised away from most, very interested in getting to learn about how people work.
- Highly-Visible Ninja: She's good at keeping out of sight when she wants, it's just... she's not so good about hiding her skills in normal, everyday life.
- Ms. Fanservice: Combines this with Innocent Fanservice Girl
- New Transfer Student: Introduced as this.
- No Social Skills: In an innocent and adorable way. She does things like try to crawl into the luggage section of a train because she thinks it would be a comfy place to sit. Natsumi is trying to help teach her how normal people act.
- Uncatty Resemblance: She and Dororo are both self-conscious ninjas obsessed with friendship. Dororo is considerably more broken and jaded than she is, however.
Voiced by: Keiji Fujiwara (Japanese), R. Bruce Elliott (English, Funimation), Michael Pizzutto (English, Animax),Patrick Donnay (French, SMI dub), Philippe Catoire (French, MIE dub), and José María Regalado (Spanish)The show's narrator.
- Butt-Monkey: Is stuck working on a show he hates/doesn't understand.
- Deadpan Snarker: Mainly in the Funimation dub.
- Lemony Narrator: Moreso in the Funimation dub. He's always commenting on the absurdities on the show, how much he doesn't like it, and is only doing the job to pay rent/gambling debts.
- The Men in Black: Appears dressed as a Kuroko with a big red N over his face.
- Trapped by Gambling Debts: In the Funimation dub he will sometimes mention he is thankful for the job helping him pay off his gambling debts.
- The Watson: Frequently questions the most absurd aspects on the show, just like a new time viewer would.
Voiced by: Emiri Kato
- Red Oni, Blue Oni: Somewhat acts as the blue oni to Fuyuki's red in the 2014 anime.
Voiced by: Ai Kayano
- Verbal Tic: "That is my hunch."
Voiced by: Mamiko Noto (Japanese), Carrie Savage (English, Funimation), Candice Moore (English, Animax) and Ana Begoña Eguileor (Spanish)The surprisingly cute Lord of Terror who was sent to destroy Earth as according to the prophecy of Nostradamus. Only she kind of missed her cue, and Keroro manages to convince her not to go through with it by virtue of being her beloved "Uncle". Sort of an honorary Sixth Ranger of the Keroro Platoon, though for obvious reasons she can't show off her moves all that often.
- Affably Evil: She's an Omnicidal Maniac, not that you could tell.
- Apocalypse Maiden: She was destined to cause it, but she overslept...
- Badass Adorable: She's a cute girl with a very innocent personality but she also wields the Lucifer Staff which can cause The End of the World as We Know It if she chooses to.
- Been There, Shaped History: Invoked; she's the Lord of Terror from Nostradamus' predictions because she told him of her arrival so he could warn the rest of the planet.
- Characterization Marches On: Eventually, the Gratuitous Spanish aspect of her character was dropped.
- Cosplay Otaku Girl: Seems to have fun dressing in various cutesy costumes.
- Did We Just Have Tea with Cthulhu?: The volume 19 of manga elaborate this. The Angols are beings from higher plan of existence, and while you can subdue them with Angol Stone, nobody understand what they really are. Keroro is the very first person who befriend the Angol.
- Dumb Blonde: Her naivete and Pekoponian disguise makes her seem like this. She's a bit more of this in the Funimation dub.
- Gratuitous Foreign Language: In the dubbed version of the anime, she slips in the occasional Spanish word with no real explanation why.
- Gyaru Girl: She has a fairly subdued kogal appearance in her human form. She's already Ambiguously Brown, but has platinum blonde hair instead of her natural silver hair when she chooses to stay on Earth. She wears a simple brown and white school uniform, skirt, and loose socks. It definitely adds to her character design's cuteness.
- Apparently, her father told her to do it in order to confuse people.
- Holding Back the Phlebotinum: Justified by the destructive nature of her powers; one manga chapter revealed she was hiding the negative effects this was having on her.
- Humanoid Abomination: She's the god of terror (formerly) destined to wipe out the Earth. She certainly doesn't act like it.
- Love Martyr: Towards her 'Uncle'. She'll do anything if it means it'll make him happy.
- Magical Girl: Her transformation sequences, stylized costume, and related accessories may make her a parody of the "magical girl" genre.
- Magic Staff: The "Lucifer Spear", with has the power to destroy the world. Her main attack is called "Hellmageddon" and can destroy a planet in a matter of seconds to full power.
- Morality Pet: One of two for Keroro, the other being Fuyuki. He's not above using her for his own personal needs though.
- Omnicidal Maniac: Played for Laughs.
- She Is the King: She's a girl, but her formal title is the 'Lord of Terror'.
- Slept Through the Apocalypse: Exaggerated. She slept through the one she was supposed to cause.
- Spell My Name with an S: Angol Moa in the manga, Angol Mois in the anime.
- Team Pet: An interesting inversion on the usual formula; instead of five humans with a ridiculously cute talking animal helper from space, it's five animals with a ridiculously cute talking human(oid) helper from space.
- Valley Girl: In all versions, although taken up to eleven in the Spanish dub.
- Verbal Tic: "Teyuuka" ("Or perhaps I should say") before expressing an opinion.
Space Detective Kogoro
Voiced by: Nobuyuki Hiyama (Japanese), John Swasey (English) and Anselmo Herrero (Spanish)An old childhood friend of Keroro's, Kogoro is a Space Detective who always seems to be down on his luck. Despite this, he always seems cheerful, laughing and grinning no matter what he might be thinking.
- Cloudcuckoolander: One even by Keroro's standards. In a way, he makes most characters look sane by comparison.
- The Exotic Detective: By virtue of being a weirdo.
- Hot-Blooded: Lives and breathes this. He's literally hot blooded enough to melt ice.
- Idiot Hero: An energetic exaggeration.
- Large Ham: The largest one in the butcher shop. He makes Kamina, All-Might, and Tim Curry look calm by comparison.
- Perpetual Expression: His face is perennially in a sort of powerful laughing expression (though he can lose the smile and shout in fear in extreme moments of danger). Only Rabbie can see through it and read his true emotions.
- Shout-Out: He's a parody of Kenji Ohba, the star of a Toku series called Space Sheriff Gavan. His name also comes from Kogoro Mouri from Case Closed.
- His associated gadgets are also parodies of Gavan and other Metal Heroes gear, including: a Powered Helmetnote , a Laser Shinai, and a Cool Kid's Tricycle.
- Sibling Yin-Yang: He's a Large Ham to contrast his sister's Shrinking Violet tendencies.
- Stepford Smiler: He keeps on laughing, even when he's upset or angry.
Voiced by: Tomoko Kaneda (Japanese), Leah Clark (English),Ana Guadalupe Hernández (Spanish)Kogoro's younger sister, and the only one who can tell how he really feels at any given moment. As a result, she frequently has to act as a "translator" of sorts. Does her best to support her brother by taking various part-time jobs.
- Apologises a Lot: Usually for her brother.
- Cloudcuckoolander's Minder: For her very weird and very unusual brother.
- Shrinking Violet: She's prone to Tender Tears a lot.
- Sibling Yin-Yang: She's shy but level-headed while her brother is a Hot-Blooded moron.
- Spell My Name with an S: Rabbie/Lavie
Voiced by: Akiko Yajima (Japanese),and Estívaliz Lizárraga (Spanish)An Emotionless Girl adopted by the Shapeshifting alien Nebula, who rides around as her cat-eared headband and fights for her. He takes out her opponents and eats aliens, all while searching for a way to help her become human. Alisa, for her part, seems entirely uninterested in this... but shows some interest in Fuyuki.
- Clothes Make the Superman: She isn't particularly powerful without her father's help.
- Emotionless Girl: Speaks blankly and apathetically and seems to not care about anything, but she really does feel deep inside.
- Heroic BSoD: She has this when Nebula was eaten by Chupacabra-like alien, even lost her sense of self-reservation.
- Magical Girlfriend: Though not an official girlfriend, the undeniable elements of this have led to... tension from Momoka/Fuyuki shippers.
- Morality Pet: Her "Daddy" and Fuyuki function as this.
- No Social Skills: She doesn't know much about normal life. Fuyuki's family often takes it upon themselves to teach her.
- Shapeshifter Weapon: Nebula.
- Unknown Rival: Unsurprisingly, Momoka hates her guts. She doesn't really know or care.
- When She Smiles: Alisa only usually makes a Slasher Smile, but she's downright heart-melting when it's genuine.
- The Worf Effect: Not to the same extreme as Giroro just yet, but all the same: when she gets knocked back, that's a problem.
The Garuru Platoon
First Lieutenant Garuru
Voiced by: Akio Ōtsuka (Japanese), Mathieu Moreau (French)Giroro's Aloof Big Brother, a famous sniper and hero of Keron Force. Was given his own platoon, and was assigned to confront and replace the Keroro Platoon. Cue the Wham Episodes.
- Aloof Big Brother: To Giroro.
- Big Brother Mentor: This is more obvious in the manga, where he's introduced long before the Wham Episodes, and is clearly shown before and afterwards to be very fond of his baby brother, despite Giroro's seething jealousy.
- The Chessmaster: May have been subtly manipulating the entire battle to make the Keroro Platoon look good. More obvious in the manga, where he explicitly spares Kururu's life and sends him to take on Tororo, which turns the tide of battle.
- Cold Sniper: More in the anime than in the manga; thank you, Flanderization.
- Evil Counterpart: To Giroro. Being the leader of his own platoon, it also hints it further by showing that someone with Giroro's mindset but more personality should led his platoon instead of Keroro. Anyway, the evil part is dropped fast.
- Friendly Sniper: Despite what he looks, is quite nice and friendly, and enjoys gently teasing his brother, but is still a well-respected commander.
- Goggles Do Nothing: His hat has an unique design, featuring a triangular nosepiece with yellow goggles covering his eyes. Their utility, however, is completely unknown.
- Heavy Metal: His music of choice.
- Improbable Chopsticks Skill: Inverted and Played for Laughs. Garuru's only weakness is that he can't eat with chopsticks unless he resorts to spearing his food.
- Opaque Lenses: His yellow goggles. Only in very rare occasions they allow to see his eyes.
- Red Baron: Nightmare of Keromon.
- Weaksauce Weakness: One chapter reveals he can't use chopsticks. Unless spearing his food with them counts.
Private First Class Taruru
Voiced by: Akeno Watanabe (Japanese), Chris Cason (English) and Estívaliz Lizárraga (Spanish)A cute, if insanely energetic, tadpole who absolutely adores his "Master Tamama"... And, rather obviously, was tapped to be part of the Garuru Platoon, where he cheerfully played Evil Counterpart to Tamama. Often puckers his lips up in a sort of "kissy face" expression.
- Broken Pedestal: Goes through this with Tamama.
- Dissonant Serenity: After his first fight with Tamama, when he took out Paul and Momoka in short order.
- Evil Counterpart: Becomes one to Tamama by default after joining the Garuru Platoon, although he somewhat subverts it by being the least similar to his good counterpart.
- Plot-Relevant Age-Up: Apparently hit Keronian puberty before Tamama, losing his tadpole looks. In the anime, this happens shortly after an episode involving him and Karara running around with Transformation Rays, including one that controls aging. Hmm...
- Punch-Clock Villain: Doesn't really think of following his orders as evil; when Tamama shows up for a rematch, is genuinely shocked by the idea that "I'm the villain in this story?!"
- Stealth Insult: His initial confrontation with Tamama during the Garuru Platoon's invasion of Earth is basically Taruru insulting his former idol in words of adoration and respect. It comes to a head when he stops calling Tamama "Sir" after he knocks him out.
- Unlucky Childhood Friend: The anime has him appearing alongside Karara a few times before his Plot-Relevant Age-Up. So far, Karara has yet to turn her flings of affection towards him.
- Verbal Tic: "-ssu", a derivative of desu. Sound familiar, dood?
- Youthful Freckles: He has them.
Lance Corporal Zoruru
Voiced by: Kazuki Yao (Japanese)A half-cybernectic assassin who appears to have joined the Garuru Platoon just to get a crack at Zeroro. Would probably love to be a Knight of Cerebus, if given the chance. Unfortunately, he tends to be even more forgotten than Dororo...
- Artificial Limbs: At least a full half of his body, bisected down the middle, has been replaced with robotics.
- Berserk Button: Being ignored.
- Black Eyes of Crazy: Zoruru had this during his childhood, and it only got more menacing when he became an assassin.
- Evil Counterpart: Towards Dororo, whom he insists on calling 'Zeroro'. He also has elements of Foil thrown on him, as while Dororo is undoubtedly menacing in his role, he is a ridiculously sweet and sensitive frog; Zoruru, on the other hand, is openly creepy.
- Failed a Spot Check: Like Dororo, ends up on the other end of this several times. One chapter plays with this, as he sits in on a meeting with the Keroro Platoon, taking Dororo's usual spot so that the reader's eye may glide right over him without seeing anything amiss... despite having just seen Dororo leaving with Koyuki. That's before the others take it up to eleven.
- Freudian Excuse: Volume 17 of the manga revealed he apparently attended the same school as Keroro and Zeroro, and was completely ignored when those two first met... despite standing directly behind Zeroro at the time.
- Knight of Cerebus: During the Garuru Platoon's invasion, he defeats and seemingly kills several of the Keroro Platoon's allies in rather nightmarish fashion, only to have this Subverted by an Anticlimax. Attempted again in Volume 17.
- Red Eyes, Take Warning: One eye, red pupil, black sclera. Judging from the Flashback in Volume 17, these are his natural eyes.
- Unknown Rival: He's perfectly capable of being an excellent rival to Dororo... if he wasn't so forgettable that literally everyone stops noticing him with in seconds. He has to go out of his way to get people's notice.
- Verbal Tic: Dramatic stammering, as in "Z... Zeroro..."
Voiced by: Kappei Yamaguchi (Japanese)An incredibly irritating tadpole who hacked into Keron Forces' computer once, got caught and was promptly recruited. Considers himself Kururu's rival, and longs for the chance to put him through the ultimate Humiliation Conga.
- Evil Counterpart: To Kururu. Among the Garuru Platoon members, he is the one who resembles the most his Keroro Platoon counterpart, both in physique and personality, down to having a similar signature laughter. And it is, apparently, because he intentionally copies Kururu in his attempt to be his rival. However, he also is meant to evoke Tamama, being the over-enthusiastic tadpole of his platoon.
- Oh, Crap!: When Kururu reveals that practically all of his programs are just inferior versions of Kururu's older projects, then immediately turns the tables on him.
- Recruiting the Criminal: Didn't sign up voluntarily, but was drafted after Keron Force caught him poking around their systems.
- Signature Laugh: Pupupu...
- Unknown Rival: Considers himself Kururu's rival; Kururu doesn't even remember him... And when he does, it doesn't end well for Tororo.
Ko-KeroA Sixth Ranger of sorts for the Garuru Platoon's debut, with very different origins in the manga and anime. The manga version is a Creepy Child clone intended to "replace" Keroro, while the anime is a deaged, Brainwashed and Crazy Keroro.
- Brainwashed and Crazy: Only in the anime.
- Put on a Bus: Manga only; the clone's ultimate fate is never detailed.
Chief Medic Pururu
Voiced by: Satsuki Yukino (Japanese), Terri Oliver (English)A childhood friend of Keroro, Giroro and Zeroro. Originally a civilian medic, she got bored and joined the military, ending up assigned to the Garuru Platoon.
- Affirmative Action Girl: Both in the Garuru Platoon and in the younger Keroro's circle of friends; she wasn't mentioned or shown in any flashbacks until her debut episode.
- Afraid of Needles: Her weapon invokes this.
- Badass Adorable: She's a medic that can kick ass with her syringe.
- Corner of Woe: Triggered when someone calls her obasan (auntie/old lady) or makes any sort of reference to her age.
- Evil Counterpart: Averted, as she is both introduced after the Garuru Platoon's Heel–Face Turn and lacking a direct equivalent in the Keroro Platoon. However, as she somewhat acts as her group's moral center, she might be considered Keroro's counterpart.
- Girl with Psycho Weapon: A giant syringe.
- The Heart: Of her platoon.
- Hospital Hottie: Triggers the usual "Hello Nurse!" reaction from Keroro.
- Improbable Weapon User: Syringes. Big ones.
- Older Than She Looks: About Old Maid level... in Keronian years.
- "Uh-Oh" Eyes: Sometimes gets a creepy look in her eyes... usually while she's still smiling. Especially in the manga...
- Yandere — Pururu has... interesting ways of showing her affection. Particularly in the manga, where she openly encourages Natsumi to torture Keroro more, smiling brightly the entire time. Pururu is a nurse, the more abused Keroro gets, the more he needs her medical attention.
The Shurara Corps
Voiced by: Norio Wakamoto (Japanese)The leader of a group of anime-only villains (created in the franchise after characters submitted by fans to the official Keroro Land magazine) who are out to steal the Keron Star from Keroro. Notably, all of the members were based on fan-submitted characters, meaning they all ascended to anime canon. The whole arc turned into a giant Monster of the Week-fest.
- Never Bareheaded: Always shown wearing an elaborate silver-and-gold helmet.
- Third-Person Person: SHURARAAAAAA~!!
Master Painter Putata
Voiced by: Kentarou Tone (Japanese)A spotted yellow Keronian who can bring his paintings to life. Highly excitable.
- All There in the Manual: His background notes reveal he is from a rich family, was born as Anono and has an Aloof Big Brother named Siroro.
- Art Initiates Life: With a snap of his fingers!
- Couldn't Find a Pen: His brush is actually a nyororo that uses Keronian fluids as ink.
- Dub Name Change: Known as "Pumama" in Spain due and to "Titata" due to idiomatic ordeals (to understand, "puta" means "whore" in both languages).
- Gratuitous English: His Verbal Tic: "Yeah! Yeah! Yeah! Yo! Yo! Yo!"
Super Marionette Mekeke
Voiced by: Yuichi NagashimaPutata's partner in crime and a master puppeteer who conceals himself via invisibility while fighting with his puppet.
- All There in the Manual: According to his background notes, he is an orphan, implying he probably made his puppet in order to overcome his loneliness.
- Canon Immigrant: In a way - Mekeke's puppet and apparent body was created by a fan like the rest of the Shurara Corps, but his real body was designed by Mine Yoshizaki.
- People Puppets: Another of his talents.
- Shout-Out: Visually and in nature, he is one big reference to Kankuro from Naruto, although his role is more similar to Sasori from the same series, down to being partnered in his corps with an eccentric artist character.
Voiced by: Kunihiko Yasui (Japanese)A mutant Keronian made of pure blue slime. Can transform others into mutants like him, but is weak to anything that can make him solidify. Brother to Dokuku.
- Blob Monster: The more intelligent sort.
- Body Horror: Can turn others into living puddles of flesh.
- Making a Splash: Giruru's attack style. You'd be amazed how good of a fighter a viscus blob of fluid is.
- Oblivious Love Interest: In the card game Anokoro Keroro Gunsou, his teammate Hanana is in love with him. Not that he realizes or cares.
- Sibling Yin-Yang: With his younger brother, Dokuku.
- Weaksauce Weakness: Powder. Any kind of powder.
Voiced by: Takeshi Kusao (Japanese)A ghostly Keronian with a heavily scarred face, a scythe blade replacing his left hand, and a demonic symbol. Brother to Giruru.
- Red Right Hand: His scythe-arm.
- The Unintelligible: He can only speak by saying his name, much like a Pokemon. However, his brother seems to understand him just fine.
Voiced by: Toshio Furukawa (Japanese)The assassin of the Shurara Corps, an older tadpole who can manipulate shadows.
- Cryptic Background Reference: He claims to be apprentice of Captain Jirara, a character who appears much later.
- Dub Name Change: His name was changed to "Zagege" in Spain, as "kage" is a homophone for "shit" in Spanish.
- Living Shadow: Kagege has the power to bring people's shadows to life and make them attack their owners.
- Power Glows: And so does Kagege. Constantly.
Voiced by: Kurumi Mamiya (Japanese)Once an abandoned Keronian doll, Nuii was brought to life by Shurara and made into one of his agents. She had the ability to turn everyone into plush dolls like herself, and under Gyororo's supervision, inflitrated the Hinata household in the guise of Natsumi's old teddy bear.
- Ambiguous Gender: There is heated debate as to whether Nuii is male or female, funny as it sounds.
- Early-Bird Cameo: Before appearing on the anime, she made her franchise debut in the spin-off card game Anokoro Keroro Gunso. The Nuii who appears in this game, however, is explicitly not the same person.
- Heel–Face Turn: Almost results in Redemption Equals Death.
Voiced by: Hiromi Hirata (Japanese)Nuii's superior, a Keronian covered in Extra Eyes who can blend into his surroundings, making him a perfect spy.
- Faceless Eye: When he's in his invisible mode, he is sometimes only seen as one of his many eyes.
Voiced by: Keiichi Sonobe (Japanese)A robotic Keronian with scanner eyes, magnetic hands, built-in jets and the ability to fuse others with nearby mechanical objects.
- Interplay of Sex and Violence: When Dororo delivers the final blow on Robobo, he seems to have a random orgasm before exploding.
Voiced by: Eiji Maruyama (Japanese)A snowman Keronian who can summon massive gusts of arctic winds and freeze everything around him. However, he's weak against any sort of heat.
- Minion with an F in Evil: Forcing people to play fun New Years games is not exactly evil.
Voiced by: Kenichi Ogata (Japanese) and Greg Dulcie (English)Keroro's famous and terrifying father. The mere mention of his name sets off all kinds of Parental Issues for his terrified son. However, in person, he seems to be rather laidback...
- Crouching Moron, Hidden Badass: Well... quite possibly, anyway.
- Like Father, Like Son: This is more evident in the dub, where Keroro's dad is a proud war criminal.
- Unnamed Parent: Like most of the parents...
- "Well Done, Son" Guy: Just the mention of his name turns Keroro into this.
Voiced by: Sachiko Chijimitsu (Japanese)Keroro's mother who first appeared in the KeroZero short shown before the 4th Movie. She's very loving toward her son like a good mother, but she also seems to have a tricky side to her.
- Amazingly Embarrassing Parent: She just loves to go around and talk about how wonderful her son is while offering sweets. She does this to everyone, much to Keroro's chagrin.
- Body Snatcher: Although Natsumi was the one who had the idea of switching bodies with her, with the consent of both, afterwards she just disappeared with Natsumi's body, going to sight see Pekopon and even on a date with Giroro (Even though he knew it was Keroro's mother) while Natsumi in her body got dragged to another city by Keroro's father, who didn't believe any switch had happened.
- Generation Xerox: Her son definitely got her looks.
- Mrs. Robinson: She actually went into this on Giroro.
- Shout-Out: Her design is very reminiscent of the mother in Atashinchi, who was voiced by Kumiko Watanabe, Keroro's voice actor.
Giroro-papaGiroro and Garuru's father. Appears to have a reputation just as terrifying as Keroro's father, though he's not mentioned as often. Makes a habit of turning even the simplest tasks into 'tests' for his sons.
- Drill Sergeant Nasty: He fits this Trope rather nicely in the Chibi-Kero Short.
- Unnamed Parent: He is not given a name.
Dororo-mamaDororo's mother. Looks exactly like her son (in a dress), and apparently passed down a lot of her personality traits, too. Whenever she sees Keroro, Giroro or Pururu, she immediately thanks them for being friends with Zeroro. Repeatedly. Over and over and over...
- Generation Xerox: She looks exactly like Dororo...
- Shy Blue Skinned Girl
- Unnamed Parent: Look above, she's got no name!
Voiced by: Junko Noda (Japanese) and Alison Viktorin (English)An extremely cute Keronian tadpole, Karara is an extremely naive daydreamer who dreams of finding her Knight in Shining Armor and falls in love at the drop of a hat with anyone who helps her out. Avoids Stalker with a Crush mainly because she runs off and does her "Bridal Training" offscreen, then shows up childishly expecting to have her affections returned...only to transfer her crush to someone else and start the whole process over again.
- Ascended Extra: Appeared briefly in the manga; became a recurring character in the anime.
- The Ojou: Her father's incredibly rich.
- Manic Pixie Dream Girl: She could be this, if she ever stayed focused on a single love interest for more than an episode or two.
- McNinja: The result of her crush on Dororo: she and her sister show up as hyperactive kunoichis. Hilarity Ensues.
- Running Gag: Almost always falls for somebody else every time she shows up.
Voiced by: Natsuko Kuwatani (Japanese)Karara's fraternal twin sister. Doesn't appear as much or get as much character focus as her sibling.
- Demoted to Extra: Taruru replaced her as Karara's constant companion in early episodes; she only got to debut after his Plot-Relevant Age-Up, and is still very much in her twin sister's shadow.
- The Ojou: Same as her sister, though this generally isn't invoked as much for her.
Voiced by: Junichi Sugawara (Japanese)An anime-exclusive character based on a fan submition, Joriri is an unshaven bum who appears in various flashbacks, giving the young Keroro, Giroro, Zeroro and Pururu questionable advice and generally being a poor role model. May have been introduced to add an "adult!Keroro" style character to the past, even though the younger Keroro already filled that role. Recently showed up in the present.
- Ice-Cream Koan: His big gimmick involves imparting an extremely odd form of sage wisdom that doesn't make a lot of sense.
- Perma-Stubble: Not an action hero, though.
- Sixth Ranger: He joins the Keroro platoon in the 6th season... for one episode. Although that event is still referenced later.
Assassin Captain Jirara
Voiced by: Kouji Yada (Japanese)Leader of the X1 assassin troop on Keron, and Zeroro's trainer in the art of killing. Cold and merciless and wanted in several galaxies, it only makes sense that he popped up on Pekopon...
- Artificial Limbs: It almost seems like this is a requirement for spooky assassin-types.
- Drill Sergeant Nasty/Sadist Teacher: Jirara trains his underlings by making them constantly fight each other nearly to the death. If you die, you were a bad student anyways.
- However, a Flashback in Volume 17 of the manga reveals that he deliberately chose a Lighter and Softer alternative to making Zeroro a full-fledged assassin, despite acknowledging that Zeroro had excelled in his training. When his pupil begged for an explanation, Jirara tells him flat-out that the assassin's path is "darker than you can even imagine".
- Giant Spider: He takes on this form in Dororo's nightmare.
Warrant-Officer BaririAnother character solely from the anime. Despite his rank and the respect he apparently has, he's very... crazy. Most of this is put in the direction of his unhealthy infatuation with Pururu. Really, really unhealthy.
- Love Makes You Crazy: And oh how it does. It's even more than just a Trope name. He's literally shown going to a psychiatrist about his insane love for Pururu.
Voiced by: Juri Ihata (Japanese), Caitlin Glass (English) and Sonia Torrecilla (Spanish)A pink Keronian-like alien, known as an Axolotl. She's a highly popular and very spoiled Idol Singer who likes to pull Ratings Stunts.
- Animal Motifs: She's associated with axolotls. There are three points on each side of her head that resemble an axolotl's frills, and her spaceship is an axolotl.
- Ascended Extra: Starred in a one-shot side story in the manga; became a recurring character in the anime.
- Idol Singer: Her profession.
- It's All About Me: Doesn't really care if others are hurt by her antics.
- Ratings Stunt: Like, say... pretending to be Natsumi via Ridiculously Human Robot and wreaking her life for kicks, then getting confused when Natsumi gets pissed.
- Voluntary Shapeshifting: Can transform into a human-like form at will.
Voiced by: Nobuo Tobita (Japanese) and Chris Patton (English)An alien race of humanoid snakemen, the Vipers are natural enemies of Keronians and are dangerous, deadly predators. Most of the Vipers that show up in the anime have a personal vendetta against the Keroro Platoon, thanks to what happened to the first Viper that targeted them. In the manga, on the other hand...
- Only Six Faces: Exaggerated. They only have one face and voice.
- Shout-Out: To Space Adventure Cobra; notice that they don't look like real vipers because they have cobra hoods.
- Species Surname: All of them are named Viper.
- The Worf Effect: In the manga, one shows up during Alisa's introduction just so she can eat him.
Voiced by: Mikel Gandía (Spanish)A sort of ancient Keronian super weapon that feeds off of negative emotions to gain strength and destroy planets. While not necessarily movie exclusive, they're a very big element of the first and third movies, and become a victim of the Worf Effect in the second. In the first movie, Keroro and Fuyuki accidentally unleash one on Tokyo.
- The Tokyo Fireball: Kiruru's doing.
Voiced by: Estívaliz Lizárraga (Spanish)An ancient Keronian weapons specialist that sealed away the first Kiruru, but got stuck in the proverbial can with him as well. She works off of positive emotions, and is able to turn into a key, the only thing that can reseal the Kiruru and save the world.
- Emergency Transformation: Granted, she couldn't do it until the characters actually got along again.
- Exposition Fairy: To Keroro and Fuyuki.
- Reset Button / Status Quo Is God: The plot couldn't allow the Keroro Platoon access to knowledge of ancient Keronian technology, as it might have allowed them to conquer Earth, especially as she was getting along with Kururu. So of course something happens to her by the end of the movie.
- Senseless Sacrifice: By the 2nd movie it's shown that the Maronians can easily take out a Kiruru, so vanishing to seal it up is more or less pointless as a long-term solution.
Voiced by: Houko Kuwashima (Japanese), Estívaliz Lizárraga (Spanish)A Maronian living at the bottom of the ocean who was feeling lonely one day and as a result, abducted Natsumi to be his princess. In the end, all he wanted was a mother figure rather than a princess.
- Canon Immigrant: The storyline from the second movie was eventually adapted to the manga, including Meru in it.
- Jerkass: To Maru.
- Parental Abandonment: His main issue.
Voiced by: Rosa Romay (Spanish)The only other friend Meru has, despite the fact he treats her like his servant and is generally unpleasant to her. Regardless, she remains chipper and incredibly loyal to him.
- Canon Immigrant: The storyline from the second movie was eventually adapted to the manga, including Maru in it.
Voiced by: Nuria Martín Picó (Spanish)The primary antagonist of the third movie. Cloned from a sample of Keroro's own DNA, taken off the Kero Ball when it was lost in an ancient Keronian facility hidden in the ancient city of Macchu Picchu in Peru.
- Evil Doppelgänger: Comes with the nature of being Keroro's evil clone.
- Heel–Face Turn: After the end of the movie, he becomes good and decides to travel the universe.
- Hijacked by Ganon: Turns out Dark Keroro was basically the third Kiruru after absorbing Keroro's DNA off the Kero Ball, complete with Miruru taking the same role as Mirara.
- Large Ham: "TWO MINUTES is all I need to conquer this mud ball!"
- What Is This Thing You Call "Love"?: Platonic variant. He's unable to understand why the human characters and the Keronian characters are friends with each other.
Voiced by: Estívaliz Lizárraga (Spanish)One of the members of Dark Keroro's army. A skilled fighter who acts like a braggart, but can back up his words.
- Arrogant Kung-Fu Guy: He is a skilled, yet pompous fighter. Tamama instantly hates him because of his attitude.
- Boom Stick: A staff WITH LASERS.
- Calling Your Attacks: Does this pretty much all of the time. In fact, Tamama defeats him by blasting him out of the sky when he was calling one of his attacks.
- To Sun Wukong of the Journey To The West tale that Dragon Ball was based on. Note his 'symbol', which is really a band around him that resembles the flying cloud, while resembling Wukong's Restraining Bolt. He even uses the original 'Great Saint That Surpasses Heaven' title when he first appears.
- He's also a pretty direct reference to Goku from Dragon Ball. He uses a blue blast of energy at one point charged up similarly to the Kamehameha and, in the final battle, attempts to use the Genki Dama while fighting against Tamama and Momoka, even calling up for other people's power. One of the scenes featuring him in the credits sequence is a homage to Dragon Ball's original ending and another one shows him in a place very similar to the Tenkaichi Budokai tournament, fighting against someone with the body obscured, but wearing pants and shoes identical to Yamcha's in the 22nd and 23rd Budokais.
Voiced by: Txemi del Olmo (Spanish)One of the members of Dark Keroro's army. A skilled fighter who prefers to let his weapons do the talking for him.
- Blood Knight: The guy likes to fight, and he does it well.
- More Dakka: Doruru has Arm Cannons, rocket launchers on his back and four miniguns IN HIS HAT. And his own Dendrobium Orchis much like Giroro's.
- Terse Talker: Doruru doesn't speak often. When he does, he hardly ever says anything longer than three syllables.
Voiced by: Rosa Romay (Spanish)Appearing at the same time as Dark Keroro, she's the only one capable of operating their Ominous Floating Castle, but there's something about her that even he doesn't know...
- Expy: Of Mirara from the first movie.
- Power Gives You Wings: As her alter ego Nazca.
Voiced by: Nana Mizuki (Japanese)One of Momoka's old friends, and shares a lot in common with her - except that her rich parents passed away early on. All she wanted was a real family, and from the depths of Mont-Saint-Michel, someone answered...
- Anti-Villain: An orphaned girl who forcibly turns the Keroro Platoon into dragons... but all of this is done out of an attempt to save the suffering Earth Dragon and have it as a family member. However, she apparently didn't get the memo that awakening the dragon will cause the Earth's destruction.
- The Kid with the Remote Control: The ancient book that only Shion can read summons the Earth Dragon in the first place.
Voiced by: Ikue Otani (Japanese)The Earth Dragon who Shion attempts to summon to add to her "family". However, its power is far too much for her to handle...
- Meaningful Name: Terara comes from 'terra', meaning Earth. Can also be read as referring to terror...
- Superpowered Evil Side: The Earth Dragon form, though it's officially sealed away by the end.
Voiced by: Daisuke Gōri (Japanese)Shion's legal guardian, very similar to Paul in more ways than one can imagine.
- Captain Ersatz: Like Paul channeling Ken Masters, Pierre turns into E Honda during their battle.
- Homage: In line with the ∀ Gundam references in the 4th movie, Pierre has a White Doll moustache.