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The Keroro Platoon
Voiced by: Kumiko Watanabe (Japanese), Todd Haberkorn (English) and 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.
- Adorkable: In moments when he's genuinely excited about something, he expresses a child-like enthusiasm that is just too cute for words.
- Anti-Hero: The loser type, most of the time. Also a Villain Protagonist, if an Ineffectual Sympathetic Villain and an Unsympathetic Comedy Protagonist.
- 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.
- 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 also 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.
- 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.
- 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.
- 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.
- Idiot Hero: Whenever he and his platoon are charged with saving Pekopon from other alien threats and not being the "threat" themselves.
- Ineffectual Sympathetic Villain: He's absolutely horrible at villainy. His schemes almost always collapse because of some internal flaw and when they don't Natsumi 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.
- 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.
- Japanese Honorifics: Refers to most of his Pekoponian peers with "-dono" to denote that he respects them, but not as much as he respects himself (see below).
- Japanese Pronouns: Wagahai, an archaic equivalent to the arrogant "Ore-sama" that has slight connotations of the Royal "We", demonstrating his self importance and giving an old-fashioned sensibility.
- Jerkass/Jerk with a Heart of Gold: Wavers back and forth.
- Loser Protagonist
- 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.
- Man Child
- The Neidermeyer: While everyone admits he's incompetent, only Giroro openly hates him.
- 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.
- Trademark Favorite Food: The Funimation dub exaggerates his love of hamburgers (or "cow flesh").
- Transformation Trinket: The Keron Star, which lets him transform into a pre-peace treaty weapon called Warrior Style.
- Unsympathetic Comedy Protagonist: Most of his problems come from his laziness and his selfishness. 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.
- Weaksauce Weakness: Banana peels. He's compelled to step and slip on them.
Voiced by: Etsuko Kozakura (Japanese), Brina Palencia (English) and 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 his "Gunsou-san!"
- All Love Is Unrequited: Keroro seems blissfully ignorant about his feelings.
- Badass Adorable: Hence the reason why most people call him cute. Just don't let the fact that he's cute fool you. He's really strong, he can fight a beetle as seen in Episode 72b and he can also do his physical training. He even did pull ups easily while holding a rock as shown in Episode 123b.
- Badass Gay: Deeply in love with Keroro, to the point of Yandere tendencies and with a Breath Weapon that can fry people and blast through walls.
- Bare-Fisted Monk: His primary fighting style aside from Blowing Stuff Up.
- Breath Weapon: Tamama IMPACT—!
- Berserk Button
- Beware the Nice Ones: Heavily. Shoop-da-whoops anyone who dare ticks him off.
- 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.
- Bi the Way: Despite his admiration of Keroro, he's shown attraction to women a couple times, an entire episode of the anime revolving around an attractive alien con lady trying to swindle him out of his money.
- Brutal Honesty: Uses this on Karara to dissuade her crush... though he doesn't realize that's what he's doing.
- Clingy Jealous Tadpole: He really doesn't like anyone else getting too close to his Gunsou-san.
- 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
- Don't You Dare Pity Me!: Goes through this with Mois a couple times.
- Eye Beams
- 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.
- Green-Eyed Monster
- Japanese Pronouns: Boku.
- Kawaiiko: Deliberately plays up his cute image.
- Love Makes You Crazy/Evil
- Ping-Pong Naïveté
- The Nicknamer: Calls Momoka "Momochi", Natsumi "Natchi", Fuyuki "Fucchi", and Mois "that woman".
- Not Allowed to Grow Up: Possibly Invoked when he sees that his childhood friend and fanboy Taruru has hit puberty ahead of him.
- Sweet Tooth
- Thinking Up Portals: Seems to have this ability
- Verbal Tic: "Desu!"
- Not quite to the extent that Suiseiseki takes it, but Tamama does say "desu" quite a bit.
- Yandere: Far worse than Momoka, as he tends to go straight for the hypotenuse-chopping option when he can.
Voiced by: Joji Nakata (Japanese), Christopher Sabat (English) and 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.
- Amazon Chaser: For Natsumi.
- Badass: A competent soldier, though the Gag Series nature of the show rarely gives him time to show it off.
- Berserk Button: Anything that threatens Natsumi.
- BFG: His Weapons of Choice.
- Blood Knight
- Butt Monkey: Mainly Kururu's.
- Can Not Spit It Out
- Can't Hold His Liquor: He passes out from a few drops of them.
- Charm Point: His belt.
- Clingy Jealous Frog: 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.
- The Comically Serious
- Expressive Hat: The skull on his hat.
- Good Scars, Evil Scars: A massive one on his face.
- 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.
- High-Pressure Blood: Early on in the manga, he tended to bleed profusely when experiencing such intense emotions. Thankfully, 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.
- Jerk with a Heart of Gold
- 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...
- Giroro Needs Natsumi
- Murder the Hypotenuse: In the manga, he attempted this on Koyuki right after her introduction.
- 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
- 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: Terrified of ghosts.
- Stay in the Kitchen: Part of his tsun-tsun act in the manga involves him making comments along these lines to Natsumi.
- Tsurime Eyes: He does have noticeably pointy eyes...
- Weapon of Choice: Is most seen wielding a machine gun and a Hand Cannon. Dual-wielded, if the situation calls for it.
- The Worf Effect: Despite being the hard-boiled soldier who has a considerable reputation for martial prowess, Giroro often gets incapacitated by the current threat of the chapter/episode. This tends to occur before he could even fire a single bullet.
Sergeant Major Kururu
Voiced by: Takehito Koyasu (Japanese), Chuck Huber (English) and 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.
- Brilliant, but Lazy: 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.
- Clarke's Third Law
- Creepy Monotone: Excitement makes his voice rise. This makes him even creepier.
- 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
- Gratuitous English
- 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.
- Ho Yay: 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
- 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
- Jerkass: Oh boy.
- Mad Scientist
- Nerd Glasses
- 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: Excepting medical science, Kululu singlehandedly functions as the go-to frog for any kind of invention.
- The Plan- Sometimes he dabbles in these.
- 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.
- 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: 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...
- 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.
- Takehito Koyasu
- Token Evil Teammate: While they're technically all villains, he still fits.
- Too Kinky to Torture: 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.
- Verbal Tic: "Da ze."
- Witch Doctor
Lance Corporal Dororo, nee Zeroro
Voiced by: Takeshi Kusao (Japanese), J. Michael Tatum (English) and 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: Speaks in an archaic form of Japanese, using "Sessha" as his preferred pronoun and ending his sentences with the highly archaic "de gozaru."
- Apologises a Lot
- Badass: Hands down the most effective of the platoon in a fight. His ninja arts are generally enough to resolve conflicts in an instant.
- Beware the Nice Ones: That cute little tadpole became an assassin. Then a ninja.
- Big Damn Heroes: A specialty of his.
- Big Fancy House
- Blue with Shock: Trauma Switch, on!
- Break the Cutie: Played for Laughs
- The Chew Toy
- Corner of Woe
- 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, anime!Dororo 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...
- 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 B.S.O.D.: Goes into these regularly. Shows up far less often in the manga.
- Ill Boy: As a child, was terribly sickly and always wore a surgical mask.
- 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.
- Lonely Rich Kid
- 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...)
- My Hero Zero
- 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.
- 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.
- No Mouth: Always shown wearing a ninja, assassin or medical mask.
- Shrinking Violet
- Shy Blue Skinned Boy
- 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).
- With Friends Like These...
- Windmill Crusader: At least in the anime, where Koyuki is about the only one who sympathizes with his idealism.
(Shin) Keroro/New Keroro/Keroro-2
Voiced by: Aoi YukiThe 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.
Voiced by: Tomoko Kawakami (Japanese [Eps. 1-231]), Houko Kuwashima (Japanese [Ep. 232 onwards]), Leah Clark (English) 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.
- A Boy and His X: A boy and his alien frog hell-bent on world domination.
- Adorkable: Particularly when the discussion of occult is involved.
- Agent Mulder
- 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.
- 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.
- 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.
- 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
- Loser Protagonist: The dub really plays up how much of an unpopular social outcast and general failure he is. He doesn't seem overly bothered by it.
- Masculine Girl, Feminine Boy: Feminine boy to... just about every girl he knows, really, but it's most pronounced with Natsumi.
- Nice Guy: Just don't push his buttons too far...
- Non-Action Guy
- 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.
- Oblivious to Love: Despite all of Momoka's Stalker with a Crush and Yandere tendencies, Fuyuki remains none the wiser to her affections.
- Strong Family Resemblance: To his mother.
- 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.
- Morality Pet: Is usually the one who guilt trips the sergeant to reconsidering whenever he takes a plan for invasion too far
Voiced by: Chiwa Saito (Japanese), Cherami Leigh (English) and 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.
- 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.
- Aww, 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 fond 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.
- Charles Atlas Superpower: Is SOMEHOW able to keep up with other supernatural threats.
- 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.
- Girlish Pigtails
- 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.
- Improbable Weapon User
- Jerkass/Jerk with a Heart of Gold: Wavers between back and forth, although the former is her more common side.
- Knuckle Cracking: When those knuckles start cracking, a beating is about to ensue on Keroro.
- Hidden Eyes: A sure sign of trouble brewing for Keroro.
- Powered Armor: Her Powered 723 suit.
- Masculine Girl, Feminine Boy: Masculine girl to Fuyuki's feminine boy.
- Not So Different: She can be just as arrogant, self-absorbed and overconfident as Keroro at times, which is probably why they get along well.
- Moreover, she can be as violent, domineering, and no-nonsense as Giroro, which probably is part of the reason he respects her so much.
- 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.
- Romantic Two-Girl Friendship: Goes on dates with Koyuki, as friends, although it may not be entirely platonic on Koyuki's part.
- 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.
- Sibling Yin-Yang
- 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 essentially a genderswapped human version of 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.
Voiced by: Akiko Hiramatsu (Japanese), Jamie Marchi (English) and 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
- Badass Adorable: On everyone's don't-screw-with list as she capable of defeating almost any hostiles without breaking a sweat.
- Beware the Nice Ones: She's sweet and motherly, but everyone knows not to screw with her.
- Biker Babe: Does she ever love her motorcycle!
- Boobs of Steel: Strongest of the Hinata household.
- Buxom Is Better: 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 chest.
- Gag Boobs: In the manga. The anime tones this down by still giving her big breasts, but of a more realistic size.
- Girlish Pigtails: You know it's summertime when Aki wears her hair like this instead.
- Hair Antennae
- 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.
- Meganekko: They're a rather tiny pair, but the trope still applies. It doesn't help that this and the above-mentioned Hair Antennae are usually the last two things one notices about Aki...
- Ms. Fanservice
- Sequential Artist
- Statuesque Stunner
Voiced by: Hisako Kyoda (Japanese), Linda Leonard (English) and 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.
Close Pekoponian Friends
Voiced by: Haruna Ikezawa (Japanese), Monica Rial (English) and 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.
- Can Not 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 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.
- Lonely Rich Kid: Until she met Fuyuki.
- Important Haircut: A Flashback in the manga shows that she gave herself one when her Split Personality emerged.
- 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!
- Shrinking Violet: Until her Split Personality takes over.
- Spikes of Villainy: Her hair does this.
- Split Personality: Momoka and Dark Momoka.
- Spoiled Sweet: Her 'good' side.
- 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.
Voiced by: Keiji Fujiwara (Japanese), Kent Williams (English) and 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.
- Badass Grandpa: In the dub he reminisces about Stalingrad.
- Badass Mustache
- Battle Butler
- Shout-Out: To Ken Masters.
- Worthy Opponent: He and Giroro consider each other to be this, or at least they did in Paul's debut episode.
Voiced by: Akira Ishida (Japanese), Joel McDonald (English) 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. Runs his own radio show, 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.
- 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.
- Covert Pervert: Strong undertones of this in the manga, bordering on Handsome Lech.
- 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.
- Green Lantern Ring: His pen.
- Mr. Fanservice
- Not So Different: Heavily implied in the manga that he can be just as mischievous as Kururu. He's just nicer most of the time.
- Odd Friendship: With Kururu; descibed as being "Wavelength buddies".
- Out of Focus: Frequently sees less action than the other human characters.
- 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
Voiced by: Ryo Hirohashi (Japanese), Luci Christian (English) 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
- 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
- Country Mouse: This is exaggerated in the English dub, but she's from a simple rural background in both versions.
- Hair Decorations: Her big red hair ribbon.
- 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
- 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.
- Romantic Two-Girl Friendship: With Natsumi. The manga takes this into full-blown Schoolgirl Lesbians territory, though still one-sided.
- Uncatty Resemblance: She and Dororo are both self-conscious ninjas obsessed with friendship. Dororo is considerably more broken and jaded than she is, however.
- Wide-Eyed Idealist
Voiced by: Keiji Fujiwara (Japanese), R Bruce Elliott (English) and José María Regalado (Spanish)Exactly What It Says on the Tin.
- Lemony Narrator: Cranks it up to eleven! 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.
- Butt Monkey: Is stuck working on a show he hates\doesn't understand.
- The Men in Black: Appears dressed as a Kuroko with a big red N over his face.
- 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) 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
- 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.
- Cosplay Otaku Girl: Seem to has fun dressing various cutesy costume.
- Dark-Skinned Blond: Her appearance deliberately invokes the 'kogal' trend; she based her human appearance off of a Deliquent girl she met once.
- 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 Pekopnian disguise makes her seem like this.
- 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'.
- Magical Girl: Her transformation sequences, stylized costume, and related accessories may make her a parody of the "magical girl" genre.
- Omnicidal Maniac: Played for Laughs.
- Really 700 Years Old
- Slept Through the Apocalypse: Exaggerated. She slept through the one she was supposed to cause.
- Simple 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.
- 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
- 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.
- The Exotic Detective
- Hot-Blooded: Lives and breathes this. He's literally hot blooded enough to melt ice.
- Large Ham: The largest one in the butcher shop.
- Shout-Out: He's a parody of Kenji Ohba, the star of a Toku series called Space Sheriff Gavan.
- Sibling Yin-Yang
- Stepford Smiler: He keeps on laughing, even when he's upset or angry.
Voiced by: Tomoko Kaneda (Japanese), Leah Clark (English) and 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.
- Cloud Cuckoo Landers Minder: For her very weird and very unusual brother.
- Petting Zoo People: Has cute bunny ears.
- Shrinking Violet
- Sibling Yin-Yang
- 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.
- Action Girl
- Clothes Make the Superman: She isn't particularly powerful without her father's help.
- Little Miss Snarker
- Emotionless Girl: Speaks blankly and apathetically and seems to not care about anything, but she really does feel deep inside.
- Heroic B.S.O.D.: She has this when Nebula was eaten by Chupacabra-like alien, even lost her sense of self-reservation.
- Girlish Pigtails
- 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.
- Pinocchio Syndrome: Interestingly, Nebula seems more interested in obtaining this for Alisa than Alisa is herself.
- Shapeshifter Weapon: Nebula.
- Unknown Rival: Unsurprisingly, Momoka hates her guts. She doesn't really know or care.
- What Is This Thing You Call "Love"?
- 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 Ohtsuka (Japanese)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.
- The Ace
- Aloof Big Brother
- 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.
- The Comically Serious
- Friendly Sniper: In the manga, is far nicer, friendlier, and enjoys gently teasing his brother, but is still a well-respected commander.
- Heavy Metal: His music of choice.
- Red Baron, Shout-Out: Nightmare of Keromon
- Stealth Mentor
- Weaksauce Weakness: One chapter reveals he can't use chopsticks. Unless spearing his food with them counts.
- Worthy Opponent
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.
- Cheerful Child
- Dissonant Serenity: After his first fight with Tamama, when he took out Paul and Momoka in short order.
- Eye Beams
- 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 genuiely 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?
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: A full half of his body, bisceted 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.
- Cyber Cyclops
- Evil Counterpart: Towards Dororo, whom he insists on calling 'Zeroro'.
- 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.
- Hollywood Cyborg
- 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.
- Not So Different
- 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.
- Big Eater
- Bratty Half-Pint
- For the Evulz/It Amused Me
- Insufferable Genius
- Mad Scientist
- Nerd Glasses
- 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.
- Playful Hacker
- Recruiting the Criminal: Didn't sign up voluntarily, but was drafted after Keron Force caught him poking around their systems.
- Smug Snake
- 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: Anime only
- Bratty Half-Pint
- Creepy Child
- Dissonant Serenity
- Lack of Empathy
- Put on a Bus: Manga only; the clone's ultimate fate is never detailed.
Chief Medic Pururu
Voiced by: Satsuki Yukino (Japanese)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 of Choice invokes this.
- Badass Adorable: She's a medic that can kick ass with her syringe.
- Combat Medic
- Corner of Woe: Triggered when someone calls her obasan (auntie/old lady) or makes any sort of reference to her age.
- Hospital Hottie: Triggers the usual "Hello, Nurse!!" reaction from Keroro.
- Girl with Psycho Weapon
- Improbable Weapon User: Syringes. Big ones.
- Older Than She Looks: About Christmas Cake level... in Keronian years.
- Small Girl Big Syringe
- "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 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.
- Large Ham
- Nice Hat: Always shown wearing an elaborate silver-and-gold helmet.
- Spikes of Villainy
- Split Personality
- 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.
- Art Initiates Life: With a snap of his fingers!
- Dub Name Change: Known as "Pumama" in Spain due to... language ordeals.
- Gratuitous English: His Verbal Tic: "Yeah! Yeah! Yeah! Yo! Yo! Yo!"
- Mad Artist
- Couldnt Finda Pen: His brush is actually a nyororo that uses Keronian fluids as ink.
Super Marionette Mekeke
Voiced by: ChoPutata's partner in crime and a master puppeteer who conceals himself via invisibility while fighting with his puppet.
- Marionette Master
- People Puppets: Another of his talents.
- Perverse Puppet
- Shout-Out: Basically he's one big reference to Kankurou.
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.
- 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.
- 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.
- Our Ghosts Are Different
- Red Right Hand: His scythe-arm.
- Talking to Himself: Shares his seiyuu with Dororo.
- 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.
- 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.
- Scarf of Asskicking
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.
- Heel–Face Turn: Almost results in Redemption Equals Death.
- Living Toys
- Puppet Permutation
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.
- Eye Beams
- Extra Eyes
- Faceless Eye: When he's in his invisible mode, he is sometimes only seen as one of his many eyes.
- Kick the Dog
- Red Eyes, Take Warning
- Slasher Smile
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.
- Enemy Scan
- Interplay of Sex and Violence: When Dororo delivers the final blow on Robobo, he seems to have a random orgasm before exploding.
- Killer Robot
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.
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.
- Retired Badass
- Like Father, Like Son: This is more evident in the dub, where Keroro's dad is a proud war criminal.
- Unnamed Parent
- "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.
- Doting Parent
- 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.
- Big Ol' Eyebrows
- Drill Sergeant Nasty: He fits this Trope rather nicely in the Chibi-Kero Short.
- Unnamed Parent
- Retired Badass
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...
- Apologises a Lot
- Beware the Nice Ones: Guess where Dororo got his ass-kicking genes from.
- Big Fancy House
- Doting Parent
- Generation Xerox
- Ill Girl: Wears a surgical mask like Zeroro.
- Shrinking Violet
- Shy Blue Skinned Girl
- Talking To Herself: She had Kumiko Watanabe's voice. And surprisingly not Ax-Crazy Yangire like in Victory Gundam
- Unnamed Parent
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.
- Cheerful Child
- Genki Girl
- Kansai Regional Accent
- Love Freak
- 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.
- Playing Against Type: Junko Noda doesn't usually voice Genki Girls often.
- Running Gag: Almost always falls for somebody else every time she shows up.
- Wide-Eyed Idealist
Voiced by: Natsuko Kuwatani (Japanese)Karara's fraternal twin sister. Doesn't appear as much or get as much character focus as her sibling.
- Cheerful Child
- 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.
- Genki Girl
- 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, much to the dismay of fandom.
- Ascended Fanon: Joriri was originally one of the fan designs submitted to the Keroro Land mangazine, before being incorporated into the tv show.
- 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.
- Red Eyes, Take Warning
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.
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.
- Ascended Extra: Starred in a one-shot side story in the manga; became a recurring character in the anime.
- Idol Singer
- 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.
- Spoiled Brat
- 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...
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.
- Attack of the 50-Foot Whatever
- Emotion Eater
- Person of Mass Destruction
- Sealed Evil in a Can
- 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: 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.
- Bratty Half-Pint
- Canon Immigrant: The storyline from the second movie was eventually adapted to the manga, including Meru in it.
- Jerk Ass: 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.
- Battle Butler
- Canon Immigrant: The storyline from the second movie was eventually adapted to the manga, including Maru in it.
- Extreme Doormat
- Morality Pet
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 Twin to Keroro
- 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 Friendship
Voiced by: Estívaliz Lizárraga (Spanish)
- Arrogant Kung-Fu Guy
- Evil Counterpart to Tamama
- Homage: 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 Dragonball's original ending and another one shows him in a place very similar to the Tenkaichi Budokai tournament from Dragonball, fighting against someone with the body obscured, but wearing pants and shoes identical to Yamcha's in the 22nd and 23rd Budokais.
- Weapon of Choice: A Simple Staff WITH LASERS.
Voiced by: Txemi del Olmo (Spanish)
- Blood Knight
- Evil Counterpart to Giroro
- 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.
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...
ShionOne 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...
- The Kid with the Remote Control: the ancient book that only Shion can read summons the Earth Dragon in the first place.
- The Ojou
TeraraWhen Shion attempts to breed the Earth Dragon egg hidden under Mont-Saint-Michel, the plan reaches frution and the massive Earth Dragon is hatched - but the destruction it causes to the world forces Shion to intervene, and eventually the Earth Dragon relinquishes its power, turning into a harmless little creature that resembles a salamander-based Keronian.
- Superpowered Evil Side: The Earth Dragon form, though it's officially sealed away by the end.
- Meaningful Name: Terara comes from 'terra', meaning Earth. Can also be read as referring to terror...
- Nice Hat: Shion's beret is passed to Terara at the end.