These are the characters from ''Shinryaku! Ika Musume'' and tropes that are associated with them.

This page is currently under construction. Any contributions are appreciated.


[[folder:Squid Girl]]
!!Ika Musume/Squid Girl

->'''Voiced by:''' Creator/HisakoKanemoto (Japanese), Creator/ChristineMarieCabanos (English, Media Blasters dub), Alice Beaver (English, Animax dub)

The "protagonist" of the series, an anthropomorphic squid-girl who comes ashore to invade the surface world in retaliation for constant human pollution of the seas, only to end up being forced to work as a waitress at the Lemon Beach House restaurant in order to pay for a damaged wall of the restaurant.
* AlienHair: Has tentacle-hair that she can control.
* AntiVillain: Technically a WellIntentionedExtremist ([[SlidingScaleOfAntiVillains Type III]]), but her traits are more akin to a Villain In Name Only ([[SlidingScaleOfAntiVillains Type IV]]).
* AppliedPhlebotinum: In Season 2 episode 2.3 it turns out that Ika Musume can pick up heavy weights with her tentacles because she can manipulate her weight using her bracelets.
** RequiredSecondaryPowers: It's eventually explained that the whole reason Squid Girl can pick up people and other heavy objects with her tentacles without losing her balance is that she can alter her weight with her bracelets, becoming heavy enough to anchor herself.
* BadassAdorable: Her silly antics make it hard to forget but those tentacles are capable of busting holes in walls... which is actually the reason she works at the Lemon Beach House in the first place.
* BetweenMyLegs: The shot used when she's introduced. The same introduction shot is used in the first and last episodes of both seasons. She also gets this shot in episodes 3 and 7.
* BrilliantButLazy: She's shown to be extremely good at math, has mastered several skills that have nothing to do with world domination, and of course there's her extremely powerful tentacles. She could at least be a serious threat, if she wasn't so lazy and easily distracted (and of course, if it weren't for Chizuru.)
* CardCarryingVillain
* ColdTurkeysAreEverywhere: After she swears off shrimp. They pop up everywhere.
* CombatTentacles: They are absurdly strong, faster than sound, can reach ludicrous lengths but are also precise to put a string into a needle. [[HealingFactor And they can regenerate just as fast.]]
* ComicallyMissingThePoint
* CryCute: Every time Chizuru intimidates her into obeying her, or whenever a "comrade" of hers (e.g. Takeru in a squid paper-hat and an umbrella) "dies" (Takeru's hat blown away, the umbrella ran over by a truck).
* CurtainsMatchTheWindow: And the tentacles.
* CuteClumsyGirl: Without the use of her tentacles she can barely kick a soccer ball.
* CuteMonsterGirl: A cute squid girl.
* DarkAndTroubledPast: Occassionally hinted at. It seems life in the ocean wasn't all that great for her. When Eiko mentions how Ika isn't picky at eating, she responds by saying in the ocean you can't afford to be picky, just being able to eat at all is reason to be happy. She later tells Takeru she had never had the opportunity to play with others until she came to the surface. She seems oddly depressed when these subjects are brought up.
* EvenTheGirlsWantHer: Ika is, in an appropriate and friendly way, friends with many kids of either gender, specifically Takeru and Kiyomi's respective groups of friends. Sanae and Cindy, on the other hand...
** In season 2 episode 9.1, Ika is asked by a little girl named Risa to join her play as ''her husband.'' Minutes later, Eiko, Sanae, and Kiyomi all join in. They have different roles but they share one similar thing: they '''LOVE''' Ika Musume. They even take their roles seriously and act as though they are ''genuinely in love with her.''
* FaceYourFears: In Season 2, Episode 11.3, [[spoiler:she overcomes her fear of Chizuru, accidentally ticks her off again, and ''gets dragged by her to a room while'' '''''showing NO signs of fear.''''']]
---> '''Ika:''' Oh? About what? [[spoiler:(while being dragged by Chizuru to a room)]]
* FishOutOfWater: It's what the show's about!
* GeniusDitz[=/=]SmallNameBigEgo: At her best, she is the former. At her worst, she is the latter.
* GenkiGirl: Extremely excitable.
* GodivaHair: Ika has this when she's in the bath.
* HeelFaceTurn: Not completely so, but it does happen as the series progresses.
* HumansAreTheRealMonsters: Her reason for invading the surface world. Her subsequent experiences, however, apparently start to impress to her that the situation is more like "HumansAreFlawed".
* HurricaneOfPuns: The dub version makes many puns related to undersea creatures. This is to match the original Japanese version's way of matching punnery in which she would emphasize the ''ika'' ("squid") in any phrase containing it (for instance, with ''-ja nai ka'' ["isn't it ____?"], with emphasis normally on the ''nai'', would be pronounced ''-jana-ika'').
* [[ICallItVera I Call It Squid Unit 1, Hyperion and Eyjafjallajökull]]: [[TearJerker Her]] [[ParasolOfPain umbrella.]]
** In a similar vein, [[ICallItVera Black Tiger, Black Tiger GT and Black Tiger Ticonderoga]], for her bamboo boat.
* IconicOutfit: Her cute white tunic with blue bracelets and matching shoes. So much so, that they have the ability to ''[[ExaggeratedTrope repair itself]]''.
* IneffectualSympatheticVillain: Ika Musume has CombatTentacles and a strong desire to conquer the human race. She has a bit of trouble getting to the conquering part however.
* InstantExpert: She's able to speak fluent English after a short lesson from Cindy.
* JerkWithAHeartOfGold: Underneath all of her rudeness she really is a good person.
* LaserGuidedAmnesia: In Season 2, Episode 7.2.
* LightEmUp: Like certain types of squid, she can emit light from her body.
** LightIsNotGood: And there is the fact of Ika being a VillainProtagonist, to [[SubvertedTrope help cleaning the sea]].
* ModernMajorGeneral:
-->'''Ika:''' "Why am I good at everything but invading?"
* MultiArmedMultitasking: Her tentacle-hair.
* MundaneObjectAmazement: Given her little knowledge of the human world, this naturally comes in.
* MundaneUtility: Her PrehensileHair is frequently used like an extra set of hands for carrying food.
** In fact, this is why she's given the job at the restaurant. Her delicious ink also helps.
* NeverBareheaded: And for a very good reason: it's mentioned that her "hat" is actually her life source. If it's removed, she dies. Luckily, removing it is pretty hard since it's fused to her scalp. Since she's a squid, it may actually ''be'' her scalp (it certainly looks like the top of a squid's head). She also provides the image for the trope page.
* NiceHat: It's more than just a NiceHat, she needs it to live.
* NoSocialSkills: Due to having lived in the sea before going up to the surface, this is a given.
-->'''Ika:''' "What's a military?"
* OffhandBackhand: To Sanae, every time she tries to glomp her.
* ParasolOfPain: In her imagination at least.
* PrehensileHair: While not actually hair, Ika Musume has highly prehensile tentacles growing out of her head, which look quite a bit like hair.
* PungeonMaster: In the dub, where she [[IncrediblyLamePun gets kraken]] with a bunch of fish puns instead of her verbal tic.
* RedEyesTakeWarning: She does this in the anime when she gets angry and unleashes her full power. Watch a brief example [[ here]].
* SickEpisode: Ika falls ill to a Squid Girl disease. Symptoms include nausea, headaches, flushes in the face, fever, delirium, and death...[[spoiler:ly cravings for shrimp.]]
** Again in Season 2 episode 8.3. Unlike in the first season, she appears to have a normal fever which she gets from Kiyomi.
* SitcomArchnemesis: Sometimes sees Goro as one.
* TakeOverTheWorld: Her ultimate goal. Too bad she has no idea as to the strength of all the world's military forces.
* TentacleRope: In one instance, Ika does this to Eiko when she wanders into Eiko's room and falls asleep there... Rather, her tentacles did this all on their own. Ika herself was already long asleep.
** Ika also does this as a self defense mechanism against Sanae and Cindy.
* TrademarkFavoriteFood: Shrimp. She has a separate stomach for it.
* {{Tsundere}}: A type A.
* UnusuallyUninterestingSight: No one save Nagisa ever takes notice of her strange appearance and PrehensileHair.
* UnwantedHarem: [[ Eiko and Isozaki come to realize this.]] Maybe not a true harem, but definitely unwanted.
* VerbalTic: ''-de geso~''. The English version of the anime translates this into frequent ocean life puns, apparently as an AscendedMeme from the fansubs.
* VillainProtagonist: Ika wants to take over the world because humans have been polluting the seas.
* VitriolicBestFriends: With Eiko. They bicker a lot, but sure do spend a lot of time together as well, and Ika plays Eiko's video games a lot as well.
* WhyDidItHaveToBeSnakes: Afraid of Chizuru's eyes, orcas and sharks. Those last two are TruthInTelevison, as orcas and sharks eat squids.
** [[spoiler: After the end of Season 2, Episode 11.3, it looks like Ika is not afraid of Chizuru anymore, even if she accidentally ticks her off again and ''gets dragged by her to a room.'']]
* WomanInWhite: Has a white dress.
* WorkOffTheDebt: Her "Punishment" for blasting a hole in the Lemon Beach House's wall.
* YouGottaHaveBlueHair: Has blue hair-like tentacles.

[[folder:Eiko Aizawa]]
!!Eiko Aizawa

->'''Voiced by:''' Creator/AyumiFujimura (Japanese), Heather Pennington (English Media Blasters dub), and Jessica de Borja (English, Animax dub)

Middle of the Aizawa siblings and manager of the Lemon Beach House, as well as Ika Musume's principal "handler".
* BodyguardBabes: She's like this towards Ayumi when she sees some [[CasanovaWannabe Casanova Wannabes]] try to flirt with her. She almost breaks one of those guys' arms off. Here's a quote from the same guy:
--> "Pain in the ass bodyguard!"
* BookDumb: Studying isn't her forte, but she's also too proud to ask Ika for help.
* CoolBigSis: For Ika, some of the time.
* DeadpanSnarker: To Ika.
* FieryRedhead: Quite short-tempered, particularly to Ika.
* GamerChick: Keeps a {{Famicom}} lookalike inside her room (in the anime it's a UsefulNotes/MegaDrive lookalike). Oftentimes Ika is her playmate.
** Also, in the OVA when The Three Stooges ask Eiko and Ika to try out their new handheld, Eiko says this:
--> '''Eiko:''' "Gaming is my life!"
* JerkWithAHeartOfGold: She's not a jerk per se, but given [[GeniusDitz Ika's]] [[SmallNameBigEgo behavior]], can we really blame her for sometimes being abrasive towards her?
* OnlySaneMan: Narrative-wise. She's also the person Ika interacts with the most.
* RedOniBlueOni: Red to Chizuru's blue.
* SailorFuku: Her high-school uniform.
* SeenItAll: Is unimpressed by Ika's grandstanding (until Ika proves she's really a squid) because she's met a lot of similarly rambunctious children during her job.
* VitriolicBestFriends: With Ika/Squid Girl. Despite the arguments they get in, they spend a lot of time together.

[[folder:Chizuru Aizawa]]
!!Chizuru Aizawa

->'''Voiced by:''' Creator/RieTanaka (Japanese), Creator/ShelbyLindley (English, Media Blasters dub), and Sarah Hauser (English, Animax dub)

Eldest of the Aizawa siblings.
* ADayInTheLimelight: [[spoiler: Season 2, Episode 11.3]] focuses on her [[spoiler:and her quality time with Ika.]]
** This is the first and only episode that is focused on her for this season.
* BadassAdorable: She's moe when not StaringDownCthulhu.
* BerserkButton: Her store and [[BigBrotherInstinct her siblings]].
** She has another one, as revealed in Season [[spoiler: 2, Episode 11.3: '''DO NOT EVER IMPLY THAT SHE'S INHUMAN!!!''']]
* BewareTheNiceOnes: Even Eiko is wary whenever she exudes an intimidating aura.
* CoolBigSis: To both Eiko and Takeru.
* CreepyBlueEyes[=/=]IcyBlueEyes: Has blue eyes, which Ika fears, and [[NightmareFace for a good reason.]]
* CurbStompBattle: And she's always on the winning side.
* TheDreaded: To Ika, who is deathly scared of her anger and eyes.
* EyesAlwaysShut: And when she opens them, expect a person or two cowering in fear.
** Though she actually looks pretty good when she opens them [[ without malicious intent.]]
* {{Flanderisation}}: In the early episodes she was extremely nice and rarely went berserk. By the end of the second season this behavior has almost gone to OnceAnEpisode territory.
* TheGadfly: Sometimes she does things because it might be ''fun''.
* MentorArchetype: Teaches [[spoiler: Ayumi]] the art of self-defense while having Goro ''as her punching bag''.
* MetaGirl: Quite possibly, being the only character of the series to acknowledge [[spoiler:the [[MilestoneCelebration three-hundredth chapter]] of [[ the manga]].]]
* MsFanservice: While wearing a one piece swimsuit, even, much to the delight of Goro.
* NiceGirl: Her default state. Annoy her and [[BewareTheNiceOnes she'll make you regret it for the rest of your life]].
* NightmareFace: Whenever her eyes are open.
* ObliviousToLove: For Goro. Though she may be aware of what he feels for her and ''uses it to her advantage.''
* OhCrap: The reaction she elicits from anyone who chances upon her scarier side.
** The first time Ika Musume sees Chizuru's scarier side, you can [[BringMyBrownPants hear some sort of liquid trickling in the background]]...
* PhysicalGod: Ika-chan's tentacles are supersonic and can ''punch through foot-thick concrete''; Chizuru can chop said tentacles in mid-flight ''with her bare hands......''
* RedOniBlueOni: Blue to Eiko's red.
* StepfordSmiler: Type [[AxCrazy Unstable]]. And how!
* SuperReflexes: She is rather agile, and effortlessly dodges Ika's tentacle attacks.
* TranquilFury: She never raises her voice when she's pissed: all she has to do is open her eyes and everyone around her starts groveling.
* WeightWoe: Her only weakness. Ika may have a chance of ''actually beating her'' using only this weakness, if she's smart enough to notice it.
** She is also concerned with her muscles, as [[spoiler:Eiko]] exploits it in an attempt to eat more meat.
* YouGottaHaveBlueHair

[[folder:Takeru Aizawa]]
!!Takeru Aizawa

->'''Voiced by:''' Miki Ootani (Japanese), Amanda C. Miller (English, Media Blasters dub), Jessica de Borja (English, Animax dub)

Youngest of the Aizawa siblings.
* AnimeHair: Has unrealistically spiky hair.
* CrossdressingVoice: If you look at his portrayers' names above, then yes.
* TheGenericGuy: [[LampshadedTrope Lampshaded]] when Squid Girl tries to draw the Aizawas using her tentacles (which she explains goes by her mental images of them.) Chizuru gets drawn as an oni, Eiko as a killer robot, and a more photorealistic version of himself.
* MadeOfIron: His very first appearance has him getting thrown around and slammed into the ground by Squid Girl's tentacles, only to get right back up and proclaim "That was so cool!"
* NotSoAboveItAll: Despite treating Ika like a playmate most of the time, Eiko notices that he's slowly learning to subconsciously control Ika -- which is easy enough, given her immense gullibility.
* OutOfFocus: In Season 2 Episode 10.1, ''Ika, Eiko, and Chizuru'' all forget about him while they try to eat as many cuts of meat as they can. Luckily, Chizuru has reserved some cuts (which she intends to eat herself) for him.

[[folder:Goro Arashiyama]]
!!Goro Arashiyama

->'''Voiced by:''' Creator/YuuichiNakamura (Japanese), Jason Wishnov (English, Media Blasters dub), and Dave Bridges (English, Animax dub)

A lifeguard and Eiko's childhood friend, who has his sights for Chizuru.
* AmbiguouslyBrown: His tan is justifiable with his career.
* {{Bishonen}}
* ChildhoodFriends: With Eiko. It is also through this friendship that he met and fell in love with Chizuru.
* DoggedNiceGuy: That includes getting his butt kicked by Chizuru.
* SitcomArchnemesis: Is sometimes seen as this by Ika.
* StalkerWithACrush: Not exactly a stalker, but he keeps lots of pictures of Chizuru.
* WalkingShirtlessScene: Given his job, this is to be expected.
* WhyDidItHaveToBeSnakes: Fears ghosts.

[[folder:Sanae Nagatsuki]]
!!Sanae Nagatsuki

->Voiced by: Creator/KanaeIto (Japanese), Creator/XantheHuynh (English, Media Blasters dub)

Eiko's neighborhood friend who has taken an obsessive liking to Ika.
* AbhorrentAdmirer: Well, she's actually cute, but this is how Ika sees her.
* BerserkButton: She is not an alien. [[ Do not forget that.]]
* CameraFiend: She takes a lot of pictures with them. She especially likes taking pics of Ika.
* ClingyJealousGirl: The mere sight of Ika having a friendly chitchat with Kiyomi and her friends made her exude a dark aura that made a chill run down Eiko's spine.
* CosplayOtakuGirl
* TheDitz: Not so bright.
* EvenEvilHasStandards: Despite Ika Musume's fears, Sanae won't take advantage of Ika when she's helpless from heatstroke.
* GenkiGirl: Almost even more so than Ika.
* TheGlomp: Subverted; she tries, only to get back-tentacled by Ika.
* HopelessSuitor: To Ika.
* LethalChef: The subject of chapter 383. Sanae's cooking comes out tasting bad, so she asks Chizuru for training to make it better. It ''still'' comes out tasting bad, so Chizuru decides what she needs is discipline, putting her through TrainingFromHell. At the end of it, she's able to break fifteen tiles with a punch ([[LampshadeHanging wondering what on earth this has to do with cooking]]), and tries cooking again. Unfortunately, we don't get to find out if she improved, because [[DamnYouMuscleMemory she reflexively breaks the table with a punch]].
* LipstickLesbian: Is highly gay for Ika, and not afraid to show it.
* LoveMakesYouCrazy: Turned UpToEleven in Season 1, Episode 10 part 2, when she tries to abstain from contact with Ika Musume. She begins to hallucinate Ika Musume is everywhere and everything; a little girl, a set of trash bags, even as the heads of lanterns.
* NoSenseOfPersonalSpace: The main reason why Ika dislikes her.
* SingleTargetSexuality: She's Camp Ikasexual.
* StalkingIsLove: To IKA.
* SuperReflexes: Shows this in OVA 1.2, when she rushes to the Lemon shop to take pictures of Ika, while also simultaneously dodging all of the latter's tentacle attacks.
* TooKinkyToTorture: Or at least willing to get beaten up by Ika.
* {{Yandere}}: She looks like this whenever she sees Ika chatting with another girl.

[[folder:Cindy Campbell]]
!!Cindy Campbell

->'''Voiced by:''' Creator/HitomiNabatame (Japanese), Creator/LauraPost (English, Media Blasters dub)

An American alien researcher who comes to Japan to investigate Ika.
* AlliterativeName: '''C'''indy '''C'''ampbell.
* AnimeAccentAbsence: In her introduction Eiko tried to speak in English with her (she tried and failed epically) until she revealed she could speak fluent Japanese.
** She was so fluent in Japanese she eventually discovered, much to her horror, that she speaks English with a Japanese accent.
** The accent is gone as of Season 2's 4.1, where she spends the whole segment speaking SurprisinglyGoodEnglish.
* {{Eagleland}}
* ForeignFanservice: A sexy blonde woman with a pony-tail, wearing a parka over a two-piece bikini or a tube-top and short shorts? Yes, please.
* HotScientist: A scientist, and very pretty.
* MadScientist
* PhenotypeStereotype: Blond and well-endowed.
* SingleTargetSexuality: Her obsession with Ika sometimes goes beyond finding her "alien heritage" and she's heading right in Sanae's direction.
* TooKinkyToTorture
* WalkingSwimsuitScene: Is almost always seen in her swimsuit.

[[folder:Nagisa Saito]]
!!Nagisa Saito

->'''Voiced by:''' Azusa Kataoka (Now Azusa Enoki) (Japanese), Creator/CristinaValenzuela (English, Media Blasters dub), and Jessica de Borja (English, Animax dub)

A surfer and part-time worker for Lemon Beach House, and perhaps the only person who sees Ika as a genuine threat to humanity.
* BerserkButton: [[ Don't take surfing lightly. Even if you're Ika Musume.]]
* {{Bifauxnen}}: Just sweeping her hair back is enough to make her look like a {{Bishounen}}.
* CrazyPrepared: She has a stack of notebooks detailing how to counter any invasion plans Ika comes up with. This includes tips for beating her at Othello. [[ Really good ones]].
* DemotedToExtra: She became a background character from Season 2 Episode 2 through to Episode 11, to the point of not appearing in a few episodes. Poor girl.
* EvenTheGirlsWantHer: Enough to make most, if not all, of the girls squee for her in Season 2, Episode 2.2.
* OnlySaneMan: Usually.
* [[SurferDude Surfer Babe]]: And she [[SeriousBusiness takes it seriously]].
* WhyDidItHaveToBeSnakes: The only one who does believe Ika might take over the world.

[[folder:Ayumi Tokita]]
!! Ayumi Tokita

->Voiced by: Creator/AyakoKawasumi (Japanese), Creator/SarahWilliams (English, Media Blasters dub)

Daughter of the manager of Southern Winds, Lemon Beach House's rival restaurant from a neighboring town. She sometimes works part-time at the Lemon Beach House.
* AntennaHair
* BeautifulAllAlong: Without those creepy "Fake Ika Musume" ''kigurumi'' masks her father has her wear.
* BewareTheNiceOnes: After episode 10.2, you better show some manners while talking to her, as her father finds out after ''she throws him down.'' Though that one is an accident. She learns self-defense from ''Chizuru''. Yes, ''that'' '''''[[MentorArchetype CHIZURU!]]'''''
* BodyguardCrush: While very subtle, it's implied that she may be this for Eiko as she tends to be very shy and bashful towards her.
* DefrostingIceQueen: Her father tells Eiko, Chizuru, and Ika that ever since she started working with them, her sociability has been improved. [[DoesNotLikeMen She's still afraid of men though.]]
* DudeMagnet: A lot of men love her.
* TheFaceless: Not exactly with her appearance (she's even actually quite the looker), but she's this personality-wise; as her father told Eiko, she cannot actively interact with people outside her masks.
* MadScientistsBeautifulDaughter
* {{Meido}}: In Chapter 162 (Season 2, Episode 2.2 in the anime), she is this while working at the store and while wearing ''bladed brass knuckles!'' Needless to say, male customers are petrified at the unusual sight.
* NotGoodWithPeople: Chapter 210 reveals she can speak normally with Ika, because ''she doesn't consider her human''.
** And again in chapter 212 to CHIZURU.
** Another in her list is [[spoiler:Sanae in chapter 216]].
* TheQuietOne: Doesn't talk to others without masks.
* ShrinkingViolet: Too afraid to talk to other people when she isn't wearing a mask.
* SpeaksFluentAnimal: Can understand animals like Alex, or at least claims she can. [[ The others hope it's true.]]

[[folder:Mr. Tokita]]
!!Mr. Tokita

->'''Voiced by:''' Rikiya Koyama (Japanese), Creator/TonyOliver (English, Media Blasters dub), Victor Lee (English, Animax dub)

Ayumi's father whose first name is unknown. He is the Southern Wind's owner. He is fond of making creepy kigurumi based on Ika.
* JerkWithAHeartOfGold: He means well and he's generous, but he's one helluva grumpy old man.
* MadScientist: His Ika kigurumi are both cute and creepy, but creepy most of the time. He even has built a ''toilet room'' out of them.
* NightmareFuelStationAttendant
* NoNameGiven: His first name is never revealed.
* NoSocialSkills: His only method of communication is to bark out orders at people in an unpleasant manner.
* VillainTeamUp: With Harris, Clark, and Martin. All of them are not really villainous; ''only to Ika.''

[[folder:Harris, Clark and Martin]]
!!Harris, Clark and Martin

->'''Voiced by:''' Seiji Sasaki, Creator/AnriKatsu, and Tetsuo Goto (Japanese); "Phineas", Creator/TonyOliver, and Jonathan Meza (English, Media Blasters dub); Victor Lee, Unknown, and Unknown (English, Animax dub)

A trio of American {{Mad Scientist}}s and MIT graduates who, together with Cindy, investigate Ika.
* {{Eagleland}}
* GeekPhysiques: Harris is a little skinny, Clark is ''very'' skinny, and Martin is fat.
** When Ika is gone in episode 12.1, they become depressed -- Harris and Clark gain a ton of weight, while Martin loses quite a bit.
* GratuitousEnglish: Humorously, a few of their Gratuitous English lines go unaltered in the English dub. "You're a god, man! We are god men!"
* MadScientist
* NightmareFuelStationAttendant: Especially in chapter 113.
* ReedRichardsIsUseless: In their zeal to discover Ika's "alien" heritage, they conveniently overlook their other, far more important discoveries: a universal language translator ''and'' a cure for cancer. Being that we actually learn this ''from them'', they appear to have some faint awareness of the fact that they're squandering their talents and discoveries
** Probably they finance their wild-alien chase with the patent-money they get from these inventions?
* ThreeStoogesShoutOut: Their InSeriesNickname
* VillainTeamUp: While they are not really villainous, the trio and Ayumi's father join forces in Season 2, Episode 11.2 to build a [[RobotMe Mecha-Ika Musume]]. This Mecha-Ika has almost all of the original's powers as well as the ability to speak.

[[folder:Kiyomi Sakura]]
!!Kiyomi Sakura

->'''Voiced by:''' Kokoro Kikuchi (Japanese), Creator/CarrieSavage (English, Media Blasters dub), Jessica de Borja (English, Animax dub)

A middle-school student who Ika befriends after a prank gone wrong.
* [[spoiler: ACupAngst: She is so angsty about it that her original wish for UsefulNotes/{{Tanabata}} is to ''have a bigger bust.'']] Kinda odd for a sweet girl such as herself.
* TheChick: Chapter 387 shows she's the one who holds the Invasion Club together; without her, they descend into acrimony.
* {{Meganekko}}: Wears glasses.
* NiceGirl: [[ Clearly seen]] in Chapter 185 of the manga, for example.
* TheRival: Sanae sees her as this. Of course, this has something to do with [[LoveTriangle Ika.]]
* SailorFuku
* SickEpisode: At the end of Season 2 episode 7.3.

[[folder:Tatsuo Isozaki]]
!!Tatsuo Isozaki

->'''Voiced by:''' Shinzou Miyasaka

Goro's friend and fellow lifeguard who tries to flirt with Ayumi.
* AmbiguouslyBrown: Like Goro, his tan is justifiable with his career.
* CasanovaWannabe: Tries to flirt with Ayumi, much to the annoyance of Eiko.
* StalkerWithACrush: To Ayumi.
* WalkingShirtlessScene: Almost always seen without a shirt.

[[folder:Keiko Furukawa]]
!!Keiko Furukawa

-->'''Voiced by:''' Misato Fukuen (Japanese)

A policewoman who, despite what her job entails, is kinda incompetent.
* CuteClumsyGirl: So clumsy despite being a cop.
* [[{{Manchild}} Womanchild]]: Is not ashamed to join a water gun fight with Squid Girl and the other kids.
* PoliceAreUseless: She was once held hostage when she accidentally cuffed herself detaining a criminal, and Squid Girl has saved her on more than one occasion.
* WalkingSwimsuitScene: In one chapter, she changes from her police uniform into a bikini to stand out less. Unfortunately, that just makes her stand out even more.

[[folder:Kozue Tanabe]]
!!Kozue Tanabe

->'''Voiced by:''' Creator/AkemiKanda (Japanese) and Erika Harlacher (English, Media Blasters dub)

A gentle girl that Squid Girl meets one day on the beach.[[spoiler:Implied to be an anthropomorphic "tako musume" (octopus girl)]].
* AmbiguouslyHuman: Her hat is commented to be as odd looking as whatever Ika has on her head...
* HumansAreFlawed: Her basic philosophy, which she sometimes shares with Ika.
* LastEpisodeNewCharacter: More like the Last Episode [[spoiler:Octo-]]Girl of the show. She has only appeared in the last episodes of Season 1 and 2.
* MeaningfulName: [[spoiler:'''Ta'''nabe '''Ko'''zue. "Tako" is Japanese for octopus.]]
* MysteriousStranger
* NiceGirl: Usually nice and sweet to others.
* [[spoiler:ThereIsAnother: Is hinted to be an octopus girl.]]