The following is a list of characters and tropes that apply to them in Manga/ArpeggioOfBlueSteel. Do note that TheOtherDarrin is in full effect, as the drama CD and anime uses an entirely different set of voice actors. Note that due to the anime diverging from the manga's storyline, some characters' tropes will be a mix from either media.

[[foldercontrol]]

!Blue Steel

The main characters. On paper an [[Main/PrivateMilitaryContractors independent firm]] that also does some work for the Japanese government, at the beginning of the series Blue Steel is the only force that has a real chance at striking back against the Fog Fleet blockade of the Japanese islands. They are eventually hired by the Central government to deliver the blueprint of a weapon that might finally turn the tide in humanity's war against the Fog to the only country still capable of producing it in the numbers needed: the United States of America.

Commanded by Gunzou Chihaya, and manned by some of his classmates from the Maritime Institute, Blue Steel's ability to fight the Fog Fleet on (somewhat) even terms is mostly due to the fact that it has its own Fog ship under its disposal: the renegade Fog submarine I-401, Iona, who follows Gunzou for reasons even she herself isn't quite sure of.

[[spoiler:Initially just composed of Iona, Blue Steel becomes a fleet once Hyuuga and Takao switch sides, but only Takao has a ship to contribute. In the ''Ars Nova'' anime Haruna and Kirishima also end up joining]].

[[folder:Members of Blue Steel]]

!!Gunzou Chihaya
http://static.tvtropes.org/pmwiki/pub/images/gunzouarpeggio_5709.jpg
->Voiced by: Creator/JunFukuyama (Drama CD), Creator/KazuyukiOkitsu (Anime)

The Captain of I-401, and he makes most of the tactical decisions of Blue Fleet in general.
----

* BadassInANiceSuit: He generally wears a primarily black suit and red shirt when meeting with clients. In ''Ars Nova'' he wears the suit all the time.
* TheCaptain
* ChickMagnet: Both human girls and Fog ships are attracted to him, though (probably) for different reasons.
* ChildProdigy: He was one of the top students in his class back when he was studying to join the navy.
* CombatPragmatist: He's willing to do whatever it takes to win a battle. Considering his opponents are nigh-invulnerable warships who gave humans a CurbStompBattle they still haven't recovered from, it's not surprising he's forced to think outside the box with I-401.
* DesperatelyLookingForAPurposeInLife: The revelation that his father was a traitor and losing his childhood friend Amaha Kotono in a fire causes him to become this until he meets Iona.
* DisappearedDad: His dad, a war hero who captured the I-401 during the final naval battle between the UN Fleet against the Fog Fleet, was presumed dead after leaving Japan in I-401 which later returned without it's crew. However, two years before the series began, Gunzou learns not only is his father and his crew alive but they defected to the Fog Fleet.
* {{Expy}}: With his good looks, daring strategic mind, and [[Creator/JunFukuyama identical voice]] (not to mention possessing a MysteriousWaif MacGuffinGirl), drawing comparisons between Gunzou and [[Anime/CodeGeass Lelouch]] is practically inevitable.
* IntelligenceEqualsIsolation: At first, during the academy. He still has trouble relating to people but is surprisingly comfortable speaking with Fog Mental Models.
* ObliviousToLove: It's doubtful that he had any idea he had two girls swooning over him during school. One still is, the other [[spoiler:died in a terrible fire... ''[[NeverFoundTheBody maybe]]'']]
* RedBaron: Called the "Battleship Killer" and "Route Holder" in chapter one.
* TheParagonAlwaysRebels: While not exactly top of the class, he qualifies for this in the merit of always being in the top three at school and is quite a decent captain even compared with those with more experience. End result? Deserted the military, taking a few of their most talented personnel with him, and starts work as a mercenary.
* TheStrategist: He comes up with some rather unique tactics during combat to win against his opponents.
* XanatosSpeedChess: Routinely changes plans on the fly based on new information or depending on how event play out. This ability is what makes Blue Steel, and himself in particular, such a threat to the Fleet of Fog.

!!Iona/I-401
http://static.tvtropes.org/pmwiki/pub/images/ionaarpeggio_9625.jpg
->Voiced by: Creator/AoiYuuki (Drama CD), Creator/MaiFuchigami (Anime)

A Fog ship somehow captured by humans in the Great Naval Battle seventeen years ago. While her origins are undoubtedly of the Fog fleet, she has no idea what her purpose was, other than to find and obey Gunzou Chihaya.
----
* AdaptationDyeJob: She has white hair in the manga, while it has more of a blueish tint to it in the anime.
* AmnesiacHero: She only remembers one order, which was to obey Gunzou Chihaya. This served extremely useful for the humans, who are finally able to fight back against the Fog ships for the first time since their appearance.
* {{Badass}}: While she doesn't appear to be one at first glance, she is a pretty effective fighter with the help of Gunzou and the other humans. ''How'' this badassery is shown varies depending on the media -- the anime mostly focuses on the ''physical'' abilities of her Mental Model (more or less taking over Haruna's role during the assault on the Okasabe mansion), while the manga focuses on her leadership and abilities as a strategist (as evidenced by her taking command of Blue Fleet against Hiei and her escorts while Gunzou and Hyuuga were away).
* BarbieDollAnatomy: During her introduction to Gunzou in the manga, Iona pretty much featured this during her NakedFirstImpression. Justified as we see her part-way through forming her body and the only part that's finished is her face.
* CharacterExaggeration: In the anime, Iona is much more of an EmotionlessGirl, and angsts much more about her status as a Fog vessel.
* CoolBoat
* DetachedSleeves: Her default outfit in ''Ars Nova''. She's fond of casual t-shirts and shorts in the manga.
* EmotionlessGirl: She's very stoic and calm and rarely shows strong emotions. The anime makes her even more emotionless.
* LittleMissSnarker: Iona in the manga has a pronounced and sometimes downright sarcastic sense of humor, particularly with Hyuuga.
* IAmWho: In both the anime and the manga, there are enough hints that Iona ''isn't'' simply a rogue Fog submarine, though both differ in the details: [[spoiler:the anime points to Iona being an avatar of the Admiralty Code, the architect of the Fog Fleet, while the manga instead hints that she's the Joint Tactical Network itself.]]
* MyMasterRightOrWrong: Despite being a Fog ship, she only remembers one order, to obey Gunzou. This brings a lot of conflict to other Fog ships she ends up fighting, most of all Kongou.
* MysticalWhiteHair: She has white hair, which hints at her being a Fog ship.
* RapunzelHair: She has waist length hair.
* ReiAyanamiExpy: An EmotionlessGirl with white hair and pale skin who is actually the Mental Model of a Fog Ship. This is even more emphasized in the anime, where she's even more emotionless and has blueish hair.
* ScrewTheRulesImDoingWhatsRight: [[spoiler:In episode 10, after suffering from a surprise attack from I-400 and I-402, I-401 begins to break down from sinking into the ocean. Gunzou orders her to gradually cut power to parts of the ship, and eventually orders her to cut off life support functions to preserve her remaining energy. Although she usually follows his orders without question, in this instance she became very conflicted about whether to save him, or let him die and continue the mission of getting the vibration torpedoes to America. So she instead decides to jettison her core and himself in a life pod in an attempt to hold out a bit longer, and fortunately for her, Takao finds them and gives up her nanomaterials to ensure both of them survive.]]
* SelfDuplication: She has one main form and several numbered clones running around the submarine, taking care of various tasks.
* SkirtOverSlacks: In her usual outfit
* SpaceshipGirl
* TheStoic
* SugarAndIcePersonality
* TalkingToHerself: With her other triplet sisters in the drama CD. In the anime each of the 400-series subs has their own voice actress.
* UndyingLoyalty: In episode 10 of ''Ars Nova'', she's very conflicted with Gunzou's order to leave him to his fate to save herself and the weapon plans. So she takes a risk in scuttling the remainder of her ship, and jettisoning him in a life pod with her core inside of it. [[spoiler:Fortunately Takao finds them shortly afterwards and sacrifices her ship and nanomaterials in order to allow Iona to rescue Gunzou.]]

!!Sou Oribe
http://static.tvtropes.org/pmwiki/pub/images/souarpeggio_7745.jpg
->Voiced by: Creator/TomokazuSugita (Drama CD), Shinobu Matsumoto (Anime)

The First Mate of I-401, Sou generally provides inventory of their supplies as well as aiding Gunzou with tactical decisions.
----

* CoolMask
* MrExposition: Particularly in the early chapters as [[AsYouKnow briefings to the other crew]] so the reader can familiarize themselves with some of the terminology and concepts used in the rest of the series.
* NumberTwo
* TheBlank
* TheFaceless: Always has his helmet on. He claims it's easier to contain his allergies this way.
* TheGraphShowsTheTrend: He loves them.
* TheUnreveal: He's taken off the mask once in flashback but we only see [[OOCIsSeriousBusiness Gunzou's reaction]].

!!Kyouhei Kashihara
http://static.tvtropes.org/pmwiki/pub/images/kyouheiarpeggio_596.jpg
->Voiced by: Creator/MinoruShiraishi (Drama CD), Eiji Miyashita (Anime)

Weapons officer of I-401, Kyouhei is generally most active when they are fighting an enemy.
----

* BigEater: Not so much in quantity as frequency: it's a common sight to see him eating some kind of snack while others are talking. He's even got a cooler installed at his workstation!
* CoolShades
* TheGenericGuy: Compared to the others, at least. All of the human officers who came from the nautical school belongs to the top ten of their class with the sole exception of Kyouhei, who ranks consistently... ''in the 200's.'' He ranked in top 5 in weapons training though, so his position in the crew is justified.
* HiddenDepths: He might be a goofball weapons specialist, but there's been hints that Kyohei is a bit of a history nut.
* HotBlooded
* {{Otaku}}: A mild case, since only him and Iona watch anime aboard the ship.

!!Iori Watanuki
http://static.tvtropes.org/pmwiki/pub/images/ioriarpeggio_4916.jpg
->Voiced by: Creator/AkiToyosaki (Drama CD), Minami Tsuda (Anime)

The Engineer of I-401, she does humanly-possible maintenance aboard the ship.
----

* CuddleBug: Is sometimes seeing hugging Iona or her mini metal models.
* {{Gainaxing}}: Occasionally.
* GirlishPigtails
* ScottyTime: [[spoiler:Almost]] Always ahead of every engine failure, breakdown or last-second power boost needed. Which is ''really'' handy, because it happens a lot.
* TheEngineer: Of the Mechanic variety.
* WrenchWench: Comes with being the engineer.

!!Shizuka Houzumi
http://static.tvtropes.org/pmwiki/pub/images/shizukaarpeggio_2506.jpg
->Voiced by: Creator/NaoTouyama

The sonar operator of I-401, she plays the crucial role of locating various hazards outside the sub via sonar.
----

* BewareTheNiceOnes: Oh hell yes. [[spoiler:Who would have ''ever'' thought that she is skilled in '''''guerrilla warfare''''' prior to the Iwojima invasion arc?!]]
* HimeCut
* {{Meganekko}}
* MysteriousPast: Apart that she was Maruri Hibiki replacement, her past is still a mystery but there's hints she spent time on Taiwan.
* TheQuietOne

!!Takao
http://static.tvtropes.org/pmwiki/pub/images/takaoarpeggio_3293.jpg
->Voiced by: Creator/RinaSato (Drama CD), Creator/ManamiNumakura (Anime)

Heavy Cruiser of the Fleet of Fog, she is the first named Fog ship Blue Steel battles and defeats (though chronologically speaking that honor would go to Hyuuga) in the series. When she is surprisingly let go by Gunzou in the wake of that battle, she develops a girlish fixation on Blue Steel's commander and, by extension, Humanity in general, to the point where she literally goes AWOL from the Fog Fleet.

Takao herself is the main character of the manga spinoff '''Salty Road''', which focuses on what she's been up to at Yokosuka, along with her minders Zuikaku and I-402.
----
* CanNotSpitItOut: Attempted to make a love confession to Gunzou... and [[CrowningMomentOfFunny failed miserably]].
* CombatPragmatist: Something she learned from Gunzou
* HeelFaceTurn: Runs away from the Fog and joins Blue Steel.
* HeroicSacrifice: Anime-only: [[spoiler:She uses the remainder of her nanomaterials to restore Iona back into working order, though she loses her ship and her Mental Body in doing so.]]
** [[spoiler:Averted: Her core survived and she is still able to at least turn up on screens or as projections on board the ship. Her mental model is fully restored during the last episode episode credits.]]
* InSeriesNickname: Tsundere Heavy Cruiser. Sees regular use by the Yamato-aligned Fog Ships like I-402 and Zuikaku.
* InstantCosplaySurprise: Is on the receiving end of several rapid-fire costume changes courtesy of Yamato. Notable in that the switches really are instant, illustrating just how out of her league Takao is against Yamato.
* IWantMyBelovedToBeHappy: [[spoiler:In episode 10 of the anime, she sacrifices her ship and mental model after she locates the remains of I-401, and a barely alive Gunzou inside a lifepod with Iona's core inside.]]
* MacrossMissileMassacre: Deals one and takes one.
* RapunzelHair: Though it is not directly visible because her ponytail is usually put up in a complex corkscrew.
* RedAndBlackAndEvilAllOver: She's the series StarterVillain, and her ship's sinister red-and-black colour scheme means she looks the part, but she promptly performs a HighHeelFaceTurn and turns blue.
* ShesGotLegs: More prominently displayed in some of the [[http://static.tvtropes.org/pmwiki/pub/images/takaoarpeggio_498.png anime artwork.]]
* StalkerWithACrush: To Gunzou.
* StarterVillain: She's the first Fog warship the I-401 has a proper on-screen battle against. [[HighHeelFaceTurn The 'villain' bit doesn't last long, though.]]
* ThemedAliases: The surnames that Takao used during her forays into human society reflect the aliegances she had at that point: '''Kirino''' (literally "of the Fog") after the first time she was defeated by Gunzo, and '''Aoki''' (can be read as "pure blue") after she had fully aligned herself with Gunzou and Iona's Blue Fleet.
* {{Tsundere}}: She's a Sweet type, which is acknowledged by most characters. She'll be gentle and nice but '''do not''' make fun of her.
* SelfDuplication: Like Iona, she too has several mini models that helps her in doing mundane tasks.
* UnlimitedWardrobe: Like all mental models, she can change clothes as she wishes, but she's one of few who doesn't stick to one set.
* YouGottaHaveBlueHair: She has blue hair.

!!Hyuuga
http://static.tvtropes.org/pmwiki/pub/images/hyuugaarpeggio_1374.jpg
->Voiced by: Creator/SakiFujita (Anime)

Former flagship of the Fleet of Fog Second Oriental Fleet. Sunk by Blue Steel before the events of the series and took up a job as port operator on Iwo Jima
----
* CatSmile
* ExcuseMeWhileIMultitask: Her schtick in ''Ars Nova''. She can quite easily [[spoiler:fend off rockets while talking to Kongo across Iwo Jima and]] talk to Makie while fighting Takao for [[ItMakesSenseInContext food]].
* GadgeteerGenius: For one thing, she built an army of robots, after extracting the raw materials from the Earth herself, since she didn't want to use nanomaterials. She's also built a set of "Option Ships" Iona can [[CombiningMecha dock with for a major power boost]].
* GeniusBruiser: She commonly acts as TheSmartGuy for Blue Steel but make no mistake, she's all but unstoppable in a fight against anyone who's not another Mental Model.
* GenkiGirl: Acts this way towards Iona frequently.
* TheGlomp: She loves doing this to Iona.
* HighClassGlass
* HotScientist
* LabcoatOfScienceAndMedicine: Her signature style. It doubles as a BadassLongcoat and since it's made of nanomaterial she can alter how long it is, which she does [[http://mangafox.me/manga/aoki_hagane_no_arpeggio/v06/c034/12.html purely for dramatic effect]].
* LoveAtFirstPunch: With 12 corrosive torpedoes.
* PowerFist: Chapter 34 of the manga gives her a pair of '''huge''' ones, each bigger than her torso.
* RocketPunch: The aformentioned power fists.
* StalkerWithACrush: To Iona.
* ShipperOnDeck: [[JustForPun Ships]] Gunzou and [[spoiler:Takao]]. Mostly because she wants Gunzou away from Iona so she get have her herself.

[[/folder]]

!The Fleet of Fog (Japan)

The segment of the Fog Fleet blockading the Japanese islands, the Mental Models of its ships are the only ones the audience has met so far. Ostensibly under the direct command of Superbattleship Yamato, the responsibility for actually maintaining the blockade falls under Flagships Nagato (First Fleet) and Kongou (Second Fleet).

[[spoiler:As the series progresses, the Fleet of Fog is starting to fracture over ideologies and interpretations of their orders. Musashi has formed a sub-fleet with human crews in Europe; Hood is collecting support from her subordinates to oppose Musashi as violating the Admiralty Code; Kongou is getting fed up with humanity's recent successes while Nagato seems more interested in playing both sides ForTheLulz. Meanwhile Yamato is planning ''something''.]]

[[folder:Members of the Japanese Fog Fleet]]

!!Yamato

Supreme Flagship of the Fleet of Fog, and chronologically the first among the Japanese Fog Fleet to gain a Mental Model. Disappeared without a trace during the Great Naval Battle seventeen years ago, made an unexpected return to the fleet two years before the start of the story with a Mental Model. It was her decision for other Fog warships to generate Mental Models as well.

[[spoiler:As Hyuuga and Takao soon discover, Yamato's mental models look ''exactly'' like Kotono Amaha, Gunzou's childhood friend, who was believed to have died two years prior.]] This casts her keen interest on Humanity in general, and the activities of Iona and her crew in particular, in an altogether new light, especially since (in the manga anyway), it was Yamato herself that "suggested" to Iona to seek Gunzou out.
----
* LadyOfWar
* MysteriousBacker: Not that Gunzo and his crew are any wiser, but Yamato is this to them, to the point where she assigns Yukikaze to keep an eye on Iona, discretely of course.
* OrcusOnHisThrone: Yamato has yet to do much of anything all series save for pointing people where she wants them to go. You just know that when she's ready to make her plans known, it's going to be ''big''.
* PerpetualSmiler
* SingleMindedTwins: Averted. Unlike Nagato, Yamato's two Mental Models display distinct personalities, with one still acting like prim and proper princess, and the other... [[spoiler:acting exactly like Gunzou's dead childhood friend Kotono Amaha]].
* TheChessmaster: Yamato is planning ''something''. She's not saying what that something is, but she's been encouraging select subordinates to spend time learning about humans.
* TheOjou
* Troll: In the [[BonusMaterial very non-canon extras]] included in each manga volume, Yamato takes particular pleasure in trolling her subordinates I-400 and I-402.
* WorthyOpponent: Respects humanity due to their strategic skills and will to keep fighting the Fleet of Fog despite the odds.

!!Kongou
http://static.tvtropes.org/pmwiki/pub/images/kongouarpeggio_8933.jpg
->Voiced by: Creator/HoukoKuwashima (Drama CD), Creator/{{Yukana}} (Anime)

Flagship of the Second Oriental Fleet (Third Oriental Fleet before reorganization)
----
* EmotionlessGirl: Is this, and believes that all Fog ships should be this. Downplayed in the manga where she's more TheStoic.
--> "We are weapons. Weapons have no need of emotions."
* EstablishingCharacterMoment: In the prologue for Episode One of the anime, a bit of the Last Great Battle is shown. In it, Kongo is shown at the head of the line (distinguished by her purple glow), and engages the human ships via [[RammingAlwaysWorks ramming]] them, hinting at the brute force method of solving problems she will exhibit later on.
* GracefulLadiesLikePurple
** PurpleIsPowerful
* ImplacableWoman: She becomes extremely obsessed with Iona and attempts to sink her at all costs.
* IronLady
* [[LickedByTheDog Liked by the Birds]]
* MidseasonUpgrade: In the manga. She gains access to Flagship Equipment care of Akashi, which aside from giving her a nice new gown and hat, turns her into a one-woman ZergRush: she is able to "transport" Fog Vessels from other parts of the Japanese archipelago to her location, giving them new bodies to transfer their cores to. In essence, a battleship-sized 3D printer.
* MyMasterRightOrWrong: While she dislike Yamato's idea that the Fleet of Fog should have Mental Models and humans to help them in their goals, she nevertheless obeys Yamato.
* RedEyesTakeWarning
* TheStrategist
* TheStoic
* TookALevelInBadass: In her early appearances Kongou seemed almost lazy, content to keep the status quo and watch the seabirds. After losing at least five ships [[note]] Nagara, I-501, Takao (AWOL), Haruna, Kirishima, Maya is arguably a sixth since she's on extended loan[[/note]] to Iona and crew, Kongou has finally had enough and is going ''all out''. Cue her MidSeasonUpgrade and the summoning of her entire fleet with the express purpose of sinking Iona.
* ShesGotLegs: The art rarely misses an opportunity to show them off.
* [[spoiler:VillainousBreakdown: She gradually starts to act in ways that causes I-400 and I-402 to question her loyalty. Then in episode 10 of the anime, her ship is locked down by the two subs, and she also finds out that Maya, her last friend/ally, was an AI construct designed to spy on her.]]

!!Haruna
http://static.tvtropes.org/pmwiki/pub/images/harunaarpeggio_3902.jpg
Battleship of the Fleet of Fog.
----
* BadassLongcoat: A rather intimidating AllEncompassingMantle variant. Its badassery is acknowledged in-universe as well - wearing it gives Haruna a significant confidence-boost. [[note]] Not really. Supplemental material in the manga reveals that losing the coat actually reduces her processing power by 100%. Losing it drastically reduces her capabilities. That said, the page in question was written ''very'' tongue-in-cheek and revealed a series of secret pockets on the inside filled with mostly useless items like snacks.[[/note]]
* CoatCape: It covers her entire body, and most of the time only the upper part of her head is visible.
* ChickMagnet: She attracts Makie and Maya very naturally.
* CryCute: When her coat is taken away, and when conseling with Makie.
* DefrostingIceQueen: She's gone from borderline EmotionlessGirl to simply TheQuietOne. Time will tell if she softens to anyone but Makie or Kirishima, but now that she's joined the naval academy (undercover) [[spoiler:she's not even wearing her coat!]]
* GirlishPigtails
* HeelFaceTurn: Saving Makie definitely counts, though she does not want to join Blue Steel.
* HiddenHeartOfGold: She might seem stoic, though she does not hesitate when Kirishima or Makie is in danger.
* MamaBear: Woe betide those who would harm Makie. Her destruction of an entire army division with armored support was ''holding back''.
* OneManArmy: She goes VideoGame/DynastyWarriors style on invading human soldiers and vehicles when Makie is threatened.
* SleepCute
* RedOniBlueOni: Blue to Kirishima's red.
* InstantCosplaySurprise: By Makie.
* TheStoic: Most of the time, especially when her mouth is covered by the collar of her coat.
** NotSoStoic: Without her coat, or if her mouth is visible. Not even the coat could hide her emotion when Doctor Osakabe died.
* TookALevelInBadAss: After losing her ship body.
* VillainousBreakdown: [[spoiler:Professor Osakabe's death]] sends Haruna's emotions into a destructive feedback loop. She very nearly launches an annihilation attack on all three Japanese capitals before [[DeusExMachina the Admiralty Code steps in]].

!!Kirishima
http://static.tvtropes.org/pmwiki/pub/images/kirishimaarpeggio_7611.jpg
Battleship of the Fleet of Fog.
----
* BadassLongcoat: In the manga.
* BareYourMidriff: Her original, post-sinking outfit in the manga was a BadassLongcoat and matching business suit which only buttoned from the collar to her sternum, leaving her midriff in full view. Her outfit in the anime, despite being more revealing elsewhere, only had a thin strip of skin showing between her trousers and shirt top.
* ButtMonkey: Poor Kirishima often gets the short end of jokes as Yotarou the stuffed bear.
* ExpressiveMask: Often, as Yotarou.
* FashionableAsymmetry: In the anime, though the design was first revealed on the cover of Book 4.
* {{Irony}}: Prior to her battle with the I-401 (and the ''Hakugei'' in the manga), she sneers at the idea of regret and humans expressing it. Guess what happens after her defeat at their hands...
* JerkAss: Before losing her ship.
* JerkWithAHeartOfGold: The HumiliationConga of getting sunk and getting reconstituted as a stuffed bear has mellowed her out. She's been ready to be the fall-guy when trying to explain things with Kongo and puts considerable stock in loyalty.
* LargeHam
* PintsizedPowerhouse: After being reconstructed with part of Haruna's nanomachines and gaining control of one of Makie's stuffed dolls. Even in this form she can still knock out soldiers with ease. [[spoiler:In the manga, the stuffed doll is actually a costume the now chibified Kirishima wears.]]
* {{Pride}}: A traits of hers and what led to her downfall. Haruna and Kirishima could have defeated both the I-401 and Hakugei had they call the rest of the 2nd Oriental Fleet for backup but refuses out of her desire to claim credit in defeating the I-401.

!!Maya
http://static.tvtropes.org/pmwiki/pub/images/mayaarpeggio_6211.jpg

Heavy Cruiser of the Fleet of Fog, currently (chapter.50) under Haruna's command, and calls her "The Flagship of My Heart".
----
* AnnoyingYoungerSibling: To Kongou. Fortunately, Kongou is TheStoic.
* BrokenRecord: She once spammed Kongou's comms channel by singing a song ''189567 times'' before being interrupted by Haruna. Even assuming the song was only a second long, that's still [[MadnessMantra ''fifty-two hours'' non-stop]]. She could of course just have been exaggerating.
* ButtMonkey: She gets easily hacked by the other Mental Models.
* DeathByAdaptation: In the ''Ars Nova'' anime. Her ship body is even absorbed into Kongou during the finale.
* ElegantGothicLolita
* GenkiGirl: Most of the time. [[spoiler:In Ars Nova, after the revelation that she's an AI construct designed to spy on Kongou, this attitude takes on a creepy undertone when she starts to repeat herself to Kongou.]]
* MadnessMantra: Her oft-quoted line "It's a carnival!" is used ''once'' in the manga. In ''Ars Nova'' she's stuck saying it in a loop after [[spoiler:her mind is wiped by the I-400 twins and left to guard/annoy Kongou.]]
* MoreDakka: It's clear that the Fog like this trope, but she likes to take it to a ''[[UpToEleven to a completely different level]]''.
-->It's a CARNIVAL! ''(shoots '''everything''')''
* PerkyFemaleMinion
* PluckyComicRelief
* SelfDuplication: Uses her mini models as an orchestra.

!!Hiei
Battleship of the Fleet of Fog, leader of the governing body "Student Council".

* TheDragon: To Kongou.
* OrderVersusChaos: She believes the Fleet should be orderly and not chaotic which is why she hates Hyuga.
* {{Roboteching}}: Hiei's "Sniper System" lets her bend the beam of her WaveMotionGun significantly off-axis. The system is apparently unique to her.
* StudentCouncilPresident: She and her own [[QuirkyMinibossSquad personal squadron]] wear matching Student council uniforms.
* TheRival: To Hyuuga. Hiei doesn't like the former 2nd Fleet Flagship because her eccentric behavior rubbed off on Takao, Haruna, Kirishima and Maya, her subordinates at the time, which lead them to have their own personalities and later defecting from the Fog.
* ZettaiRyouiki: A solid Type A.

!!Myoukou
Heavy Cruiser and Hiei's second-in-command of the "Student Council".

* {{BFG}}: Her Super-Gravity Cannon takes the form of a ''pair'' of colossal gun barrels longer than her own hull.
* ColdSniper
* EyepatchOfPower: Linked to her main cannons as a targeting display, it's otherwise decorative and removable.
* FashionableAsymmetry: Her knee-socks are of different lengths. She and Haguro both wear a single armoured bracer in the manner of Japanese archers [[note]] Myoukou's is on her left arm, Haguro's is on her right.[[/note]] The hemlines of all "Student Council" jackets (save Hiei herself) are longer on the left side.
* TheDragon: To Hiei.

!!Nachi
Sister ship of Myoukou, has top-notch sonar and communications gear and serves as the ears of Hiei's "Student Council".

* RecursiveAmmo: Nachi's signature attack is to launch one or more ICBM-sized missiles at the target, each of which is carrying between 12 and 16 torpedoes.
* RedOniBlueOni: The Blue to Ashigara's Red.
* TheQuietOne: Has a very muted personality compared with her sisters.
* TheSmartGuy: Is ''constantly'' asking Ashigara to slow down and ''study the data'' before charging into combat.

!!Haguro
Sister ship of Myoukou and member of Hiei's "Student Council". Initially an escort of Hiei and Myoukou, has since teamed up with Ashigara after they were both sunk by Iona.

* HumiliationConga: Forced to wear Hiei's "Student Council" uniform, was the first one sunk by Iona, reduced to only her (totally helpless) core and then ''swallowed by a shark''. Now that she's been rescued she's still stuck playing second fiddle to Ashigara.
* TokenMiniMoe: Is notably younger looking than the other members of Hiei's group, appearing only as a pre-teen instead of the more typical mid-late teens of the other members.

!!Ashigara
Sister ship of Myoukou and final member of Hiei's "Student Council". Initially paired with Nachi, has wound up with Haguro after they were both sunk by Iona.

* ActuallyPrettyFunny: After getting beaned in the face with a torpedo, Ashigara floats stunned to the surface before cracking up with laughter.
* BoisterousBruiser: She ''really'' likes to get straight into combat. The moment Iona was detected she dove headlong into the water, knowing full well that it meant she could only use torpedoes (which she's not very good with).
* ButtMonkey: Often self-inflicted, Ashigara's tendency for bull-rushing into a fight means that she doesn't get much respect ''and'' makes her defeats the most humiliating.
* HimeCut: With bonus OjouRinglets at the ends of her long side locks.
* RedOniBlueOni: The Red to Nachi's Blue.
* WorthyOpponent: ''Wants'' to be this for Iona, believing in the Fair Fight. [[spoiler:This is why she refuses to simply scuttle Iona from inside when she and Haguro end up in Iona's engine room.]]

!!Ise
Battleship of the Fleet of Fog, and Hyuuga's twin sister. Has taken over patrol duties from Kongou and Hiei since the hunt for Iona really took off.

* TheGhost: No longer as of Chapter 63. She certainly looks like Hyuuga, but dresses like Maya in [[ElegantGothicLolita ruffles and bows]]. Has a sweet tooth as well.
* Yandere: ''Potentially''. The way she said she'd "give [Hyuuga] even more love," did ''not'' seem like Hyuuga would like it.

!!I-400
http://static.tvtropes.org/pmwiki/pub/images/i400arpeggio_1134.jpg
->Voiced by: Creator/AoiYuuki

Fleet of Fog submarine, member of the Intelligence Fleet. Looks exactly like Iona, save for her costume.
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* DeathByAdaptation: Is sunk by Iona in the ''Ars Nova'' anime.
* {{Qipao}}: Wears one.
* TheStoic: What we seen about her so far.

!!I-402
http://static.tvtropes.org/pmwiki/pub/images/i402arpeggio_8918.jpg
->Voiced by: Creator/AoiYuuki

Fleet of Fog submarine, member of the Intelligence Fleet. Also looks exactly like Iona, save for her costume.

In the manga, she is the one that retrieves Takao in the wake of her battle against Zordan, and brings her to Yamato for a little heart-to-heart. Later on, she accompanies Takao and Zuikaku to Yokosuka, where she more or less settles into the role of Takao's nanny.
----

* DeathByAdaptation: See I-400's entry.
* HeelFaceDoorSlam: In the anime at least, she only start to show a tiny bit of emotion just before she got hit for shielding her sister.
* {{Troll}}: Enjoys teasing Takao over her crush on Gunzo.

!!Nagato
Flagship of the First Oriental Fleet
* FinishingEachOthersSentences: Her two mental models do this.
* SingleMindedTwins: She has a pair of mental models as her avatar, one a shrine maiden, the other a geisha. There's very little different between them other than clothing.
* TheChessmaster: Has shown a particular fondness for supporting Kongou's wayward subordinates, apparently [[ForTheLulz just to see what will happen next]].
* YamatoNadeshiko: There seems to be a pattern to these battleships...

!!Zuikaku

A Fog "assault ship" under Nagato, she joins I-402 in infiltrating Yokosuka, and in the process becomes Takao's virtual roommate in their hideout at the docks. Contrary to most Fleet of Fog Mental Models, Zuikaku shows none of the awkwardness in interacting with the local human population, and has become sort of a regular at the local market due to the seafood she catches.
----
* FriendInTheBlackMarket: Zuikaku herself is this to any restaurant owners looking for fish that can't be caught close to shore, like tuna. Just don't ask how she got them [[spoiler:rod and reel, usually]].
* KindHeartedCatLover: Is shown to have a cat as a pet, though fandom is divided at whether or not it's a real cat, or another mental model.
* NonIndicativeName: Zuikaku has been repeatedly called (in official materials no less!) as an "assault ship", but its obvious to all who can see that her ship body is an aircraft carrier.
[[/folder]]




!The Scarlet Fleet

A splinter faction of the Fog Fleet maintaining the European blockade, and commanded by Gunzou's father Shouzou, the Scarlet Fleet has notably deviated from the duties tasked to it by the Admirality Code, to the point where it's been drawn into conflict with the ''rest'' of the European Fleet (under the HMS Hood). With the Superbattleship Musashi as its flagship, the fleet seems to be tacitly supporting Shouzou's machinations toward an as-of-yet unknown goal.

[[folder:Members of the Scarlet Fleet]]

!!Shouzou Chihaya
Captain of the Musashi, Former Captain of the I-401 before he defected to the Fleet of Fog
* CoolShades
* FaceHeelTurn: Was a former war hero who captured the I-401. Now he's one of the Fleet of Fog commanders.
* SchrodingersCast: While very much alive and even a major antagonist in the manga, Shouzou's fate is left ambiguous in the ''Ars Nova'' anime.
** OnlyMostlyDead: Previews for the second Ars Nova movie show that Shouzou is very much alive, and much like his manga counterpart, in command of Musashi.

!!Musashi
Superbattleship of the Fleet of Fog, and sister ship of Yamato.
* EyesAlwaysShut
* PrettyInMink: Unlike her sister, she appears instead like a Russian Snow Girl.
** Averted in the Ars Nova Cadenza movie previews, where she's shown to be wearing a more revealing, and generally "hipper", outfit a teenaged-looking girl would be expected to wear.

!!U-2501
Fleet of Fog submarine European Fleet.
* CryCute: When Zordan orders her to cancel her mental model.
* DoesNotLikeShoes: Dances barefoot on her deck while she has the ability to do so.
* TokenMiniMoe: Her mental model takes the form of an adorable child, a marked contrast to her crew who are all in their mid-late teens.

!!Zordan Stark
Captain of U-2501.
* CombatPragmatist
* GermanicEfficiency: Does not like mental models because of their calculation usage. At one point, he even orders his own submarine to cancel her mental model because of it.
* EvilCounterpart: Zordan Stark serves as one to Gunzou Chihaya. Both are human captains of crewed Fog submarines, match each other in tactical skill and share close personal connections with their crews. What sets them apart is Zordan's ruthlessness and their completely opposed views on Mental Models: Chihaya considers Mental Models as people and even leaves Iona in charge of his crew when he's not there; Zordan considers Mental Models a waste of resources on a crewed ship and forbids U-2501 from manifesting one, which is a shame because the one time she did U-2501 was ''adorable''.
* SmugSnake
[[/folder]]

[[folder:Unaligned Fog Fleet Ships]]

!!Bismarck
The first Fog battleship sighted by humans. Last witness of the Admiralty Code, Flagship of the Fog's European Fleet.
* GirlishPigtails
* SingleMindedTwins

!!Repulse
A fog battlecruiser that apparently defected due to a disagreement with the European Blockade fleet under the command of Hood; while the latter advocated a more direct intervention against Shouzo's Scarlet Fleet, Repulse only wanted to continue with the Admiralty Code's initial order of blockading the sea lanes of Europe. When her fellow ship Prince of Wales decided to force the issue, Repulse escaped into Pacific waters instead with her escort Vampire in tow.
----
* BoobsOfSteel: As a battlecruiser she has serious offensive firepower and is possibly the most well-endowed of any Mental Model seen so far, but somewhat subverts the trope in having [[GlassCannon weaker armor than a true battleship]] and an even weaker [[ShrinkingViolet sense of confidence]].
* PrehensileHair: A variation: it's not her actual hair, but Repulse has a pair of long ribbons on her hat which function the same way.
* {{Meganekko}}
* {{Meido}}: Not only has the uniform, but quite literally sweeps up damage with nanomaterial brooms.
* LuminescentBlush: Easily flustered and embarrassed, especially whenever Vampire brings up the potential of working with humans.
* ScrewThisImOuttaHere: Had to abandon her patrol route after Prince of Wales decided she was disobeying orders.

!!Vampire
Repulse's escort destroyer, and one of the first Fog ships shown to have a personality ''before'' she was finally given a Mental Model (care of Repulse's annoyed replies). While she obviously doesn't have high opinions of her command ship's leadership capabilities, she's decided to stick with the hapless battlecruiser in her exile to the Pacific.
----
* {{Meido}}: Much like her command ship, Vampire's Mental Model is themed as a Victorian Maid, though she wears a much shorter skirt, as well as a bat-themed ribbon.
* ServileSnarker: Vampire takes every opportunity to belittle Repulse's competency, but it's obvious that she's loyal to cruiser all the same.


[[/folder]]

! Supporting Human Characters

[[folder: Japanese Government and Military Personnel]]
!!Mitsumine
Current Prime Minister of the Central District of the three districts that the Fog's blockade has carved Japan into. He's proven far more adept at politics than his former naval career.

* NumberOne: Was formerly Kita's XO when they took part in the Great Naval Battle.
* FriendlyEnemy: Views Kita as this; while they're bitter political opponents, he still has affection for his former captain.
* GeniusCripple: By all accounts is a masterful political figure, despite being confined to a wheelchair with a life-support system since he was nearly killed in the Great Naval Battle against the Fog.
* GoodIsNotSoft: See the Chains of Commanding, below.
* MachineMonotone: ''Possibly''. He's yet to be voiced by an actor, but his [[PaintingTheMedium speech bubbles]] are shaped like those used for radio communications, so his voice is certainly artificial.
* {{Realpolitik}}
* ReasonableAuthorityFigure
* TheChainsOfCommanding: Is really feeling it after becoming Prime Minister. Has expressed a few times how he hates himself for having to make hard-hearted choices but holds out hope they're for the best.

!!Ryoukan Kita
Diet member and likely the next Prime Minister of the Central District.

* TheCaptain: Was formerly a JMSDF destroyer skipper, and acquainted with Gunzou's father.
* FriendlyEnemy: Views Mitsumine as this; while they're bitter political opponents, he still has affection for his former XO. That said, he's not as nice about it as Mitsumine is.
* HonorBeforeReason: Inverted, Kita gives a couple of his old Army colleges a severe dressing-down over the Osakabe fiasco, which had been motivated by the Army's overwhelming desire to do ''something'' after being sat idle since before the Great Naval Battle. After the Iwo Jima disaster, Kita resigns from office in order to minimize the fallout from the affair rather than weaken the army's position further.
* NoMrBondIExpectYouToDine: Gunzou and his crew are treated to this in episode 3/Chapter 8. During dinner [[FunnyBackgroundEvent (of which only Iori actually eats anything)]] Kita tries to convince Gunzou to return Iona to the Japanese government so they can put a "proper crew" on board. The arrival of Haruna and Kirishima adds some urgency to the discussion, but [[CasualDangerDialogue not the (strained) civility)]].
* {{Realpolitik}}: Prime Minister Mitsumine and Asst. Secretary Kamikage are his primary opponents in the power struggle within the Japanese government [[spoiler:until Kita resigns to save face for the Army]].

!!Kamikage Ryujirou
Assistant Secretary to Military Command of Ministry of Defense (later promoted to full Secretary), Kamikage is the government official most sympathetic to Blue Steel. It was his idea to use I-401 to transport the Vibration Warhead data to the USA in the first place, which forms the major plot of the franchise.

* GoodIsNotNice: Is entirely willing to play hardball with political opponents or Japanese citizens if he believes it is in the best interests of the nation. He is [[MagnificentBastard ''considerably'']] more ruthless in the anime.
* Realpolitik: The power struggle between the various parties and regional capitals in the Japanese government is very real. Kamikage, despite his relatively young age, is a consummate player.
* ReasonableAuthorityFigure: Is the highest ranking official in the Japanese government to view Gunzou and Blue Steel as assets and not liabilities. Is starting to win the Prime Minister over to his way of thinking.
* TheChessmaster: Has a lot of assets to move around the board, these only grow after his promotion. All for Japan.
* TheStrategist: As part of his job in the Ministry of Defense.

!!Cruz Herder
One of the United States Marines stationed in Japan before the fog blockade now part of the Japanese Navy as a special forces detachment.
* BadassNormal: He's yet to engage in combat but interactions with other characters detail his professional reputation as one.
* DeadpanSnarker: His casual and often irreverent mannerisms contrast sharply with the much more uptight Kamikage, his primary contact and ally in the Ministry of Defense.
* OlderThanHeLooks: Given his training and the amount of time confined to Japan, Cruz is probably in his forties. Not that you'd know by looking at him.

!!Daisaku Komaki
Captain of the Hakugei 3, Japan's latest and greatest submarine.
* {{Adorkable}}: Badass ship captain, yes. Completely useless when it comes to women, oh yes. His bumbling attraction to Mauri makes him one of the most endearing of the human characters.
* BadassNormal: Becomes captain of the first man-made ship to sink a Fog warship. That it was Haruna and Kirishima ''at the same time'' just makes the victory all the sweeter. [[spoiler:Willing to intervene in the escape of ''Repulse'' and ''Vampire'' into the Pacific.]]
* HotbloodedSideburns: An understated, well-trimmed example, but they do go all the way to his jawline.

!!Maruri Hibiki
->Voiced by: Creator/KanaHanazawa

Former Sonar operator of I-401. Transfers to the ''Hakugei'' because of her experience in Blue Steel.

* AllLoveIsUnrequited: Is still holding a candle for Gunzou. His inability to notice her affection and the ''massive'' guilt he carries from losing Kotono is a big part of why she left Blue Steel and rejoined the Navy.
* LoveCannotOvercome: Even though she was the first crew member to join the Blue Steel because she was in love with Gunzou, she couldn't handle the risks of being in Blue Steel.

!!Makoto "Osakabe"
Prime Minister of the Northern District and a Design Child.
* CreepyChild
* DudeLooksLikeALady
* TeamSwitzerland: Is willing to support either the Japanese government or the Fleet of Fog as long as Hokkaido benefits from the alliance.
* TheLeader: Was genetically engineered to be a capable leader without humans flaws like corruption or greed.
* TheStoic: Neither is he capable of strong emotions, being engineered to be objective and dispassionate. His concern for Makie and by extension [[spoiler:Haruna, Kirishima and Maya]] is noted by himself as deeply uncharacteristic.
[[/folder]]

[[folder:Other]]

!!Makie Osakabe
http://static.tvtropes.org/pmwiki/pub/images/makiearpeggio_5312.jpg

A young girl with some mysterious origins. Her role becomes much bigger after she runs into Haruna and Kirishima.
----

* ArtificialHuman
* ChildProdigy: Helped design the torpedo that has the Fog running scared.
* LittleMissBadass
* MoralityPet: Turned Haruna from a war machine into one of the best developed characters of the manga.
* MysteriousWaif: She isn't allowed to travel very far from the mansion she lives in. As a result, she hasn't had much contact with too many people.

!!Lawrence Valentine/Toujuurou Osakabe
http://static.tvtropes.org/pmwiki/pub/images/toujuurouarpeggio_4731.jpg

Makie's overprotective butler. Unknown to Makie, Lawrence is actually [[spoiler:Toujuurou Osakabe, her "grandfather" and creator.]]

In Ars Nova, he is Makie's adopted father and a prominent weapons researcher. [[spoiler:His attempts to defeat the Fog inevitably turns up in failure, largely due to the limitations of humans. He ends up creating Makie in the lab, and with her help, manages to design a torpedo that's capable of defeating Fog ships.]]
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* TheAtoner
* BattleButler: Although Makie just knows him as Lawrence, secretly he is...
*** [[spoiler:TheProfessor: Involved in the creation of Makie and the other Design Children and her unseen 'grandfather'.]]
* DiseaseBleach: [[spoiler:His hair turned white as he watched most of the design children die in front of him.]]
* [[spoiler:FakingTheDead: In Ars Nova, he faked his death in an attempt to keep the government from doing things to Makie. While Makie believed he really died, Haruna and Kirishima finds out he was still alive, but bedridden. He does [[KilledOffForReal eventually die]] shortly after meeting the two Fog ship girls however, but not before asking them to watch over Makie, after noticing how attached the girl was to them.]]
* HeroicSacrifice: Stopped the Army from assassinating Makie, but it... [[HeroicSacrifice uh... yeah]].
* [[spoiler:OmnidisciplinaryScientist: In Ars Nova where he was a weapons researcher and geneticist. Unlike in the manga where he was only a geneticist.]]

!!Saori Chihaya
Mother of Gunzou Chihaya. She is currently under house arrest, ostensibly for her own protection.

* DeathByAdaptation: Hinted to have committed suicide in the ''Ars Nova'' anime.
* GildedCage: She's under house arrest in a mansion that's heavily monitored by security cameras. The place is lovely with a huge greenhouse/aviary in the back where she can still do her research on birds and has a domestic staff to handle all the chores, but she's still banned from leaving the property.
* ShipperOnDeck: Ships Takao with her son.

!!Kotono Amaha

The childhood friend of both Gunzo and Sou, she was the valedictorian of their class at the Maritime Institute. She died when the test facilities of the institute caught fire, but her remains have never been found. It was her death that fueled Gunzou's dissatisfaction with the current state of the world, which eventually made him join up Iona.

[[spoiler:There are increasing signs that she might have been one of Yamato's mental models to begin with, sent to live among humanity to satisfy whatever curiosity the supreme battleship had for humans in general.]]
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* TheAce: Her reputation among Gunzo's schoolmates. Sou even calls her "the wall that Gunzou could not overcome".
* ChildhoodFriend: To Gunzou and Sou.
* CynicismCatalyst: Her death was the prime motivator for Gunzo to change the status quo of the world, and ally with Iona.
* PosthumousCharacter: Died in an accident two years prior to the start of the story, however...
** NeverFoundTheBody: ... they never found her body after the fire that killed her.


[[/folder]]
----