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' anime versions may differ from their manga counterparts.

[[foldercontrol]]

[[folder:Blue Steel]]

!!Gunzou Chihaya
http://static.tvtropes.org/pmwiki/pub/images/gunzouarpeggio_5709.jpg
->Voiced by: Creator/JunFukuyama (Drama CD), 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 tie after becoming the captain of the Blue Steel.
* TheCaptain
* ChickMagnet: Both human girls and Fog ships seem to be attracted to him, though perhaps 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 who gave humans a CurbStompBattle countless times before, it's not surprising he's forced to think outside the box a little bit with I-401.
* DesperatelyLookingForAPurposeInLife: The revelation that his father was a traitor and witnessing his childhood friend Amaha Kotono died in a fire causes him to become this until he meet 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 he and his crew first mission on the I-401 disappear after the submarine returned to Japan 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.
* TheParagonAlwaysRebels: While not exactly top of the class, he qualifies for this in the merit of being in the top three and is quite a decent captain even amongst professional soldiers. End result? Deserted the military, taking a few of their most talented personnel, and works as a mercenary.
* TheStrategist: He comes up with some rather unique tactics during combat to win against his opponents.
* RedBaron: Called the "Battleship Killer" and "Route Holder" in chapter one.

!!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 a while back. 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.
----
* 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. And even her mental model is capable of this, such as when she rescues Haruna, Kirishima, and Makie from soldiers. [[spoiler:She also dodges several of Kongou's torpedoes in episode 12 of Ars Nova, and at one point even runs across one.]]
* CoolBoat
* EmotionlessGirl: Played up in the anime. She's far more expressive in the manga, and has a more pronounced sense of humour.
* LittleMissSnarker
* 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.
* ReiAyanamiExpy: A slight, blue-haired EmotionlessGirl in command of phenomenal power who's trying to BecomeARealBoy? Yep. Again, this is emphasised much more in the anime.
* 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.
* SpaceshipGirl
* TalkingToHerself: With her other triplet sisters in the drama CD. In the anime each of the 400-series subs has their own voice actress.

!!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
* TheBlank
* TheFaceless: Always has his helmet on. He claims it's easier to contain his allergies this way.
* TheGraphShowsTheTrend: He loves them.

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

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

* 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.''
* {{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.
* 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
* MysteriousPast: [[spoiler: Apart that she was Maruri Hibiki replacement, her past is still a mystery.]]
* TheQuietOne

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

[[spoiler:Former Fog battleship and flagship of the Second Oriental Fleet turned port operator]]
----

* CatSmile
* ExcuseMeWhileIMultitask: Her schtick. Apparently, she can [[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.
* GenkiGirl: Acts this way towards Iona frequently.
* TheGlomp: She loves doing this to Iona.
* HighClassGlass
* LoveAtFirstPunch: With 12 corrosive torpedoes.
* PowerFist: Chapter 34 of the manga gives her a '''huge''' one which is bigger than her head.
* RocketPunch
* StalkerWithACrush: To Iona.
* ShipperOnDeck: To Gunzou and [[spoiler: Takao]] [[JustForPun ship]]. Mostly because she wants Gunzou away from Iona so she get have her herself.

[[/folder]]

[[folder:Japanese Government and Military]]

!!Mitsumine
Current Prime Minister of the Central District of the three districts that the Fog's blockade has carved Japan into.

* NumberOne: Was formerly Kita's XO when he was in the JMSDF.
* FriendlyEnemy: Views Kita as this; while they're bitter political opponents, he still has affection for his former captain.
* ReasonableAuthorityFigure

!!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.

!!Kamikage Ryujirou

!!Cruz Herder
One of the United States Navy [=SEALs=] stationed in Japan before the fog blockade now part of the Unified Army.

!!Daisaku Komaki
Captain of Hakugei 3
* BadassNormal: with help from I-401 becomes the captain of the first man made ship to sink two Fog battleship

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

Former Sonar operator of I-401. Transfers to the ''Hakugei.'

* LoveCannotOvercome: Even though she was the first crew member to join the Blue Steel because she was in love with Gunzou, his many attempts that almost got him killed was just too much as she couldn't bare seeing him die.

!!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.
[[/folder]]

[[folder:The Fleet of Fog (Japan)]]

!!Yamato
Supreme Flagship of the Fleet of Fog. Looks exactly like Amaha Kotono.
* TheOjou
* SingleMindedTwins: Averted, One of them is shown to be Kotono with complete memories of being together with Gunzou, the other is more like the other Fog ships.
* PerpetualSmiler
* WorthyOpponent: Respects humanity due to their strategic skills and will to keep fighting the Fleet of Fog despite the odds.
* YamatoNadeshiko: With a name like that what did you expect?

!!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 (before reorganization Third Oriental Fleet)
----

* EmotionlessGirl: Is this, and believes that all Fog ships should be this.
--> "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]]
* 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
* ShesGotLegs
* [[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.]]

!!Nagato
Flagship of the First Oriental Fleet
* FinishingEachOthersSentences: Her two mental models do this.
* SingleMindedTwins: She seems to have a pair of mental models as her avatar.
* YamatoNadeshiko: There seems to be a pattern to these battleships...

!!Musashi
Superbattleship of the Fleet of Fog (sister ship of Yamato)
* EyesAlwaysShut
* PrettyInMink: Unlike her sister, she appears instead like a Russian Snow Girl.

!!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. [[spoiler: Not really. Supplemental material in the manga reveals that the coat actually boosts her processing power by 100%. Losing it drastically reduces her capabilities.]]
* 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.
* 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.
* LargeHam
-->''(after putting on her cape and striking a pose)'' "Ka-CHING!"
* [[OneManArmy One Moeblob Army]]: She goes 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. Then not even the coat can hide her emotion when Doctor Okabe died.
* TookALevelInBadAss: After losing her ship body.

!!Kirishima
http://static.tvtropes.org/pmwiki/pub/images/kirishimaarpeggio_7611.jpg
Battleship of the Fleet of Fog.
----

* BadassLongcoat: In the manga.
* 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.
* LargeHam
* PintsizedPowerhouse: After being reconstructed with part of Haruna's nanomachines and gaining control of one of Makie's stuffed dolls.[[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.

!!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.
* StudentCouncilPresident: She and her own personal fleet wear Student council uniforms.
* TheRival: To Hyuga. Hiei doesn't like the former 2nd Fleet Flagship because her eccentric behavior rub 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.

!!Ise
Battleship of the Fleet of Fog.
* TheGhost

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

Heavy Cruiser of the Fleet of Fog.
----

* CanNotSpitItOut: Attempted to make a love confession to Gunzou... and failed miserably.
* HeelFaceTurn: Runs away from the Fog and joins Blue Steel.
* [[spoiler: HeroicSacrifice: Anime-only: 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. However, her core survived, and she is still able to at least turn up in screens onboard the ship.]]
* InSeriesNickname: Tsundere Heavy Cruiser. At least two characters have independently started calling her that.
* InstantCosplaySurprise: When she's on the Yamato she's subjected to several changes in a row.
* 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.
* 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.]]
* {{Tsundere}}: She's a Type B, 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.

!!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.
* ButtMonkey: She gets easily hacked by the other Mental Models.
* 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.]]
* MoreDakka: It's clear that the Fog like to prefer this, but she likes to take this to a ''[[UpToEleven to a completely different level]]''.
-->It's a CARNIVAL! ''(shoots '''everything''')''
* PerkyFemaleMinion
* PluckyComicRelief
* SelfDuplication: Uses her mini models as an orchestra.

!!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.
----

* {{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.
----

* {{Troll}}: Enjoys teasing Takao over her crush on Gunzo.

[[/folder]]

[[folder:The Scarlet Fleet]]
!!Bismark
The first Fog battleship sighted by humans.
* GirlishPigtails
* SingleMindedTwins

!!U-2501
Fleet of Fog submarine European Fleet.
* CryCute: When Zordan orders her to cancel her mental model.

!!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.

!!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.
* SmugSnake
[[/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.]]

----

* 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 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.]]
* [[spoiler:OmnidisciplinaryScientist: In Ars Nova where he was a weapons researcher and geneticist. Unlike in the manga where he was only a geneticist.]]

!!Saori
Mother of Gunzou Chihaya. She is currently under house arrest.

* GildedCage: She's place under house arrest at mansion that's heavily monitored by security cameras.
* ShipperOnDeck: Ships Takao with her son.
[[/folder]]