%% ZeroContextExample entries are not allowed on wiki pages. All such entries have been commented out. Add context to the entries before uncommenting them.
Characters of ''Anime/{{Free}}''. Names are in western order.

'''Spoilers for the events of Season 1 are unmarked. Some major spoilers for ''Eternal Summer'' may appear in trope names. Proceed with caution.'''


[[folder: Main characters in general]]
* {{Adorkable}}:
** Makoto and Nitori are this at all times.
** The trailers made Rei look like a sort of [[StoicSpectacles reserved megane]] archetype. Not so. While he's often book smart and serious, he still [[TheComicallySerious does ridiculous things as if they were normal]]. This includes trying on silly patterned swimsuits with gusto, going on [[LargeHam hilariously passionate rants]] about only performing ''beautiful'' sports, belly-flopping into a pool, occasionally pole vaulting like [[https://s-media-cache-ak0.pinimg.com/736x/59/4b/72/594b72dfaeefe8fdecbfc3e011c1d790.jpg this]], calling Rin "Rin-chan-san" [[note]]since Nagisa calls him "Rin-chan"[[/note]], and [[spoiler: pretending to be a detective and making sound effects while spying on Rin]]. He perhaps outclasses everyone else in this aspect.
** Strict captain tendencies aside, Seijuurou is actually a friendly, dorky guy, especially around Gou. The same can be said for his brother Momotarou, who was an instant favorite before he even made an appearance in the anime.
** Even Haruka and Rin have their moments. For Rin, this was especially evident during his initial stay in Australia.
* AmbiguouslyGay: Almost every single major male character save the Mikoshiba brothers shows zero interest in women and have very, uh, intense friendships, to put it lightly. The "ambiguous" label is perhaps most questionable in the cases of Makoto and Rei.
* AnimalMotifs: Each swimmer is associated with a different swimming-style-related animal.
** Haruka -- Dolphin
** Makoto -- Orca
** Nagisa -- Penguin
** Rin -- Shark
** Rei -- Butterfly
** Sousuke -- Whale shark
** Momotarou -- Sea otter
** Nitori -- Duck
* {{Bishonen}}: They're all slim, tall (bar Nagisa and Nitori), and handsome, and could be more accurately described as "pretty" than "manly" (except for Seijuurou and Sousuke), which is par for the course for most swimmers.
* ChildhoodFriends: All of them, excluding Rei, used to be elementary school friends until they went their separate ways (though Haruka and Makoto still went to school together).
* ColorCodedCharacters
** Haruka = Blue[[note]]Purple on promotional poster, early concept designs, and swimming trunk stripes[[/note]]
** Makoto = Green
** Nagisa = Yellow[[note]]Pink on swimming trunk stripes[[/note]]
** Rin = Red
** Rei = Purple[[note]]Blue on promotional poster and swimming trunk stripes[[/note]]
** Sousuke = Teal
** Momotaro = Orange
** Nitori = Lavender
** Kisumi = Pink
* FemaleGaze: One of the main themes of the anime is 'upper bodies'.
* FiveManBand:
** TheHero: Haru
** TheLancer: Rin (TheRival)
** TheBigGuy: Makoto (although he's not the most prodigious swimmer and he's easily frightened, he's the tallest and the TeamMom)
** TheSmartGuy: Rei (very intelligent and prone to invoking AwesomenessByAnalysis)
** TheChick: Nagisa ({{Keet}}). Gou also fulfills this role in the swim club, being their manager.
* GenderBlenderName: All of the members of the Iwatobi Swim Club have gender neutral names that are popular for girls. Incidentally, their female manager Gou inverts this by having a name usually given to boys. Rin, Aiichirou and Momotarou join in the ThemeNaming as well; while Aiichirou and Momotarou's names are male names, their nicknames "Ai" and "Momo" are used as names for girls.
* MrFanservice: Being swimmers, this is of course expected.

!!Iwatobi Swim Club
[[folder:Haruka Nanase]]
->'''Voiced by:''' Creator/NobunagaShimazaki, Creator/MegumiMatsumoto (young) (Japanese), Creator/ToddHaberkorn, Lara Woodhull (young) (English)

The strong, quiet protagonist of the series. A second-year student with a strong fixation to water. Was childhood friends with Makoto, Nagisa, and Rin. Has a natural talent for swimming, but does not swim forms other than freestyle.
* AffectionateNickname: Is called "Haru" by Makoto and Rin and "Haru-chan" by Nagisa, when they were kids, Rin and Nagisa referred to him as "Nanase-kun" before they became close enough to him to call him "Haru/Haru-chan".
* AmbiguousDisorder: His obsession with swimming and water would be rather unsettling were it not clearly meant for comedy and constant shirtless scenes. He will even strip down to his swimsuit in public in order to step into a ''fish tank.'' The second season plays this a bit more seriously, since he shows signs of having an anxiety disorder due to feeling pressured to figure out what to do after graduation and being afraid of change in general.
* AnimalMotifs: Dolphins. He even has a dolphin as a bath toy and Nagisa compares him to one.
* BizarreTasteInFood: Others don't share his interest in mackerel pineapple pizza.
* BreakTheCutie: In ''Starting Days'', all the boys go through this, but Haruka probably deserves special mention, as he cannot cope well with change at all. First [[TheRival Rin]] leaves for Australia, right after the medley relay that had changed his view of swimming, making him feel that Rin didn't care about their friendship/rivalry. He and Makoto are placed in different classes, and Makoto starts growing distant from him and won't explain [[{{Gayngst}} why]]. The other two members of the medley team are uncooperative, and nothing like the previous medley teammates he had. [[spoiler:He starts to eat only his favorite food and nothing else, hinting at being depressed, and his stamina during the tournament drops as a result, which earns Sousuke's ire. Things only improve after he and Makoto talk it out.]]
* BrilliantButLazy: He may spend his time slacking around, but he is a profoundly gifted swimmer, an excellent artist, and a talented cook.
* BrutalHonesty: Unafraid to contradict or correct other characters.
* CatchPhrase: "I swim free or I don't swim at all."
* CharacterDevelopment: Haruka begins the series depressed and closed-off, essentially relying on Makoto to to make sure he actually goes to school and to communicate on his behalf, but gradually he starts to involve himself in things more and more without having to be coaxed, such as personally helping Rei learn to swim (when at first he was ready to reject Rei over his dislike of water), and since opening up to his team in episode 9, Haru's been much more openly emotional, smiling often and being direct in showing concern or appreciation for his friends. Season 2 Haru compared to season 1 Haru is a perfect example of character development.
* [[ClingyJealousGirl Clingy Jealous Guy]]: Much as he tries to downplay it, he's obviously not happy about seeing other guys hang off of Makoto.
* CloudCuckooLander: He likes to swim so much that he spends most of his free time in the bathtub when it's too cold to swim outside. He also has a strange fixation on the school's mascot, Iwatobi-chan.
* ComfortFood: In ''Starting Days'', [[spoiler:at his lowest point, he only eats mackerel and rice for a few days, refusing to eat the food Makoto brings him. He winds up fainting and needing to be hospitalized.]]
%%* TheComicallySerious: Very much so. (needs more context)
* CrazyPrepared: He apparently wears his jammers at all times instead of underwear, so he can swim at the drop of a hat (read: If he is not stopped, [[CloudCuckooLander he]] ''[[CloudCuckooLander will]]'' [[CloudCuckooLander strip down to his jammers no matter]] ''[[CloudCuckooLander where]]'' [[CloudCuckooLander he is or]] ''[[CloudCuckooLander who]]'' [[CloudCuckooLander is watching]]).
* DesperatelyLookingForAPurposeInLife: His entire character arc during ''Eternal Summer''. [[spoiler:While everyone seems to be moving forward with their lives, it seems that Haru is only wishing for time to stand still so he never has to step out of High School. Not because he wants to [[GrowingUpSucks stay a teenager forever]], but because he wants to have his friends around always and keep on swimming the way he wants to, being free from outside pressure. As he realizes that his friends are all following their own dreams while he obviously has none, as it appears each time more inevitable that they will soon have to part ways, he completely closes off and lashes out whenever asked about his plans for the future.]]
* FourTemperamentEnsemble: The melancholic of the group of five.
* GenderBlenderName: Haruka is a feminine name, and as such he is often mistaken for a girl, so he's usually addressed as "Haru".
* TheGift: Haruka has not only passion, but also natural talent in swimming.
* HairFlip: Complete with a good helping of [[BishieSparkle sparkles.]]
* HeroicBSOD: He has one at the end of Episode 7, after Rin defeats him in their qualifying relay and claims he will never swim with Haru again. He gets better after his team gives him a comforting pep-talk message on his phone. And Makoto [[HomoeroticSubtext asleep on the floor waiting for him]] helped as well.
* HiddenDepths: He is a surprisingly good artist; the art club try to steal him away after witnessing his rather impressive poster advertising the swimming club. His detailed sketch of Iwatobi-chan isn't half-bad either.
** Not to mention [[BelligerentSexualTension whatever's going on]] [[FoeRomanceSubtext between him and Rin.]]
* IcyBlueEyes: Fits with his character color. Also goes to show his 'cool' personality.
* IJustWantToBeNormal: Says he can't wait to be ordinary in the first scene of him as a teenager. However, when Rin shows up, he thinks being ordinary can wait a while.
* InnocentFanserviceGuy: He's not stripping to show off, he just ''really'' needs to be in the pool ''this instant''.
* InSeriesNickname: "Haru", which he is often addressed as to get past his [[GenderBlenderName feminine-sounding name]].
* KindheartedCatLover: Though not as openly kind, Haruka has been seen playing with the neighborhood's cat and feeding strays with extra mackerel.
* MinorLivingAlone: Haruka lives alone in his late grandmother's house, although Makoto does live right down the street. Haruka's parents [[ParentalAbandonment moved away for work]], and his grandmother died sometime later. By ''Take Your Marks'', he has become a university student and now lives alone as an adult.
* NonNudeBathing: He has a habit of sitting in the bathtub with his swimsuit on when it isn't warm enough to swim outside.
* NoSocialSkills: Haruka is nice enough on the inside, but doesn't converse much and usually needs Makoto to speak his mind for him. That and his intense obsession with water sets him apart from others. As the series goes on, he becomes less socially awkward.
* NotSoAboveItAll: Stoic demeanor aside, he blushes and his eyes widen whenever Makoto mentions a cool new pool he can try out. Makoto nearly drowning in Episode 5 shows us another side of him, too.
* NotSoStoic: Though mild at first he shows signs of being worried over Makoto's fear of the ocean in Episode 5. During the near-drowning incident we see him losing his cool and actually shaking with fear while Makoto is still unconscious. Thankfully, he manages to work through it. It becomes even more noticeable at the end of Episode 7. He looks so genuinely hurt when Rin says he won't ever swim with him again, causing Haru to become troubled over his own motivations to swim. But by the end of it, Haru does get better thanks to Nagisa, Rei and Gou sending him a worried voicemail and finding Makoto waiting for him to come home. The latter half of Episode 9 shows Haru with far more emotion when he admitted he felt happy to swim with the others. It gets to the point where calling him "stoic" is debatable.
** By the last episode he's gone from [[http://www.anime-planet.com/images/characters/haruka_nanase_free_i_51625.jpg this]] to [[http://25.media.tumblr.com/637c9a2681500575ee3bd8a0b5994ec7/tumblr_mtp4a8SfOp1s17w80o1_500.gif this.]]
** Episode 9 of Eternal Summer [[spoiler:shows Haru actually angry enough to punch a locker and yell at Rin.]]
* ParentalAbandonment: A relatively mild case, but he's alone in his house because his father left for business and his mother decided to go with him. His mother makes an appearance in ''Starting Days'', so his parents probably left after middle school.
* PerpetualFrowner: He rarely smiles.
* TheQuietOne: The least talkative of the group, his words are usually brief. He talks more in later episodes, when he has opened up more.
* RealMenWearPink: He knows how to cook and in the 2015 "Top 20 Characters Otaku Want to Marry" he wound up placing 18th in the "Ideal ''Wife''" category.
* RedOniBlueOni: The blue to [[TheRival Rin's]] red.
* SecondYearProtagonist: When we first meet him, he's already in his second year in Iwatobi. He becomes a third-year in the second season.
* SecurityBlanket: In High Speed!, Haruka admits to himself that water comforts him when he is upset or when there is a distressing situation he can't do anything about (for instance, Rin moving to Australia when Haru was just warming up to him).
* ShamelessFanserviceGuy: All he wants to do is swim, but at each opportunity, his clothes just so happen to be in the way and he doesn't care where he is when he takes them off.
* ShowerOfAngst: He takes one after losing to Rin at prefecturals. You know it's bad when Haru is surrounded by water and still miserable.
* TheStoic: He comes across like this at first, but then episode 5 came along...
* SugarAndIcePersonality: He's very quiet and distant, but deep down he's a big old ball of sensitive fluff.
* SupremeChef: Haru is an excellent cook, and always has been, according to Nagisa. One of the audio dramas follows Haru teaching Makoto how to make mackerel braised in miso sauce; all the while, Makoto continually remarks on Haru's cool competence and air of professionalism as he works. The finished dish (which Haru turns into mackerel fried rice, in the end, as Makoto is a [[LethalChef dedicated but somewhat hapless culinary student]]) is apparently delicious, judging by Makoto's rave review of it.
** TeamChef
* TallDarkAndSnarky: More of case of being blunt than snarky, but still there.
* TechnicianVersusPerformer: Performer to Rei (and to a lesser extent Rin)'s Technician; he doesn't care about entry angles or initial velocity or even improving his time, he just wants to swim. And he's good at it.
* TrademarkFavoriteFood: Mackerel. So much that if Haruka was stuck in a deserted island, and he could only bring one thing, it'd be canned mackerel.
** On one of the drama [=CD=]s, the boys discuss [[HomoeroticSubtext which one of them they'd each go out with if they were girls]]. Haruka initially says he'd pick Makoto because it's "easiest"... but when Nagisa says he'd cook mackerel for Haruka every morning, he changes his mind.
* WhenHeSmiles: In Episode 9.
** In one of the "[=FrFr!=]" short movies included on the DVD releases of the series, Rei notes that he has never heard Haru laugh out loud; only Makoto recalls ever hearing Haru laugh, back when they were children. This revelation prompts Rei, Rin, Makoto, and Nagisa to tackle Haru and begin tickling him relentlessly in a [[MustMakeHerLaugh Must Make Him Laugh]] ploy. Haru struggles against their efforts, but eventually bursts out laughing -- cue the other swimmers' stunned, blushing expressions, as it turns out that Haru's laugh is ''heartrendingly'' sweet and adorable.

[[folder:Makoto Tachibana]]
->'''Voiced by:''' Creator/TatsuhisaSuzuki, Creator/SatsukiYukino (young) (Japanese), Creator/JohnnyYongBosch (English)

Haruka's best friend. Caring, considerate, but easily frightened. Elementary school buddies with Haruka, Nagisa, and Rin. His medley style is the backstroke.
* AffectionateNickname: Is called "Mako-chan" by Nagisa.
* AnimalMotifs: Orcas. It becomes more meaningful in Episode 6 when his feelings about swimming reflect the nature of orcas [[TrueCompanions conquering the largest distances as a pod]].
* BeYourself: In ''Starting Days'', Makoto feels that he should change now that he's in middle school, but eventually ends up trying too hard. He ultimately learns to be okay with who he is.
* BewareTheNiceOnes: When rumor has it that Rei is quitting the swim team, Makoto looks... quite unnerving. Too bad he's not good at keeping an intimidating front.
* BromanticFoil: Makoto, as the stoic Haruka's understanding best friend, apparently has to speak for him when Haruka refuses or acts too distant for anyone else to figure out his intentions.
* CharacterTics: He often complements his trademark smile by way of shutting his eyes and tipping his head forward or to the side. He seems to have [[SharedFamilyQuirks picked the habit up from his mother.]]
* CloudcuckoolandersMinder: He's generally the one to try and stop Haruka from stripping. [[EstablishingCharacterMoment Established]] in one of the first scenes, in which he shows up at Haruka's house to see why he's not going to school.
** He also knows how to get Haruka to cooperate with their plans when the latter is being stubborn (generally by mentioning an opportunity to swim).
* DarkAndTroubledPast: He developed a fear of the ocean as a child, as a result of an old fisherman Makoto befriended and his crew drowning during a typhoon. Just some time before, the fisherman gave him the pet goldfishes he wanted to catch from a summer festival, but eventually died even with all the proper care Makoto did to ensure they lived long. However, he copes with that fear because he wanted to swim together with Haruka and the others.
* FaceYourFears: He's willing to hide his fear for the sake of the team. When Rei needs saving in the ocean, Makoto hurries out to save him. He goes under and needs to be rescued himself, but he grows more confident with the support of his friends.
* FourTemperamentEnsemble: The phlegmatic of the group of five.
* FriendToAllChildren: He's very good with kids. His younger twin siblings Ran and Ren adore him, and he does a great job as a temporary swimming coach to a group of kids in episode 8 of ''Eternal Summer'', even helping one of them conquer his fear of swimming.
* GentleGiant: Easily the biggest and tallest of the main cast, but definitely gentle.
* GreaterNeedThanMine: Despite his own insecurities, he still focuses on other's problems before his own, a habit that annoys Haru.
* HeroicBSOD: In ''Starting Days'', he suffers one when Nao asks him if he really likes swimming, [[spoiler:and not just because of Haruka]].
* KindheartedCatLover: In Makoto's first scene, he greets and pets a kitten. He's later on seen playing with it.
* LethalChef: The poor guy can't cook ''at all''; the lunches he brings to school each day come courtesy of his mother. In one of the audio dramas, he asks Haru to teach him to cook something so that he can feed the twins while his parents are out celebrating their wedding anniversary. The lesson doesn't exactly go smoothly, and Makoto's rather unappetizing first foray into cuisine (a very salty variation on mackerel braised in miso sauce) only proves salvageable after all on account of Haru's own SupremeChef skills and quick thinking.
* LovableCoward: Makoto [[http://img11.imageshack.us/img11/1457/makoscared.png for sure]]. It's not difficult to scare him, as Nagisa knows, but he's easily the most caring member of the cast.
* LoveConfession: In ''Starting Days'', he apologizes and admits he likes both swimming and [[spoiler:Haruka]], though the romantic subtext varies between the viewers.
* NiceGuy: Easily the kindest and gentlest of the main cast and the person who holds his swimming team together.
* NotAMorningPerson: His younger siblings have to come wake him up in the mornings due to his tendency to oversleep.
* OneHeadTaller: He's the tallest member of Iwatobi's swim tea, and he's a head taller than Haru and Nagisa.
* OnlySaneMan: It's easy to see him as this when you see what kinds of shenanigans his friends go on.
* OOCIsSeriousBusiness: You know things are off when Makoto doesn't offer to lift Haruka out of the pool.
** NotSoAboveItAll: Makoto manages to maintain an air of maturity and steadfastness most of the time, but underneath his peaceful, nurturing surface, he's an outgoing, goofy nerd at heart. When he begins to enthuse over "Super Fusion Doppelganger" (most likely a SuperSentaiStance their elementary school swim club did together, by the sound of it) and launches into a demonstration thereof in the first episode, even ''Nagisa'' moans that he's being embarrassing.
* PerpetualSmiler: His default expression is a good-natured smile, befitting his sweet and friendly personality.
* SenpaiKouhai: Senpai to Rei's kouhai.
* [[ToplessnessFromTheBack Sexy Back]]: This trope is all over the series to begin with, what with everyone being swimmers and [[WalkingShirtlessScene walking shirtless scenes]], but Makoto deserves special mention because [[http://24.media.tumblr.com/0a7c729de92a8284e9c5bdc06247fa75/tumblr_ms9d1a0iov1rqt0r3o1_400.gif wow]].
* SleepCute: Well, more like "Wake Up Cute". He probably gives his younger siblings, the twins Ren and Ran, a run for their money with [[http://s935.photobucket.com/user/Downsider51/media/Bildschirmfoto2013-08-28um234218_zpscb690f22.png.html this]].
* StepfordSmiler: In ''Starting Days'', Makoto starts doing this to hide his anxiety [[spoiler:over his conflicting feelings between being independent from Haruka]]. Unfortunately, Haruka can see right through it.
* SweetTooth: He seems to have a pronounced weakness for chocolate.
* TaremeEyes: A little subtle, but still there.
* TeamMom: A gender flipped example. He's much more nurturing and always looking after the emotional welfare of his teammates. Arguably, Gou plays more of the Team Dad role than he does.

[[folder:Nagisa Hazuki]]
->'''Voiced by:''' Creator/TsubasaYonaga, Creator/SatomiSato (young) (Japanese). Creator/GregAyres (English)

A cheerful, direct first-year student. Childhood friend of Haruka, Makoto, and Rin. His medley style is the breaststroke.
* AgentPeacock: [[http://i.imgur.com/jEwOLT2.jpg Look at his jammers!]]
** He's dressed incredibly flamboyantly (more so than the rest) in the ED, in colorful gauze and bangles.
* AnimalMotifs: Penguins. They're even on his ''underwear!''
* BigEater: Watch as he makes almost half a pizza disappear in less than a minute!
* BookDumb: Somewhat. He is pretty smart and he has no trouble studying - everyone is very surprised at how badly his grades have dropped - it's just that studying AT ALL evokes bad memories of his middle school years. Thus he avoids it as much as possible and his grades plummet.
* CheerfulChild: A male version of this [[http://25.media.tumblr.com/b658b7e305b56c206ad01848360bbacb/tumblr_mpe6y5rpMR1rorbzqo1_500.gif when he was young]]. Turns out he wasn't always so cheerful; he said himself in the drama CD that he used to be a crybaby and was bullied often due to his GenderBlenderName. If that wasn't bad enough, his sisters forced him into dressing up in girls' clothes and he was often teased to the point of tears. He became cheerful after meeting Haruka.
* CloudCuckooLander: For example, one of the main reasons he tries to recruit Rei is because he, too, has a GenderBlenderName.
* CuddleBug: The most physically affectionate of the cast, he tends to suddenly snuggle up to others. Especially Haruka or Rei.
* TheCutie: His mannerisms is seen as this.
* DraggedIntoDrag: He has three older sisters and when he was younger, they'd often dress him up in girl clothes and have him wear makeup, even packing one of their swimsuits into his swim bag. It's entirely possible that they still do dress him up since they put another one of their swimsuits in his swim bag when he was in ''high school''.
* DudeLooksLikeALady: Somewhat, his [[{{Keet}} keetness]] makes him as bubbly as a girl, he's very short in stature for a boy his age, he has a bit more of a feminine face than the others, mainly due to his eyes, and was even dressed up as a girl by his older sisters when he was younger. His GenderBlenderName doesn't help much either.
* DumbBlonde: Appears to be this based on personality, but demonstrates a more cunning side.
* [[EducationMama Education Mama and Papa]]: His parents are very demanding when it comes to academic success, [[spoiler:often at the expense of Nagisa's happiness. They enrolled him in a very strict middle school where he did nothing but study, and they only allowed him to transfer to Iwatobi with his friends when they noticed how unmotivated and miserable Nagisa was feeling. When his grades in Iwatobi drop, they tell him to quit the swimming club and focus on his studies.]]
* FourTemperamentEnsemble: The sanguine of the group of five.
* FunPersonified: One of his character songs is about having a fun time. His adventurous attitude is what gets the plot going. [[spoiler:This may be because his parents were incredibly strict about his studies back in middle school, to the point that he had nothing fun in his life.]]
* TheGadfly: Often plays around with Makoto and Rei. He's also fond of poking fun at Gou's name.
* GoofyPrintUnderwear: Nagisa has penguins on all his underwear.
* TheHeart: He's the reason the Iwatobi swim club was resurrected, tries his level best to make sure everyone gets along, and has amazing interpersonal skills. [[http://aitaikimochi.tumblr.com/post/113882760126 Not even Sousuke can resist him.]]
* HeterosexualLifePartners: With Rei. They're very close friends after Rei joins the team, and are almost always together.
* InTouchWithHisFeminineSide: His room is... girly, to say the least, and he owns a pink cell-phone; apparently, being forced to dress up like a girl and wear make-up by his older sisters helped him awaken his feminine side.
** To say the ''most'' about his room, it was based off of a [[https://s-media-cache-ak0.pinimg.com/564x/74/97/f2/7497f2a9c8745514bd5fa50f4e96a942.jpg furniture catalog photograph]] of a model bedroom for girls.
* UsefulNotes/JapaneseHonorifics: Nagisa refers to everyone with the honorific "-chan", which is used to express closeness, fondness, and affection. "-chan" is typically added to the end of a girl's name, but can be added to a boy's name. Ironically, Nagisa is the only one of his inner circle of friends not to be referred with the honorific "-chan", instead, he is the only one to be given the honorific "-kun" which is basically the same as "-chan" but is typically given to boys, and Rei is the only one to refer to him as "Nagisa-kun".
* {{Keet}}: He is generally energetic, cheerful and bubbly.
* MoeStare
* NiceGuy: He acts kindly towards everyone and gets along with a lot of people.
* TheNicknamer: Haruka = "Haru-chan", Makoto = "Mako-chan", Rin = "Rin-chan/Rin-Rin", Rei = "Rei-chan", Gou = "Gou-chan".
** He calls Nitori "Ai-chan," as shown in the premiere of season 2.
** He calls Sousuke "Sou-chan" in the post-season 2 OVA.
* NoSenseOfPersonalSpace: Nagisa gets pretty touchy-feely with his friends, Rei receiving the brunt of it.
* OlderThanTheyLook: Downplayed. Appears younger than the other four, but is actually older than Rei.
* OutnumberedSibling: Has three older sisters.
* ThePollyanna: Quite the cheerful one.
* RealMenWearPink: He wears a fair amount of pink for a boy.
* TheRunaway: [[spoiler:He briefly runs away from home after his parents try to force him to quit the swim club.]]
* ShamelessFanserviceGuy: He has no problem with getting naked to play around in the pool.
* SkinnyDipping: He does this in the first episode.
* SleepCute: He falls asleep on a train and his head rests on Haruka's shoulder.
** The picture at the end of Episode 3 has him doing this with Rei.
* SmarterThanYouLook: Can be very manic and dreamy, but shows good planning and interpersonal skills. Despite how childish he seems, he can be very mature, and he scored a 98 on one of his exams.
* SomethingOnlyTheyWouldSay: After not seeing him for 3 years, Haruka and Makoto recognize him when he addresses them as "Haru-chan" and "Mako-chan".
* StaticCharacter: Nagisa remains the same throughout the series, he starts out bubbly and cute and is bubbly and cute consistently through the story, he's also the only one of the main characters as of episode 11 to not have an episode feature his CharacterDevelopment or past, aside from the brief moments he is seen as a kid in Haruka, Makoto, and Rin's memories. He gets more development in the second season.
* StepfordSmiler: [[spoiler:In episode 5 of season 2. See Education Mama above.]]
* SweetTooth: He is ''extremely'' fond of sweets, especially anything that includes strawberries or is strawberry-flavoured. He even piles strawberry-flavoured protein powder onto some noodles in episode 8 of ''Eternal Summer'', much to Makoto and Rei's disgust.
* TearsOfJoy: During episode 12, he cries tears of happiness when their team wins the relay with Rin.
* TechnicolorEyes: Pink.

[[folder:Rei Ryugazaki]]
->'''Voiced by:''' Creator/DaisukeHirakawa, Creator/YokoHikasa (young) (Japanese), Creator/JMichaelTatum (English)

An intelligent, serious first-year, originally part of the track and field team, but eventually pulled into the swim team by Nagisa. His medley style is the butterfly stoke.
* AcademicAthlete: Both a bookworm and a sports star.
* AgentPeacock: In the ED, with his bright red feather cap and a rifle. In the show itself, he wears a brightly-colored speedo at first, and in one scene a body suit covered in purple butterflies (his animal theme). He's also even more muscular than the others, and an excellent pole-vaulter (too bad he can't swim.)
* AlliterativeName: '''R'''yu '''R'''yuzaki.
* AnimalMotifs: Butterfly. It's also the only stroke he can do, at least until he's tutored exhaustively in the second season.
* AwesomenessByAnalysis: He uses Physics to get ahead in Track. However, it's shown that doing this doesn't always help him, especially when he tries to apply it to swimming.
* {{Bookworm}}: Shown in more than one scene to be reading a book.
* CharacterTics: [[AdjustingYourGlasses Nudging his glasses.]] [[http://gfycat.com/GoldenEmptyHoneycreeper Even if he isn't wearing them.]]
* ChewingTheScenery: "Over-the-top" does not even ''begin'' to describe him, especially when he's upset... which is about half the time he's onscreen.
* TheComicallySerious: Most of Rei's humor comes from the fact that he takes ''everything'' so damn seriously.
* CoolShades: Wears orange wraparounds with his track uniform.
* CripplingOverspecialization: Butterfly is the ''only'' stroke he can perform properly. He sinks to the bottom with the other three strokes, and it's really weighing him down in Episode 3 of ''Eternal Summer''. [[spoiler:He does improve on it though, thanks to having private lessons with Rin.]]
* TheDandy: A variation; he's not afraid to work out, but he's obsessed with ''looking beautiful'' as he does so, which is the reason for his initial rejection of swimming, since in his mind the sport involves a lot of unsightly body undulation and desperately gasping for air. Another reason his choosing butterfly is baffling--along with being ridiculously difficult for a beginner, it's probably the hardest to make look pretty.
* EmbarrassingNickname: In the preview for episode 11, Rin refers to him as "Speedo Megane", the "Speedo" part referencing the fact he was wearing a speedo when he first met Rin and "Megane" is the Japanese word for "glasses", so it's a reference to his glasses; Rei was embarrassed hearing this to say the least.
* EpicFail: His attempts to swim anything other than Butterfly in Season 1. ''Especially'' the "dive" (read: flop) into Samezuka's pool at their first joint practice.
* {{Expy}}: Blue hair, glasses, [[TheSmartGuy the smart one in group]] with dorky side, and can't swim at first to lesser extent. Grown-up [[Anime/DigimonAdventure Kido Joe]]?
* ForgotICouldntSwim: [[YouDidntAsk He tries to hide]] that he doesn't know how to swim and attempts to compensate by analyzing how it's done. It doesn't work.
* FourTemperamentEnsemble: The choleric of the group of five.
* HeroicSacrifice: Not the death kind, obviously. In Episode 12, he gives up his spot on the relay team so Rin can swim with his teammates again.
* HeterosexualLifePartners: With Nagisa. After Rei joins the team, they become close friends and are usually working or hanging out together. Although the heterosexual part is very much debatable in his case.
* IdiotBall: Episode 5. Despite being a raw beginner who's only ''just'' learned to swim, Rei decides to do some extra long-distance swim training alone, in the ocean, in the middle of the night when everyone else is in bed, and does not so much as bother to leave a note about where he's gone. Then a random storm rolls in...
* {{Keigo}}: He uses very polite language, even when he's angry.
* KirkSummation: Gave a passionate one against Rin in Episode 11, questioning why he decided to do a relay against Iwatobi when Rin swore not to swim with Haruka again.
* LargeHam: He tends to be this when he's particularly worked up about something, namely sports.
* OpaqueLenses: Whenever he gets flustered.
* PurpleEyes: Averted. Despite having purple eyes, it seems like the only purpose of having them is to correspond with his character color.
* SayingSoundEffectsOutLoud: While tailing Rin at the festival, he goes ''Sasasasa!''. A clear master of stealth.
* SempaiKouhai: Kouhai to Makoto's senpai.
* SirNotAppearingInThisTrailer: He was not in the original PV, only showing up in the second ad. This means he missed out on most of the giant "SWIMMING ANIME!!!" pre-release hype, and has had much less advertisement than the other characters so far. People who aren't watching the anime probably only heard about the original four boys.
* SixthRanger: An odd case. According to the cast biography, not only did he recently switch from track to swim team, he's the only person not a part of the original ChildhoodFriends ensemble, and thus likely to have the perspective of an outsider. It's possible that Rin could fill in the role instead, though, as the same biography points out that his former childhood friends feel as if they don't understand him anymore.
** Because of this status he actually shares some different, oddly refreshing, views compared to his team mates. ''Especially'' with things related to Rin. His thoughts on Rin aren't tinted with nostalgia, so he's a little harsher in his opinions on Rin's obnoxious {{Jerkass}} behavior. He's also the only one to notice and actually feel put out by the fact the team's original goal to do well in the nationals has become related to beating/keeping up with Rin, instead of just having a good time and being proud of what they can achieve.
* SmartPeopleWearGlasses: Played with. He is excellent at deduction, math, and applying formulas, but often acts like an enormous dork at times.
* StoicSpectacles: Subverted by being a {{Tsundere}}, as well as a LargeHam.
* SuperDrowningSkills: Cannot seem to even ''float'', despite the others' best efforts.
** Actually, he can float; he compares himself to a submarine.
* TechnicianVersusPerformer: Other characters (including his track coach) point out that he pays too much attention to form, theory, and calculation, and it won't help him improve in either track or swimming. He gets inspired to join the swim club upon watching Haru, who is a performer through and through.
* TechnicolorEyes: His are ''purple''.
* {{Tsundere}}: Appears to be a Type A.
* YouGottaHaveBlueHair: Plays it straight.
* YoungerThanTheyLook: Downplayed. Around the same height as Rin, but younger than Nagisa.

[[folder:Gou "Kou" Matsuoka]]
->'''Voiced by:''' Creator/AkenoWatanabe (Japanese), Creator/JamieMarchi (English)

Rin's younger sister, a first-year student. She's attending the same school as Haruka and the others and the Swim Club's manager.
* AudienceSurrogate: Her immediate reaction to Haruka being shirtless is to avert her eyes and insist that good girls don't stare at half-naked guys, but within seconds she's gushing with starry-eyes over his muscles, and has reacted similarly to all other shirtless swimming guys she's seen since. Considering that the main point of the show is FemaleGaze-y half-naked boys, clearly she's acting as the audience here.
* BigBrotherWorship: It's subtle, but she highly looks up to Rin and frequently displays concern for his well-being. In addition, he has her ideal body type in men.
* CordonBleughChef: In episode 4 of ''Eternal Summer'', she makes a very appetizing-looking meal for the team...but it turns out to be stuffed full of chocolate, strawberry and banana-flavored protein powders. Nagisa is the only one who likes it.
* CurtainsMatchTheWindows: Just like her brother.
* CuteSportsClubManager: The manager of the Swim Club; a cute girl among muscular but lean young men.
* DisappearedDad: See Rin's note below.
* DoNotCallMePaul: Gou dislikes being called by her first name, as it sounds very masculine.
* EatingTheEyeCandy: Being the swimming club manager, this happens quite often. And she doesn't necessarily react only in [[ShirtlessScene Shirtless Scenes]]. Just seeing well defined muscles makes her eyes to go into full BishieSparkle mode. See AudienceSurrogate above and {{Fetish}} and {{Otaku}} below.
* EmbarrassingFirstName: Considers being called Gou this, because [[GenderBlenderName it's a boys name]].
* {{Fetish}}: Has a fetish for muscles.
* FieryRedhead: Outspoken and tends to be passionate about things, particularly muscles.
* HairDecorations: The light blue decorations at the base of her ponytail, which are actually two little fish.
* InsistentTerminology: She prefers to be called Kou, which is a more feminine pronunciation of her name, but no one does. In ''Eternal Summer'', however, she stops insisting this and refers to herself as Gou.
* NamedAfterSomebodyFamous: Gou is generally a masculine name, yes, but she's specifically named for [[http://en.wikipedia.org/wiki/Oeyo a female historical figure]].
* {{Otaku}}: A ''muscle'' otaku.
* TeamDad: Despite being female and their manager, she is much more into getting results from the team, like improving their time and following a strict regime, and wants the team to be more ambitious.
* TranquilFury: There's one occasion where Nagisa calls her "Gou" in the middle of a discussion on club business where she sharply cuts him off with ''"It's Kou"'', accompanied by a plastic smile and awkward silence for a couple seconds before she simply resumes the discussion.
* TsurimeEyes: In contrast to Miho's Tareme.
* YaoiFangirl: When Gou sees Rei talking privately with the captain of the track team, [[ComicallyMissingThePoint she immediately thinks Rei is in love with him.]]

[[folder:Miho Amakata]]
->'''Voiced by:''' Creator/SatsukiYukino (Japanese), Creator/CaitlinGlass (English)

Haruka and Makoto's homeroom teacher, who they later convince to become the Swim Club Supervisor.
* TheDitz: She's often a little spacey, and her [[IceCreamKoan literary references]] rarely make any sense.
* IceCreamKoan: Being a literature teacher, she frequently dispenses these.
* MysteriousPast: She was a swimsuit model named "Marin-chan" at one point and quite dismissive [[OldShame whenever its mentioned.]]
* OffscreenTeleportation: Shows up behind Nagisa whenever he mentions her wearing a swimsuit.
* OlderThanTheyLook: If you saw her standing next to her students while they were all wearing civilian clothes, you would think she was another teenager. Justified, since the first episode we learn that she recently graduated college, so she probably isn't ''that'' much older than them.
* PornNames: She went by the name "Marin Nishikujo" during her swimsuit model days.
* ReasonableAuthorityFigure: For example, she sees no problem with the boys sneaking into abandoned buildings, since you're ''supposed'' to adventurous and a little reckless at that age.
* SenseiChan: Her students even call her "Ama-chan-sensei".
* TaremeEyes: In contrast to Gou's Tsurime.
* TranquilFury: Displays this when Nagisa suggests that they get more members for the swim club by having her wear a swimsuit. She even threatens to quit supervising.

[[folder:Rin Matsuoka]]
->'''Voiced by:''' Creator/MamoruMiyano, Creator/AkenoWatanabe (young) (Japanese), Creator/VicMignogna, Creator/MaxeyWhitehead (young) (English)

Haruka's rival and former childhood friend, who went overseas for three years and returned with a different personality. Attends Iwatobi's rival school. He trained in [[JackOfAllStats all four swimming styles]] as a kid, specializing in butterfly. He focuses on free stroke during the events of the anime so he can compete against [[TheRival Haruka]], but swims both freestyle and butterfly individually.
* TheAce: Of Samezuka's team in Eternal Summer, when he's the captain. He sets multiple records, is highly sought-after by universities, and is only ever matched or beaten by Sousuke (in Butterfly, unofficially) or Haru (in Freestyle).
* AlwaysSecondBest: Since childhood, he is regarded as second in skill after Haruka, a point that drives him to travel overseas to swim.
** He was thoroughly outclassed by nearly all of his fellow swimmers in Australia, which crippled his self-confidence and his desire to swim.
* AloofBigBrother: Gou worries about his well-being throughout Season 1, but he rarely interacts with her and is almost as dismissive of his sister as he is of his old friends. He communicates more in Eternal Summer, but Sousuke does chide him and say he should pay more attention to her.
* AnimalMotifs: Occasionally referred to as a shark due to his competitive nature; also resembles one via his teeth.
* AnxietyDreams[=/=]DreamingOfTimesGoneBy: In Episode 7, he has one that begins with his younger self and Gou walking with their father's funeral procession after he died in a typhoon. It proceeds from there with his fear that he'll always be [[AlwaysSecondBest second to Haru]], and that by extension he'll never be able to carry on his father's Olympic dreams.
* BenchedHero: During TheStinger of Episode 11, Seijuurou removes him from the Samezuka relay because his mind is too focused on beating Haru instead of working with his own team.
* BigBrotherInstinct: Towards Gou. It's more obvious in Eternal Summer; he's more [[AloofBigBrother aloof]] and troubled in Season 1, and avoids her nearly as much as he avoids the Iwatobi swimmers.
** In the drama CD based in Season 1, he does mention that Seijuurou shouldn't call other people's little sisters by their first name without first asking permission. Naturally, Rin is referring to Gou. When Seijuurou asks permission to call Gou by her first name (jokingly), [[MySisterIsOffLimits Rin cuts him off with "NO."]]
** Another drama CD scene reveals that he's paranoid over Gou going out every Sunday, thinking she has a boyfriend. When Nitori suggests that Seijuurou likes Gou, Rin immediately confronts the captain, who, says he went to see a movie with "the little sister". Turns out, Seijuurou meant he went to the movie with his own sister.
** In the anime itself he does occasionally demonstrate concern/affection for Gou, such as walking her back to the hotel she's staying in after it turns out both their schools were training on the same island. Still, Sousuke notices that they're not as close as Gou would like and offhandedly tells Rin to spend more time with her.
* BigEgoHiddenDepths: He may be a huge jerk, but it's later shown that there is more to him than he lets on.
* BreakTheHaughty: Rin finally does beat Haru and declares that he'll never swim with him again, but it's obvious that this didn't actually solve any of Rin's issues. Then he sees how the new Iwatobi team swims together, and is clearly [[GreenEyedMonster jealous and bitter]] about the fact that Rei has taken "his place" (butterfly) in the relay and that they can win without him. Rin spends most of Episode 9 breaking down as a result. In Episode 11, his unhealthy obsession with beating Iwatobi gets him kicked off Samezuka's relay team.
* CantCatchUp: While in Australia, Rin had trouble competing again the other swimmers and couldn't even communicate well because of the language barrier. Rin came to the conclusion that he had to do everything alone, and that the relay with his friends was distracting him from his goal. His frustrations eventually led him to quit shortly before the events of the anime, but swimming against Haru in the first episode reignites his drive to swim.
* CharacterTics:
** Snapping his goggles strap. The others recognize him after not seeing him for three years when he does something similar with the strap on the back of his baseball cap. This tic is also an homage to his father.
** He rubs the back of his neck when he's embarrassed or annoyed.
* CheerfulChild: Used to be, but his behavior changed when he went abroad to Australia and became discouraged when most of his classmates were able to swim faster than him. Haruka beating him when he returned to Japan during a school vacation was his breaking point.
* CheshireCatGrin: He tends to do this, to go with his shark-like teeth.
* CryCute: All over the place in episode 12. Generally, it's a known fact among other characters that Rin's a crybaby.
* CurtainsMatchTheWindows: His eyes and hair are both red.
* CuteLittleFangs: As a child. There are also moments during the current events of the anime where his [[ScaryTeeth sharklike teeth]] are less pronounced and look more like cute fangs.
* DeathGlare: He has a nasty one in the first season, but [[TookALevelInKindness not so much]] in ''Eternal Summer''.
* DisappearedDad: It turns out that he died in a typhoon during Rin and Gou's childhood.
* DraggedIntoDrag: Rather than be forced to quit the team, he begrudgingly agrees to take part in the maid cafe. Mikoshiba, Nitori, and even his sister all think [[AttractiveBentGender he wears it well]].
* EmbarrassingNickname: During Elementary School, Haruka and Nagisa called him "Rin-Rin", and he didn't like it at all. When this comes up in High Speed!, Rin explains that he was bullied and called "Rin-Rin" at his old school, and he's scared of being bullied again.
** Nagisa calls him "Rin-Rin" near the end of episode 12, and he doesn't seem to mind.
* EvilRedhead: He's not actually ''evil'', but he is Haruka's rival and quite the {{Jerkass}} in the first season.
* FairCop: During the second EndingTheme, he wears a policeman's uniform. Needless to say, he looks pretty good in it.
* FourTemperamentEnsemble: The Choleric of the group of five.
* GreenEyedMonster: Despite the fact that he initially ignored Nagisa and Makoto in favour of challenging Haruka, he is ''not'' happy when he realises that "his" place in the relay team (the butterfly stroke) has been taken by Rei. When he watches the relay, he admires his old friends' trademark swimming styles...but snarls all the way through Rei's leg of the race, considering him unworthy of being in the same team as the other three. Rin seems genuinely taken aback at how much this upsets him, having thought that beating Haruka would solve everything.
** He gets over it by the end of the season. In the next season, he teases Rei when he sees that they're both swimming butterfly, and [[spoiler:spends quite a bit of time and effort teaching Rei to swim other strokes when he asks]].
* HardWorkHardlyWorks: Travels all the way to ''Australia'' to get the necessary training to beat Haruka. When he comes back to Japan to start highschool and beats Haruka, he becomes upset—most likely because Haruka didn't seem to put in his utmost effort (or he just didn't even care that he lost, because he doesn't care about winning or losing). He doesn't fully accept this as a satisfying win because either Haruka went easy on him, or, because Haruka just wasn't devastated by the loss like Rin would have been. Later, it's revealed that he returned to Japan every so often, and once challenged Haruka when they both went to see their old club. He lost to him ''again'' and then [[SoreLoser told Haruka he was quitting swimming]].
** It's also addressed in Episode 4 that Rin has been training much harder and is in better physical condition than Haruka, which in Rin's opinion, makes his win pointless.
** Played with at the end of Episode 7, Haru trained to keep going on personal bests before the prefectural tournament, but Rin won in their seed and swore he wouldn't swim with him anymore. However, Haru hasn't been seriously training for years because of the above-mentioned incident that ended in Rin quitting. Haruka only had a month or so to train, ultimately making ''this'' victory hollow, too.
** In Episode 11, he reveals that he blames swimming in a relay for affecting his performance since no matter how hard he practiced, he couldn't get the results he wanted.
* {{Jerkass}}: After meeting his team mates for the first time in years, he insults Haruka for still hanging out with Makoto and Nagisa, the latter two he doesn't even acknowledge. After an unsuccessful attempt to race Haruka, he takes the trophy they had worked so hard for as children and tosses it aside, saying he doesn't need it anymore.
* JerkassFacade: "Eternal Summer" Rin seems quite a contrast to the first season. He's often aloof and tends to stare in disbelief or get annoyed with minor things or anyone being [[MySisterIsOffLimits interested in Gou]], and... that's about it.
* JerkWithAHeartOfGold: As it turns out, he's really not that bad and is dealing with some significant personal issues that he eventually works through. He also shows genuine concern about Makoto facing the ocean in Episode 5, and has a couple of PetTheDog moments with Nitori.
* KindheartedCatLover: Nitori observes Rin taking in a stray cat from the rain and feeding it mackerel in the old swim club building. Kindhearted... deep down.
* LastNameBasis: He refers to Nitori exclusively by his family name for most of Season 1. They graduate to FirstNameBasis in episode 12; Rin calls Nitori the AffectionateNickname "Ai", and Nitori switches from "Matsuoka-senpai" to "Rin-senpai".
* LightIsNotGood: The Samezuka uniform is mainly white, and he's the closest thing to an antagonist in Season 1. Later subverted and ultimately averted once his HeelRealization kicks in near S1's end, and [[JerkWithAHeartOfGold becomes a]] [[HeelFaceTurn much better person]] by the time ''Eternal Summer'' rolls around.
* MySisterIsOffLimits: Comes up more than once in the drama [=CD=]s during interactions with his captain.
** In ''Eternal Summer'', he also has this attitude towards Momotarou who is much more direct in his attempts at flirting with Gou, which often translates to Rin unceremoniously dragging him away.
* PetTheDog: Calls Nitori by his first name in episode 12, to Nitori's delight. There are other moments in Eternal Summer.
** Pretty constant through the second season, where he has the merest JerkassFacade.
* RedOniBlueOni: The red to [[TheRival Haruka's]] blue.
* ReplacementGoldfish: Rin feels like the "replaced" part of this trope when he watches Rei swim butterfly in Iwatobi's relay team.
** Played with when ''Rin'' replaces ''Rei'' in the final relay.
* TheRival: Pre-air material really wants to drive it home that he fills this role for Haruka--not only is it the introductory line of his profile, but in a chart mapping cast relations, Rin has [[http://www.animenewsnetwork.com/news/2013-04-26/kyoto-animation-free-swim-team-anime-promo-streamed an isolated red box (being from a rival school and all) surrounding him with an arrow pointing only toward Haruka]] (and vice versa) with the words "RIVAL" written above it, and glaringly, he seems to have no interest in anyone else, and they in kind have no arrow relating to him.
* ScaryTeeth: As a teenager.
* SecurityBlanket: The after ending, next episode character commentary reveals Rin can't sleep without his pillow.
* SelectiveObliviousness: Rin adamantly chooses to believe that [[spoiler:Sousuke can and should return to competitive swimming, despite a severe, movement-inhibiting injury that actual medical professionals have failed to fix for two years]].
* SempaiKouhai: The senpai to Nitori.
* SlasherSmile: Oh ''yes.''
* SoreLoser: His inability to accept Haruka's victory back when they were kids is what destroyed their friendship in the first place. Over the course of season 1, it gets worse before it gets better.
* SpiritedCompetitor: He thrives on challenge and competition.
* StepfordSmiler: Episode 12 of ''Eternal Summer'' reveals that he was this during his time in Australia, putting on a cheerful face despite having trouble adjusting to a different country.
* TechnicianVersusPerformer: A mild example of a technician in contrast to Haruka's intuitive performer. He consistently weight trains in order to supplement his swimming skills (and even chastises Haruka about not focusing enough on gaining a stronger build). He also frequently reads books about improving swimming techniques.
** In season two he's more like the performer to Sousuke's very strict technician, in that he takes enjoyment in swimming with and helping his friends, rather than believing that the only meaningful thing to do with that time and effort is self-train.
* TookALevelInJerkass: After coming back overseas. It is hinted in his talk with Rei and the end card in Episode 11 that disappointment after disappointment of his swimming combined with being alone in a foreign country was enough to make the once idealistic, cheerful child the jaded teen we see today.
* TookALevelInKindness: After the climax of episode 12. He still shows traces of grumpiness, but he's much friendlier and more open with his emotions.
** Shown fully in ''Eternal Summer''; while still be a bit grumpy and his general personality is the same, he is much more openly friendly and nice, smiles ''far'' more than his first season self did, actually laughs in some scenes, and is openly supportive towards Nitori and Rei when they need it. He's only ever aloof and hostile towards Momotarou, and that ''far'' less than in season one, showing mostly when Momotarou is particularly absurd.
* TroubledButCute: His attractiveness is commented on in-universe, and most of the anime he can't hide his frustration about his swimming ability.
* {{Tsundere}}:
** Even after episode 12, his sister and Nagisa both outright say he needs to be more honest with his feelings. Nitori even calls him one once.
** More specifically, a platonic example towards the Iwatobi team. Sosuke points out, when Rin complains about them calling him for a favor, that he might complain, but he'll do it anyway.
* TurnOutLikeHisFather: Rin began to swim competitively because he wanted to live out his father's missed out dream as an Olympic swimmer. His father decided to put off his swimming career so he would be able to support his family and properly raise his son and daughter, but he died when his fishing boat was caught in a typhoon. Rin feels like he has to be a great swimmer and make up for the opportunities his father lost.
* UsedToBeASweetKid: Prior to his three years overseas.
* VitriolicBestBuds: With Haruka (as of Eternal Summer, evident in episode 12), and Sousuke.
* WeUsedToBeFriends: Was once good friends with Haruka, Makoto, and Nagisa before going overseas and coming back completely changed.
** He goes back to being their friend in episode 12.

[[folder:Seijuurou Mikoshiba]]
->'''Voiced by:''' Creator/KenjiroTsuda (Japanese), Creator/RobertMcCollum (English)

The Samezuka swim team captain.
* BoisterousBruiser: Episode 8 reveals he makes good on his boisterous nature by being a ''very'' competent swimmer, setting a new tournament record in his prelim.
* CommutingOnABus: In the second season. He graduates in the first episode, so he's obviously absent from the school and training scenes. However, he still shows up from time to time to check on his old team.
* DarkSkinnedRedhead: He has the darkest complexion of all the named characters, with red-orange hair.
* DoggedNiceGuy: He has a crush on Gou and even tries to ask her out a couple of times. She doesn't seem interested, though.
* HopelessSuitor: Since he's written out at the beginning of Season 2, there's not much hope for him to actually have anything going on with Gou.
* LargeAndInCharge: The tallest and most muscular of the Samezuka team and also their leader.
* LoveAtFirstSight: It is implied that he falls in love with Gou when she came to look for Rin before he joined the swim team.
* PassingTheTorch: He graduates at the beginning of ''Eternal Summer'' and passes the title of team captain to Rin.
** He also passes the role of Gou's HopelessSuitor to his younger brother (Momo).
* RatedMForManly: Him and Sousuke are the most masculine members of the cast, although he represents a more upbeat side of masculinity.
* SugarAndIcePersonality: He's extremely strict and serious when it comes to his team, but when interacting with Gou or the original Swim Club members he's surprisingly {{Adorkable}}.
* SweetTooth: Nitori mentions all the sweets he eats at the squid festival.

[[folder:Aiichirou Nitori]]
->'''Voiced by:''' Creator/KoukiMiyata (Japanese), Creator/JoshGrelle (English)

A first-year on the Samezuka swim team and Rin's roommate.
* AffectionateNickname: "Ai". Rin calls him this in episode 12 (progressing to FirstNameBasis), and continues to do so in Eternal Summer.
** Nagisa calls him "Ai-chan" in Eternal Summer, about which he's less pleased because he feels that Nagisa is being too forward.
* AnimalMotifs: Duck.
* BeautyMark: He has one under his right eye.
* CovertPervert: The second [=FrFr!=] shows that he has a porn magazine lying around his books.
* DidIJustSayThatOutLoud: Tends to say parts of what he's writing in his diary out loud with Rin nearby. Given that most of what Nitori writes is about Rin, he's left to stammering denials.
* DiggingYourselfDeeper: When Rin is annoyed about the joint practice with Iwatobi, Nitori says that the Iwatobi boys all have girly names. Rin, who just ''happens'' to also have a girly name, is not pleased.
** Does it again in Episode 4, when praising Haruka and saying that success "all comes down to talent". He gets a particularly vicious DeathGlare from Rin for that.
* DoggedNiceGuy: ''Extremely'' dogged.
* {{Expy}}: Looks very similar to Masato from ''VisualNovel/UtaNoPrinceSama'': both have the same hairstyle and have beauty marks under their right eyes.
* HardWorkHardlyWorks: Seems to believe this. He says at one point that success all comes down to talent because he doesn't seem to be improving. This attitude does ''not'' go over well with Rin. He changes his tune in Eternal Summer and is shown training himself at night to improve his times.
* JackOfAllStats: His usual event is the Individual Medley.
* LastNameBasis: He refers to Rin as "Matsuoka-sempai". They graduate to FirstNameBasis in episode 12, and Nitori calls Rin "Rin-sempai" from that point onward.
* TheRival: Nagisa's in season 2, as Nitori is beginning to specialize in two strokes like Rin, the second being the breaststroke, and in the opening the two are seen competing against each other in the relay.
** In episode 2, Iwatobi and Samezuka have a non-official relay against each other at the revival of the Iwatobi SC, he and Nagisa go against each other in the relay Nagisa's stroke is shown to be faster and more refined than Nitori's, and Nagisa beats him in their leg of the relay.
* SenpaiKouhai: Refers to Rin as "Matsuoka-senpai" and [[FirstNameBasis later]] "Rin-senpai". In Eternal Summer, Momo calls him Nitori-senpai.
* StalkerWithoutACrush: Rin accuses Nitori of stalking him at one point in Season 1, and Nitori doesn't even deny it. His behavior also occasionally gives the impression of [[StalkerWithACrush stronger feelings]].

[[folder:Sousuke Yamazaki]]
->'''Voiced by:''' Creator/YoshimasaHosoya, Creator/AoiYuki (young) (Japanese), Creator/IanSinclair, Ryan Reynolds (young) (English)

An old friend of Rin's who transfers to Samezuka in the second season.
* AnimalMotifs: Whale Shark.
* BerserkButton: ''Do not'' threaten Rin or interfere with his swimming. He also scares the living hell out of Nitori after the latter unintentionally sprays Gou with his water gun.
** In ''Starting Days'', He has to be physically restrained when he feels like Haruka isn't trying in the first tournament.
* BigBrotherInstinct: He's very protective of Rin, even though they are more or less the same age.
** His relationship with Gou has shades of this as well, especially when he tells Rin to spend more time with her and [[YouMustBeCold gives her his jacket]] after Nitori accidentally sprays her with a water gun in episode 14.
* TheBigGuy: He's the best swimmer in Rin's team and the most physically imposing, being impressively muscular and the only main character taller than Makoto and Seijuurou.
* BrokenAce: He's an incredibly talented, powerful swimmer who is nationally-ranked for Butterfly. He's also intimidating, has limited social skills with everyone but Rin, and [[spoiler:has a CareerEndingInjury to his shoulder]].
* CareerEndingInjury: [[spoiler:There is major {{Foreshadowing}} throughout the season in the way he uses his left shoulder, and in episode 8, Kisumi reveals that Sousuke has a serious injury to his ''right'' shoulder. In episode 10, Sousuke reveals to Rin that he damaged it in his first year of high school due to pushing himself too hard with increasingly intense training. And because he never stopped training to address the problem, the joint has broken down to the point that it can't be fixed.]]
* CharacterTics: Twisting his shoulder [[spoiler:because of his GameBreakingInjury.]]
* ChildhoodFriends: With Rin. They've kept in touch since Rin left for Australia, but Sousuke clearly misses him and is angry with Haru for not working hard because he takes it as an insult toward Rin's efforts to improve his swimming.
* DeadpanSnarker: In ''Starting Days'', he says that the letter from Rin must be for Haru because it's written as though Rin doesn't expect to get a response, and Sousuke always writes back.
* DeathGlare: He's got a vicious one, generally reserved for Haruka.
* DefrostingIceKing: A non-romantic example as he develops from a closed-off and intimidating loner to a TeamDad for the Samezuka relay team. Eventually, he even warms up to the Iwatobi team, most obviously in ES 14.
* DentedIron: [[spoiler:Overtraining led to a shoulder injury. Numbing the pain and ''continuing'' to train intensely caused permanent damage to the joint and will prevent him from ever swimming professionally.]]
* {{Determinator}}: Deconstructed. [[spoiler:Training and working himself past his limits despite a serious joint injury exacerbates it to the point that he will never swim competitively again]].
* {{Foil}}: To Makoto. They both fill the roles of TheBigGuy and childhood friend of the team's freestyle swimmer. But where Makoto is timid and universally friendly, Sousuke is blunt and intimidating. Conflict is an alien concept to Makoto and Haruka, but Sousuke and Rin "fight all the time" ''because'' of their intense personalities and how much they care about each other. Makoto only competes against Haru once, and decides not to do it anymore because their friendship isn't about challenging each other; Sousuke and Rin's friendship thrives on competition, but Sousuke [[spoiler:''has'' to stop because he's physically broken]].
* {{Foreshadowing}}: [[spoiler:For much of the season, he's seen stretching and rolling his left shoulder but never his right. He also never competes in individual events, despite the fact that he disliked the relay when he was younger and is nationally-ranked for butterfly. It turns out that he has a CareerEndingInjury to his right shoulder and all he wants is to swim the relay with Rin for as long as he can; butterfly puts immense strain on the shoulders, so he limits the amount of time he spends swimming it at top speed]].
* GameBreakingInjury: [[spoiler:Sousuke is a national-top-ten ranked swimmer who leaves a prestigious high school legendary for its swim team to join Rin's team at Samezuka. His CareerEndingInjury acting up just as he passes Rei is the only reason he doesn't give Rin a major advantage going into the freestyle leg of their relay at regionals.]]
* GreenEyedMonster: Even though he never says it outright, Sousuke's brief and far-between interactions with Haru clearly display his intense jealousy of Haru's importance in Rin's life, a position that Sousuke wants for himself. In ''Starting Days'', when he gives Haru the letter from Rin, he's obviously jealous of the way Rin talks about Haru.
* HugeGuyTinyGirl: Non-romantic between him and Gou.
* {{Hunk}}: Unlike [[{{Bishonen}} the other characters]], he fits squarely into this trope thanks to his height and build.
* IneffectualLoner: The most aloof and solitary of the main cast, and also the one [[spoiler:hinted to have lost everything in the end]]. It's also shown that being a loner since Rin left for Australia may have resulted in competitive success, but it also [[spoiler:drove him to a CareerEndingInjury]].
* JerkWithAHeartOfGold: He's a bit gruff and blunt, and he is willing to threaten and intimidate Haru, but he does so for Rin's sake, and the way he interacts with Rin and Nitori suggests he's not all bad.
* ManHug: Him and Rin have their own version of this which includes faking to punch each other.
* NewTransferStudent: He transfers into Rin's class at Samezuka at the end of Eternal Summer's first episode.
* PerpetualFrowner: You can count on one hand the times Sousuke actually cracks a smile, especially when he's not alone with Rin.
* RatedMForManly: Along with Seijuurou, the most masculine member of the main cast.
* ShowerOfAngst: [[spoiler:At the end of episode 9, after he aggravates his shoulder injury.]]
* SourOutsideSadInside: He's unfriendly (even threatening in Haru's case) toward everyone except Rin and eventually the rest of the Samezuka relay team. [[spoiler:Turns out he has a CareerEndingInjury that has eliminated any chance he once had to swim professionally, and he can only bring himself to put on a nice face for Rin]].
* TallDarkAndHandsome: Just look at the picture! He's the tallest in the cast and very attractive, though not particularly charming.
* TaremeEyes
* TeamDad: Almost everything about his behaviors reflect this in him. From his overprotectiveness of Rin (especially when confronting Haru in ES episode 2) to the way he acts around the other Samezuka swim team members. There are even long posts on tumblr about how he wears "dad outfits."
* ToughLove: Toward Nitori on two occasions.
** He goes out at night and finds Nitori sitting on the stairs, upset about his lackluster times. Sousuke grouches at him for self-pity, but follows it up with the advice that Nitori has potential and shouldn't crush it before he even tries.
** When he catches Nitori swimming at night, Sousuke walks up to the side of the pool and informs Nitori that fatigue is ruining his form. When Nitori tries to argue, Sousuke says he'll coach for the rest of Nitori's practice, but only ''after'' he takes a break. [[spoiler:All the more touching with TheReveal that Sousuke caused permanent damage to himself by overtraining, and he's trying to stop Nitori from making the same mistakes]].
* TrainingFromHell: Deconstructed. After parting ways with Rin in middle school, he went off to rigorously train himself so that one day he would compete with him. He ''did'' become a nationally-ranked Butterfly swimmer, [[spoiler:but he also damaged his right shoulder to the point that he'll never be able to swim professionally.]]
* TroubledButCute: Invoked through Gou's reaction to his usally aloof and dismissive attitude.
* VitriolicBestBuds: According to Rin, they "fight all the time", and their secret handshake involves fake punching each other. Sousuke also makes fun of Rin for being a {{Tsundere}} ("You complain, but you're going to do it for them, right?"), and Rin kicks him on a semi-regular basis.
* WatchingTheSunset: [[spoiler:During the WhereAreTheyNowEpilogue, Sousuke is the only one whose sequence hints a BittersweetEnding. He's only seen watching the sunset all alone on a deserted quay, hinting that his swimming days are probably over, despite Rin's encouragements, and that he may have to go his own way and start a new life, on his own.]]
* WhatTheHellHero: He's ''pissed'' when he swims free against Haru and beats him easily, because he thinks Haru is mocking him and not taking the competition seriously.
* YouMustBeCold: In Episode 14, he gives his jacket to Gou after Nitori accidentally sprays her with a water gun.

[[folder:Momotarou Mikoshiba]]
->'''Voiced by:''' Creator/KenichiSuzumura (Japanese), Creator/JerryJewell (English)

Seijuurou's younger brother, and a first-year who joins the Samezuka swim team in the second season. He is the "fearsome new face" his brother referred to.
* AlliterativeName
* AnimalMotifs: Sea otter. It even applies InUniverse, since he's been nicknamed "the Sea of Japan's Sea Otter".
* BeetleManiac: One of his hobbies is catching stag beetles. In Episode 11 he even asks Rin to give Gou a stag beetle he caught for her himself.
* CasanovaWannabe: Probably, since during his first appearance he mentions wanting to see cute girls which was the only way Rin could convince him to come to the Splash Fest. And since he does things like [[https://31.media.tumblr.com/d452bb2b3c8a1f44017c5b0f93b40609/tumblr_inline_n8grhsONbp1rsn40w.png this]], he probably doesn't get many admirers.
* FieryRedhead: He's constantly energetic and doesn't ever seem to calm down.
* InSeriesNickname: His teammates call him "Momo".
* {{Keet}}: He's probably even ''more'' energetic than Nagisa, albeit in a more HotBlooded way.
* LegacyCharacter: He's much like a younger version of his brother. He also somewhat replaces him as Gou's suitor in the show.
* LoveAtFirstSight: Like his brother, with Gou.
* LuminescentBlush: Whenever he's around Gou but, unlike most examples, he's more likely to proposition Gou, especially to her brother's face, than acting clumsy and/or aloof.
* MeaningfulName: He's named after the titular character of the Japanese folktale ''Literature/{{Momotaro}}''.
* RealMenWearPink: A big percentage of his casual wardrobe seems to include bright pink shirts
* RunningGag:
** Gou has difficulty remembering his name.
** Whenever he talks to Gou, he has a habit of rattling off random facts about himself, like his hobbies and favourite foods, which is a classical way of presenting oneself as a potential suitor in Japanese culture.

[[folder:Kisumi Shigino]]
->'''Voiced by:''' Creator/ChihiroSuzuki, Creator/RinaSato (young) (Japanese), Creator/EricVale, Creator/TiaBallard (young) (English)

An old middle school friend to Haru and Makoto. He reunites with them in ''Eternal Summer'' when Makoto begins teaching his little brother Hayato how to swim. He has more focus in ''Starting Days'', where he is shown to be an avid basketball player.

* InnocentInnuendo: His name is one of them, sounding like the English "kiss me".
* InnocentlyInsensitive: One of the first things he says to Haru when they meet up again is how he remembers Haru being sad about Rin leaving for Australia.
* {{Keet}}: Not as small as your average keet, but when it comes to cheerfulness and enthusiasm, he's up there with Nagisa.
* NiceGuy: Undeniably friendly to everyone he comes across.
* NoSenseOfPersonalSpace: He has the habit of wrapping his arm around people's shoulders and clinging to them. Haru takes it in stride.
* RoseHairedSweetie: A RareMaleExample. His hair is a light peach color, fitting his cheerful, caring, and affable personality.

[[folder:Asahi Shiina]]
!!Asahi Shiina
->'''Voiced by:''' Creator/ToshiyukiToyonaga (Japanese), Christopher Llewyn Ramirez (English)

%% [[caption-width-right:350:some caption text]]

A boy with a bright personality and a luck-pusher. Asahi is one of Haruka's classmates in middle school, and from the moment he sees him wants to recruit Haruka into the swim club. His best swim style is the butterfly, but he can swim all other styles well, something he takes extreme pride in.
* TheAce: Thinks of himself as this. Which gets knocked down as he struggles to swim freestyle again.
* {{Adorkable}}: In spite of how cool he ''thinks'' he is.
* AnimalMotifs: A monkey, to his chagrin.
* BookDumb: The boy does not know how libraries work.
* ButtMonkey: Often the movie's main source of humor, usually at his expense.
* CompetitionFreak
* CryCute: [[spoiler:He anguishes to Nao how he fears he may lose his other swimming talents and cries on his shoulder.]]
%%* FieryRedhead
%%* HotBlooded
* HowDoIShotWeb: In the middle of practice, he suddenly forgets how to swim freestyle. [[spoiler:He later realizes it's because he was too intimidated by Haruka's superior freestyle. Once he realizes that Haru is human, he's able to swim it again.]]
* {{Keet}}: He's the most enthusiastic about joining the swim club.
* VitriolicBestBuds: What he and Ikuya eventually become.

[[folder:Ikuya Kirishima]]
!!Ikuya Kirishima
->'''Voiced by:''' Creator/KoukiUchiyama (Japanese), Lee George (English)

%% [[caption-width-right:350:some caption text]]

Moody and distant, Ikuya is the exact opposite of Asahi both in personality and mindset. He initially hates the idea of joining the school's swim club, stating that school clubs are childish compared to a real club. It just so happens his older brother is the captain of the school's swim club, and the two have an icy relationship.
* AnimalMotifs: Never mentioned, but the director compares him to a cat. His eyes are very cat-like.
* DeadpanSnarker: Particularly towards Asahi.
* FriendlessBackground: Had no friends (other than his brother) before joining the swim club.
* InelegantBlubbering: [[spoiler:After his teammates' YouAreNotAlone speech.]]
* InterruptedSuicide: [[spoiler: Asahi tackles him to the ground while on a bridge. Subverted in that Ikuya wasn't actually committing suicide, but was looking for his old swim club building.]]
* NotSoAboveItAll: For all his talk against Asahi's childishness, Ikuya's got his own immature side. Which shows up in him imitating Haruka. [[spoiler: And he does so in the hopes his brother, who praised Haruka, will notice him.]]
* PeekABangs: His bangs mostly cover his right eye.
%% * SourOutsideSadInside:
* {{Tsundere}}: Can be thought of like Haruka minus TheStoic.
* [[WhenSheSmiles When He Smiles]]: [[spoiler:After Asahi's clumsy attempt to offer his shirt for crying on, he goes from crying to laughing, getting the widest smile on his face.]]
* VitriolicBestBuds: He and Asahi eventually become friends, but he still holds a sharp tongue against him.

[[folder:Natsuya Kirishima]]
!!Natsuya Kirishima
-> '''Voiced by:''' Creator/KenjiNojima (Japanese), Ricco Fajardo (English)

%% [[caption-width-right:350:some caption text]]

The swim team's brash but charismatic captain. Natsuya sees an opportunity with the four 1st-years swimming styles and wastes no time assigning them as a medley team. He treats everyone on the team amiably, but his behavior around his younger brother is cold.
* AloofBigBrother
* BigBrotherMentor: To Ikuya when they were younger. Now he's this for everyone but him.
* {{Expy}}: His role is similar to Seijuurou's at Samezuka in [[{{Anime/Free}} the original series]]. They're both HotBlooded team captains as well as BigBrotherMentor types. Unlike Seijuurou, Natsuya captains the team during his little brother's first year, and they're [[AloofBigBrother not on great terms]].
* HotBlooded: His reaction to Haruka refusing to swim in the medley is to strip and challenge Haru to a race.
* JerkassFacade: [[spoiler:He really just wants Ikuya to go out and make friends, instead of tagging behind him always.]]
* RedOniBlueOni: The fiery counterpart to Nao's calm.
* SempaiKohai: Being a 3rd year, he's the sempai for the main characters.
* TeamDad: Naturally, as the captain of the swim club.

[[folder:Nao Serizawa]]
!!Nao Serizawa
-> '''Voiced by:''' Creator/SatoshiHino (Japanese), Oscar Seung (English)

%% [[caption-width-right:350:some caption text]]

The swimming club's manager. In contrast to the captain, Nao's personality is calm and gentle. Possesses a strong knowledge of swimming.
* TheAce: People wonder why he's only the club's manager, because it's obvious that he's athletic and talented. [[spoiler:Turns out he was the team's best swimmer, but his eyesight started going bad due to retinal detachment and he had to stop swimming until he could have surgery and time to recover]].
* ArmorPiercingQuestion: Unwittingly does this to Makoto when he questions his motivation for swimming.
* GameBreakingInjury: [[spoiler: Like [[BrokenAce Sousuke]] in the original series, Nao noticed but ignored a health problem until it became so serious he had to stop swimming. Fortunately, unlike Sousuke's [[CareerEndingInjury permanently damaged shoulder]], Nao's injury (retinal detachment) should not hinder him in swimming once he's recovered from surgery]].
* IllBoy: [[spoiler:The reason he doesn't swim anymore is because one of his retinas has been detaching, revealed when he's in the hospital.]]
* RedOniBlueOni: The calm counterpart for Natsuya's brashness.
* SempaiKohai: Being a 3rd year, he's the sempai for the main characters.
* TeamMom: The knowledgeable, caring (yet somewhat witty) manager of the swim club.
* WiseBeyondTheirYears: In addition to his swimming knowledge, Nao is highly perceptive of the people around him.