The kind of couple where bullets figure prominently in the story of their early romance. Where "war buddy" and "significant other" are synonyms. Where if you harm either one, the other will kill you as surely as the sun rises. Likely to have a Back-to-Back Badasses moment.
Battle couples aren't that common, due to restrictions on women in combat. One might expect for the great prevalence of men to mean that gay couples would be overrepresented here, but one would be disappointed in that case; anti-Badass stereotypes of gay men have probably been holding that in check. In heterosexual pairings, the woman will often not be a conventional soldier, but a partisan of some kind. They tend to be more resistant to breakup than most, given the extra bonds forged in combat, but they are particularly vulnerable to losing one half in battle. If the female half of this couple needs to go in disguise, she is a Sweet Polly Oliver. If they have gone all the way expect them to engage in a lot of Glad-to-Be-Alive Sex. It's also possible they may get it on before the fighting
In Real Life, it's also the same as above — and often, they're officers, instead. There are laws in some areas against this sort of thing if one outranks the other to prevent the superior from forcing the under-ranked into it.
If they're married, they're likely Happily Married. Has a platonic counterpart in Adventure Duo. It may overlap with Spy Couple. In fantasy settings, they'll probably manifest as Sword and Sorcerer. Add a kid or two for a Badass Family with a Mama Bear and a Papa Wolf. If it's one guy/girl and his/her harem instead of just two people, then it's a harem hero(ine) and his/her Battle Harem.
See Bash Brothers, Sibling Team, and Fire-Forged Friends for the non-romantic, sibling and platonic forms, respectively. If they're criminals, they're an Outlaw Couple. If they are royalty who do this as one of their jobs they are also a Ruling Couple. If they're villains, they live in Unholy Matrimony. Absolutely no relation whatsoever to this classic board game.
The incestuous Aizel siblings have a similar dynamic; 'Love for himself' does the Leeroy Jenkins style attacking while 'Love for others' pulls power of existence from another location to heal him.
Tsukune Aono and Moka Akashiya from Rosario + Vampire are gradually developing into one of these, as Tsukune starts to develop the powers necessary to fight at or near her level. Fong Fong's parents are one as well, and in a recent chapter Yukari and Fong Fong himself are hinted at becoming one (they haven't officially gotten together, but it's pretty strongly hinted and they've got the teamwork down pat).
Max and Milia/Miriya from Macross / Robotech are probably one of the earliest examples in anime. Their races were at war. Max is a human, and Milia is a Zentradi, but after she defects, the two end up marrying. Milia gets a red variable fighter to match her husband's blue one. They even lead different squadrons together for a time span of about 30 years after the events of the original series.
Kiri and Elraine in Double Arts. They even developed the TitlularDouble Arts fighting style to fight while constantly connected. They are the official couple of their series and will never let go of each other. No matter what. Elraine is afflicted with a special disease that killed a third of the world's population, and the only reason she isn't dead yet is because of Kiri's mysterious ability.
You'd think Sailor Moon and Tuxedo Kamen would be this, being the main characters, but this trope instead goes to Sailor Uranus and Sailor Neptune who arrive together and usually attack in tandem. The former couple rarely fight as a unit.
Generally speaking the setting requires something like this because most mages are squishy and need a physical-fighting warrior to protect them. The manga took pains to show this early on in chapter 17, when any sort of unexpected contact is enough to stop a spellcasting, even if the contact isn't remotely painful. Battle mage-class fighters instead fight alongside their partners instead of behind them. Being able to use both styles equally well and accurately decide which is appropriate for the task at hand is a mark of a high-level mage.
Character-specific examples of this are:
Negi and his partner Asuna; he's the mage and she's his athletic and protective fighter. Interestingly for this trope, Negi decided to train as a Magic Knight so he wouldn't have to rely on and put her in danger as much.
As of chapter 252, Konoka and Setsuna form a Pactio, which means they've become a Battle Couple. They are more of a Lady and Knight pairing instead of the more-or-less platonic Negi and Asuna.
Ling and Lan Fan have a similar leader and bodyguard thing though their romantic involvement is only implied.
We also have the Curtis family. Izumi Curtis, a powerful and impatient alchemist, and her husband, the seven foot tall Sig Curtis. Together, they run a butcher shop and kick so much ass, you could fill the ocean with it...unless they're being lovey-dovey and sometimes even then.
Ghost in the Shell: They would both deny it until the day they die, but the Major and Batou of Public Security Section Nine definitely fall into this trope. Even their voice actors agree that the series is in part, a romantic story.
Erio and Caro from Magical Girl Lyrical Nanoha. While other ships had fought together, they're the two that are rarely seen in battle without the other. They're also a lot more dependent on each other than the other pairs; Caro powers up Erio and serves as the primary transportation, while Erio handles the actual combat. Finally, they're one of the few couple's that's official, rather than just loads of Ship Tease.
Allelujah Haptism and Soma Peries/Marie Parfacy in Gundam 00, after Marie returns to action in the GN Archer, which combines with Allelujah's Arios Gundam to form the Arios Archer. In The Movie, co-pilot Gundam Harute.
You'd thinkRanma and Akane would be one of these, but the truth is, they aren't... or at least, not often and they're not good at it. For starters, Akane's typically a bystander in any battles Ranma gets involved in — if she isn't back at home while Ranma's out in the middle of nowhere beating on whoever's ticked him off, she's sitting on the sidelines and watching while he does all the fighting... or is hypnotized, kidnapped, tied up or turned into a doll and otherwise incapable of joining in. When Akane does join in the fight against an opponent, assuming she and Ranma fight the same foe, Akane and Ranma tend to get in each other's way more than anything (or, at least, Akane herself is overwhelmed and Ranma has to pull her fat out of the fire). Akane, you see, resents the way Ranma assumes "I'm the greater martial artist, so I gotta protect Akane", which typically leaves them wide open to the exploits of their enemies. The one exception in the series, the one time they really pulled the Battle Couple deal off, was during their face-off against the Orochi. There's a reason why Rakaneshippers in particular like to see that story as a Crowning Moment of Awesome and Crowning Moment of Heartwarming. Ranma also fights along side his other fiancees, Shampoo and Ukyo several times throughout the series.
On the other hand, when Ryoga and Ukyo teamed up in order to order to fight the ghosts in the Cave of Lost Love, they worked really well together. The odds were overwhelming but they put up a good fight. The irony here is that Ukyo and Ryoga are not a couple, not interested in becoming a couple, only started working together to fight off the "stray" ghosts that got over-enthusiastic about attacking the real targets (Ranma and Akane), and their doing so just got them deeper into trouble, as seeing their teamwork, and comparing it to Ranma & Akane's bickering, convinced the ghosts that Ranma and Akane were not a couple at all and Ryoga & Ukyo were. Cue Ryoga and Ukyo wailing in despair that they aren't the couple the ghosts are supposed to be breaking up, and afterwards viciously blaming each other for bungling things up.This is made even more hilarious because Ranma and Akane were sorta rooting for Ryoga and Ukyo to become this.
Shinji and Asuka from Neon Genesis Evangelion at their best. The episode "Both of You, Fight Like You Want to Win" sees them undergo syncronization training so they can fight like this against a double angel. It involves a great deal of personal bonding in addition to combat training.
Yuki and Yuno from qualify as this after they finish with the 7th; she's the heavy hitter while he's The Strategist.
Ai and Marco (the couple that comprises the 7th) qualify as this as well. That's their gimmick, after all.
Renais and Soldat J from GaoGaiGar. They may or may not be "official" but they do get a power up when they hold hands and undeniably work as an amazing team.
Girls Love (sorta) example: Noir, with Kirika and Mireille. Chloewanted to have Kirika as her partner and it almost works, but then she attacked Mireille...
Soul Eater: This trope is a common fandom interpretation of the meister-Weapon partnerships. Shipping aside, canon does nothing to dissuade this whatever yourpairing preferences, except for Kirikou and his weapons, which would be problematic. The only truly canon pairing of this nature is Maka's parents; her father was her mother's weapon.
Elfin and Preyas from Bakugan, complete with Belligerent Sexual Tension and Cannot Spit It Out. They constantly argue about which one of them is Marucho's guardian, as well as other things, but when the time to fight comes, they make a great team. Whatever you do, do not, repeat, NOT attack Elfin, or else Preyas will go Ax Crazy on you.
Saya Otonashi and Haji from Blood+ have been fighting chiroptera together for decades, though they don't admit their feelings for one another until the finale.
Kenichi: The Mightiest Disciple has Kenichi and Miu, who, due to having sparred together for a long period of time, naturally fall into this slot whenever they have to fight side by side.
Zero No Tsukaima: Saito and Louise used to be the page image for Sword and Sorcerer. That alone should tell you about how awesome a Battle Couple they are. Similar to the Negima example, Louise summoned Saito to be a warrior/bodyguard for her in battle.
Though we have yet to see them fighting together, Minato Namikaze and Kushina Uzumaki from can be assumed to be this. What we do get to see is how they come up with an awesome and heartbreaking Thanatos Gambit to seal the Kyuubi inside Naruto at the cost of their lives, so they can save Naruto's life and their village..
The first Hokage (Hashirama) and his wife (Mitou) are implied to be this, considering that she was the original jinchuriki of the Kyuubi and Kushina's Old Master.
Umino Iruka's parents. Sadly, they died when Kurama was unleashed.
Ross Sylibus and Naomi Armitage in Armitage III. They are police and their romance is a plot point.
Oscar and Andi from the Pokémon anime are a spoof of the trope. They are efficient as a team-up (and the same goes to their Nidoqueen and Nidoking), but they also are huge Shippers On Deck who claim to be able to spot couples in love a mile away and thus try to hitch Ash with May and Jessie with James.
Cardcaptor Sakura: Sakura and Syaoran Li start out as rivals, but fall in love during the second season. Syaoran decides to stay in Japan so he can help Sakura transform the Clow Cards into Sakura cards. On anoter note, Meiling would like to be this with Syaoran and they work well together but she's an Unlucky Childhood Friend.
Freezing has this as the main premise, with an older female Pandora and a younger male supporter called a Limiter. One of their abilities, the "Ereinbar Set", specifically requires that the Pandora and Limiter have a relationship based on deep, mutual trust. It's not so surprising then that, as Violet mentions, many Pandoras end up marrying their Limiters. As per the trope these couples are particularly vulnerable to losing one half during battle (they fight Eldritch Abominations, after all), and the manga does show the psychological and social effects of losing a partner in combat.
Happens eventually in Dragon Ball Z, when Gohan as Great Saiya-Man is joined by Videl as Great Saiya-Man 2 (called Great Saiya-Woman in the US). Their relationship is reflected in their In the Name of the Moon speeches.
Haseo and Atoli become a Battle Couple in the final volume of .hack//G.U.+, fighting against Cubia together using their Avatars. Ditto for Kuhn and Pi.
Inukami!: Youko would like to be this with Keita, and from the perspective of EVERYONE ELSE they are. From his prespective she's just his demon busting assistant.
Saya's parents, Soichiro and Yuriko, in Highschool of the Dead. They turned their home into a fortress and fight side by side.
A more subdued example: Mio and Shou from Tenyori Mo Hoshi Yori Mo use their powers in tandem in the Grand Finale, but they focus less on fighting evil and more in protecting a whole village from being consumed by fire, an earthquake, and ultimately a tsunami. They succeed, but then they go the Together in Death way.
Makie and Renzaburo evolve into this in Wicked City. As planned by the old man whom they were tasked to protect.
Snake-Eyes and Scarlett from Larry Hama's run on the Marvel G.I. Joe comic. Like the description said, these two mix 'lover' and 'war buddy'.
The original Cap had it too with Sharon Carter and Diamondback.
Thor and Sif, both Norse warrior gods. This comes in handy when Thor is time-sharing Don Blake's body, and is not up to fighting giant robots because he's busy trying to fish Mjolnir-in-stick-form out of the gutter where he accidentally dropped it.
Luke Cage and Jessica Jones. They're (New) Avengers and have a child!
Marvel villains Titania and Absorbing Man were this for a while. They got married.
Apollo and Midnighter, a rare male/male example. That they're unstoppable badasses somehow makes it all the more adorable when they drop the badassery for a cuddle. Also, should you mess with one, expect the last thing you ever see to be the other one dismembering you.
Although DC prefers non-costumed spouses/significant others, there are a few qualifiers: Green Arrow and Black Canary, Liberty Belle and Hourman, Blue Beetle (Jaime Reyes) and Traci 13, the Kryptonian Nightwing and Flamebird.
The original incarnations of Hawkman and Hawkgirl were a textbook Battle Couple.
Villain example: Cannon and Sabre were assassins working for opposing gangs who decided to kill each other's bosses and merge the two organisation into one with themselves on top. When that panned out, they bought a beach house together and went freelance.
The New Gods Mr. Miracle and Big Barda are another DCU example.
Sonic and Sally; the cartoon adaption's opening theme shows them blowing up a robotknik pass together. She's in his arms by the end of it.
Adeline and Slade (Deathstroke) Wilson, in New Teen Titans, till his double life got their son kidnapped and rendered mute, then she shot out his eye (she was trying to kill him, but enhanced reflexes saved his life, if not his eye).
At the end of Watchmen Silk Spectre II and Nite Owl II have married, and from their conversation it's clear they plan to work together as illegal masked vigilantes.
Ball and Chain features Edgar and Mallory Bulson, alias Thunderball and Chain Lightning. Their powers are dependent upon their physical contact and proximity, which is inconvenient since their relationship was over when they got them. Still, they get it together in the end - because they'll always be there for each other.
101 Dalmatians: Pongo teams up with Perdy to lay the hurting on the two thugs who plan to kill not only their puppies but the other 84 parentless puppies as well. Their treatment of the bad guys is SCARY. You do not mess with puppies and let their parents find out. It is clear these dogs will go through hell and back to save their puppies; all 15 of them.
The Rescuers: Bernard and Bianca make a living of beating down bad guys. He was about to propose to her in Down Under before another adventure interrupted him.
In Kung Fu Hustle, there is the battle couple of the Landlord and Landlady. Both appear as innocuous, though important characters that later in the film demonstrate incredible martial arts skill.
Katniss and Peeta work together in The Hunger Games except he doesn't know she's only pretending to love him in order to gain sympathy from sponsors.
Calamity Jane: Considering how Calamity Jane and Bill Hitcock are skilled gunslingers and like trouble, you'd think they'd turn out to be this couple in an instant, but it's implied to be averted after they get together as both of them want to settle down and raise children. They've been close friends for quite some time, so it's not outlandish to assume that they played this straight at some point.
Bill's Friend: I don't know what kinda life you're gonna have living with that catamount, Bill, but it ain't gonna be dull!
Bill: That's fer dang sure.
Spock and Uhura in Star Trek Into Darkness as they accompany Kirk to a war-torn world in order to track down John Harrison.
In Black Dagger Brotherhood novels, this trope is inverted with Xhex and John, as fighting together causes major problems in their relationship. Though he knows that she's a capable warrior, bonded males are genetically hardwired to protect their mates at any cost, so his instincts keep firing up on the battlefield and putting them both in danger. This pisses her off as she thinks he doesn't respect her skills; they separate for a good long while because of it.
Ruggiero and Bradamante from Orlando Furioso. When they're reunited halfway through the work, the first thing Bradamante does is go off to save a dude, and Ruggiero is thrilled to have a woman understand what he does.
Slippery Jim diGriz (The Stainless Steel Rat) and Angelina, his wife and fellow criminal genius. He's a criminal mastermind who dislikes killing. She's a formerly-psychotic criminal mastermind who bemoans the fact that she can't casually kill people now she's had a conscience implanted. They Fight Crimewith crime.
The mixed-gender Valhallan 597th features several couples. These include Cain's own apparent liaison with Inquisitor Amberley Vail, as well as Sergeant Vorhees and a female trooper named Dedre in Caves of Ice, and a strongly implied lesbian relationship between Sergeant Grifen and trooper Mari Magot in the same book.
Cain invokes this trope; relationships in the guard normally aren;t allowed but Cain allows it because it improves morale and makes them fight harder.
Colonel Kasteen and Major Broklaw, the commander and Number Two of the 597th respectively. Nothing romantic is ever confirmed in-story, but Broklaw refers to Kasteen by her given name, implying they're on First Name Basis — which is highly unusual for a relationship that's merely commander-subordinate.
Amelia Peabody and her husband Radcliffe Emerson, Egyptologists and incidental detectives in the Amelia Peabody mysteries by Elizabeth Peters. The stories are set stretching from the Victorian era into the Roaring Twenties. Peabody and Emerson are grandparents, now, but that only slows them down a little. They have produced a second generation Battle Couple, their son Walter "Ramses" Emerson and his wife Nefret. The third generation is alarmingly precocious and will almost certainly turn out to be Meddling Kids.
Koryk and Smiles in Malazan Book Of The Fallen occasionally act like this. The fact that they flirt while killing people is disconcerting.
Aral Vorkosigan and Cordelia Naismith meet in this fashion. They take out the mutineers on Vorkosigan's crew (twice).
Admiral Naismith/Miles Vorkosigan and Elli Quinn are a straighter example of this. She dual hats as his intelligence chief and executive officer when he leads the Dendarii Free Mercenary Fleet. The relationship ends when Miles is forced to retire to civilian life.
Carrot and Angua, both police, in the City Watch novels in addition to Sybil and Vimes; The Captain of the City Watch and his Lady of War wife.
In general the Star Wars EU is full of these with the majority of the main couples being battle couples.
Wedge and Iella, Corran and Mirax, Kell and Tyria, Face and Dia, Gavin and Asyr Myn and Lara... it should go without saying that the X-Wing series of the Star WarsEU, being about fighter pilots, has a lot of these.
Han and Leia are mentioned under film already, but their battle couple status continues in the expanded universe.
Ben and Vestara; He's a jedi and she's a Sith apprentice.It doesn't work out. One interesting example due to their main allegiance being to the order is Obi-Wan and Siri in that they both realize that they would rather be Jedi than in love.
Every time Heralds and/or Hawkbrothers get together in the Heralds Of Valdemar series: Talia and Dirk, Elspeth and Darkwind, Kerowyn and Eldan .... A specific exception is Alberich and Myste; Alberich is the series' resident Empowered Badass Normal while the Author Avatar Myste, Herald or no, is a bookish librarian.
The Wheel of Time: The main plot of the series involves everyone preparing for The Last Battle, so every named couple falling in this trope. A few examples are Rand and Min/Aviendha/Elayne, Lan and Nynaeve, Egwene and Gawyn, Perrin and Faile, Siuan and Gareth, a few Aes Sedai and their Warders, a few Asha'man and their Warder-like Aes Sedai, and countless Aiel couples.
Ron and Hermione can fight together when they aren't arguing.
Harry and Ginny fit on the occasion they fight together against their enemies. At the end of book six Harry tied to defy this trope by saying It's Not You, It's My Enemies but she wasn't having any of that.
Since everyone joins in on the last battle in Deathly Hallows, Lupin and Tonks, Mrs. Weasley and Mr. Weasley, and Fleur and Bill also count.
Likely the Potters and the Longbottoms were Battle Couples during the first incarnation of the Order Of The Phoenix.
As shown on the covers of The Alien Series, Kitty and Martini believe that the couple who kicks ass together stay together.
The Amazon Legion invokes this intentionally with the Tercio Gorgidas, a tercio (roughly equivalent of a regiment) comprised of homosexual male pairs who are married in a special ceremony, with an explicit nod given to the Sacred Band of Thebes (see the Real Life section).
Bellisarius and Antoninia in Belisarius Series (and in Real Life, by the way) although they are usually in different theaters. Also Rao and Shakuntala. The Theodoran Cohort has a number of Battle Couples.
Richard and Kahlan are this and become more so after Richard taught her his methods of fighting. Zedd, Cara, and Nicci all take turns being the third wheel.
The Mord-Sith are this with the Lord Rahl. All of them. It's like a harem of dominatrix, Anti-Magic, Break the Cutie, magical-taser wielding Aryan bodyguards in various colors of leather!
Tales of Kolmar has a bunch. Jamie was Maran's bodyguard, though she became a good fighter herself. Much later Jamie and Maran's friend Rella become this while trying to protect Lanen and Varien. Lanen lacks the necessary speed and will to be a career fighter but has to try her best anyway; Varien is new to being human and doesn't know what he's doing with a sword, but he's unnaturally strong and very protective.
Delenn, while in command of four very nasty warships: Only one human captain has ever survived battle with a Minbari fleet. He is behind me. You are in front of me. If you value your lives, be somewhere else!!
Buffy and Angel; all their time spent fighting evil together. However consumating the 'couple' part led to the release of Angel's Superpowered Evil Side which was a stickler in their future relationship.
Buffy and Riley and unfortunately this is one of the factors leading to their break-up, as Riley's lack of superpowers meant he can't keep up with Buffy in a fight.
Charmed: The woman, Piper, who is the more aggressive one, and the man, Leo, is the more peaceful one. When it comes to the safety of their children, the opposition tends to explode spectacularly.
Chuck: Chuck and Sarah become this late in the third season. Especially evident in "Chuck vs. the Honeymooners", when their fighting (while cuffed together) looks a much like a dance as a fight, and in "Chuck vs. the First Fight", where they fight bad guys while fighting with each other.
CSI NY: Danny and Lindsay, since they both spend a lot of time fighting bad guys and there have been a lot of flying bullets in their romance.
Dexter: Dexter and Lumen become this in Season 5. Notable in that instead of battle, they're both serial killers.
The Doctor and River Song; he is a Memetic Badass both in-universe and out, and she is a part-Time Lord genetically bred child created as a weapon to fight the Doctor. She fell in love with him instead. They've fought off alien invaders back-to-back, while flirting and their names strike fear in villains everywhere. River once made a Dalek beg for mercy! They're married!
In the serial "Battlefield", Ancelyn and Brigadier Bambera start out beating on each other and end up as a glorious example of this trope.
Madam Vastra and Jenny Flint; sword-wielding interspecies lesbian detectives who fight crime in Victorian London (and sometimes other eras). The 2012 Christmas special confirms that they're not just together, they're married.
Dollhouse: Paul and Echo successfully watch each others' backs through ten years and an apocalypse.
Farscape: John Crichton and Aeryn Sun. A slight variant, as he starts off being mostly useless in combat (he was a scientist before he was shot across the universe), but by the end he's not only protecting her as much as she protects him she finds his insane "plans" and constant, nigh-incomprehensible-to-aliens pop culture references charming and fun. Perhaps best shown at the start of the Peacekeeper Wars. They are reformed after two months Not Quite Dead in the same passionate kiss they were in before. They pull apart, stare tenderly into each others eyes, and at the exact same moment pull out their weapons and have the whole room covered. It's awesome.
Wash and Zoe have faced a great deal of danger together. Interestingly, Zoe is the warrior of the couple. Her husband Wash is an Ace Pilot. He might fool viewers at first, but he's pretty badass and shows off in "War Stories".
Downplayed in Zoe and Mal. Despite fighting through the war and facing life and death together, there is no romance between them, as we see in "War Stories". They are close and tight friends, but definitely not a romantic couple.
Generation Kill: Subverted Trope. One of the Marines receives a letter from his My Girl Back Home. She announces that she has enlisted in the Marine Corps to be able to fight alongside him. He is annoyed by this because, not only is she ineligible to join Marine Recon with him, she could potentially be deployed somewhere away from his own duty station.
Hart To Hart: Yet another battle/spy couple are Jonathan and Jennifer Hart.
Kamen Rider Dragon Knight: Features Len and Kase, who are separated for the first half of the show due to her being MIA from a previous battle that didn't go well. Unlike the general version of the trope, they're both superheroes that fight physically; "magic" is only used to boost the power of their normal attacks.
LOST: Kate and Sawyer used to a formidable tagteam regardless of their relationship status at the moment. Kate also occasionally had this with Sayid.
Once Upon a Time: Prince Charming and Snow White. He is a badass with a broadsword and she doesn't seem all that unfamiliar with weapons either. When the Queen shows up at the wedding she unhesitatingly drew Charming's sword.
Revolution: Episodes 13 and 16 show Charlie Matheson and Jason Neville becoming this.
Robin Hood: From the BBC's show: not so much Robin and Marian (they are rarely seen fighting together), but outlaws Will Scarlett and Djaq. Their first act as an official couple is to kill a man, after which Will informs the corpse: "She's with me."
Sharpe: Richard Sharpe and Teresa Moreno from the novels and TV series are the archetype. They met fighting in Spain. They fell in love, married and had a daughter (not necessarily in that order). In between these episodes, they fought against Napoleon's armies in Spain.
Spartacus and Sura kick ass together in the first episodes, and when Spartacus dreams about her or thinks up his escape plans they are always fighting together.
Later Spartacus and Mira; Mira is not a gladiator but she's ferocious with a knife, and they fight together multiple times.
Crixus and Naevia count as well; at first was Damsel in Distress, but then Crixus taught her how to properly chop off heads, and now they happily slay Romans together.
Agron and Nasir fought together before they became a couple, and now that they are together they continue to kick Roman ass.
From the prequel we have Barca and Auctus, who trained and fought together for many years.
Stargate SG-1: Rya'c and Kar'yn become this in the episode "Sacrifices". This trope is lampshaded and used to justify their marriage when they face opposition from Teal'c on the basis that Rya'c has chosen to fight the Goa'uld and that war has to be his priority. As Ishta points out, "A warrior is always stronger with another at his side" so being a Battle Couple will be better for both them and their cause.
All Klingon relationships. Klingons adore Battle Couples and they are Older than Dirt in their culture. Not only is there the legendary pair Kahless and Lukara but stories of Battle Couples go back from the legendary to the mythic when the first Klingon Battle Couple sacked the heavens together. In every Klingon marriage an important part is promising to be a Battle Couple. Worf and Jadzia Dax tended to have their most dramatic moments exemplifying this trope.
Almost all Bajoran relationships fall along similar lines to the klingons.
Quark started a battle couple relationship by successfully courting a Klingon Noblewoman.
In any table top game, there can be this with characters who are a couple.
Ah, the sweet romance that is Vlad and Isabella von Carstein in Warhammer... Either of them goes nuts if the other's killed. Admittedly, Vlad's a significantly better fighter than Isabella (that's not to say she's useless, but he's a Vampire Lord...).
Weapons Of The Gods, the wuxia RPG based on the comic of the same name, has several sections on this trope as exemplified in Shen Zhou, both on setting lore and mechanical impacts of the relationship. The example couple given for the section "Husband and Wife" is Sun and Yin, who keep arguing about Sun's oath of compassion and Yin's reluctance to honor that oath as Sun's wife while surrounded by and fighting an enemy army all by themselves.
Exalted has this as part of the mechanics; specifically, all Solars and Lunars are matched up in three hundred pairs called Bonds. The Bond is not necessarily romantic, it can just as easily be platonic; in fact, most examples of it are. None the less, the possibility is there - for one, the Exalted setting has very little prejudice against homosexual pairings, and for the other, Lunars are consummate shapeshifters.
Gordon Freeman and Alyx Vance from the video game Half-Life 2. While the exact nature of their relationship isn't clear (Gordon never speaking makes things difficult), whatever it was, it was forged in the fires of battle.
Raider and Raven. It doesn't make for any huge change as gameplay is concerned (they merely share moral gains.), but they do have their own Informal Eulogies for each other if one should get killed in battle.
There's also Wolf and Fox — she's the reason he lost all that weight.
In Metal Gear Solid 4: Guns of the PatriotsJohnny eventually wins Meryl's heart, by saving her life on not one but three occasions. In this scene, they hold a door against endless waves of attackers while slipping new magazines into each others guns, and proposing each other for marriage.
In the third game Snake Eater, The Boss and The Sorrow had such a relationship before suffering a fate much worse than Star-Crossed Lovers, namely being forced to fight each other in order to uphold loyalty to their respective nations, namely the US and the USSR. Said fight ended in The Sorrow's death. However, before being forced to split, The Boss gave birth to The Sorrow's son (Revolver Ocelot) while participating in the D-Day invasion. In what may be considered either the most heartbreaking or heartwarming conclusion to that relationship, the Sorrow encouraged the Boss to kill him to complete her mission. This strongly implies that the Sorrow wasn't willing to fight to defend himself against her, showing that his loyalty was first and foremost to her.
Pick a Fire Emblem couple. For characters to develop a relationship, the gameplay requires them to stand close on the battlefield a certain amount of time. You get bonuses added to their stats when they do this. With Min-maxed supports (for example 2 earth alignments for hax evade) the units in question are able to take on half the battle by themselves. The Power of Love (or friendship), is indeed a mighty force.
The most obvious examples, both story- and gameplay-wise, might be Louise and Pent from FE7 (a Happily Married couple who start out with an automatic, unbreakable A-rank support) and Micaiah and Sothe from FE10 (who, once again, start out with an automatic A-rank support and will marry at the end if the player doesn't break up their support).
Brought to new highs in Fire Emblem: Awakening. Now two characters can go together (as in, sharing the same spot), which gives the active partner a boost in stats and allows their Relationship Values to develop faster. All male/female team-ups (except siblings and parent/children) can potentially end up in marriage.
This is half the point of the Ar tonelico games. Inevitably the main character (who is a melee fighter) is paired with a backline magic-using woman. When blocking attacks against her, he stands very, very close. When she is casting spells, their power is increase by her love for him. In the second game, the combat dialog is full of innuendo.
Sonic and Amy zigzag this trope depending on the game.
Sonic Advance 3 is a parody becaue they are referred to as a "Lovely Couple" even though Sonic doesn't look too happy about it, while Amy wishes they were.
Downplayed in Sonic Rush where Sonic and Blaze fight against Eggman and Eggman Nega. Despite the occasional Ship Tease, it's up for interpretation whether there is anything between the two.
The Cool Couple double battle trainers in the Pokemon Ruby And Sapphire games, and the Double Team trainers, the Generation IV version of the Cool Couple (a pair of Cooltrainers or Ace Trainers, respectively). They make it in the anime as Oscar and Andi. See Anime.
Baldur's Gate series has a few. There's Khalid and Jaheira, and to a lesser extent, Eldoth and Skie, in the first game. In the second game, the player him-/herself could have one, with one of the several options, while Haer'Dalis and Aerie, and maybe Korgan and Mazzy, have potential for this as well (but in an unmodded game go nowhere).
The possibilities for this in the Knights of the Old Republic games are endless... In the first game, Revan and Bastila (especially awesome if you decide to join Bastila on the Dark Side, or alternatively heartwarming if you can use The Power of Love to return her to the light side) if you play male. Carth or even Juhani if you play female. You get a choice in the second- The Exile and Atton or the Disciple if the Exile's female, and Visas or the Handmaiden if he's Male.
As above in Neverwinter Nights: Hordes of the Underdark, with the ghost of Aribeth or Nathyrra and your PC, who end up beating up Mephistopheles Or Valen and the PC if the PC is female
Neverwinter Nights 2 (Though it was made by Obsidian) kind of precludes this with three of the four love interests over the course of the official campaign/Mask of the Betrayer arc being spellcasters (and Safiya being a literal Squishy Wizard), but a female PC and Casavir qualify. A male PC and Elanee, if she is optimized for combat; or a female PC and Gann if he is optimized for combat both fit.
The "Lair of the Shadow Broker" DLC can be played as Shepard and Liara getting back together - which, for them, involves tracking down and killing one of the most feared men in the galaxy. It makes the squabbling in the Taxi Chase Scene all the more funny when the implications of a relationship gone awry are thrown in.
Any romance option in Dragon Age: Origins. Becoming a couple will help the characters level up.
Especially long-lasting example is Leliana: in the Awakening epilogue (only if you romanced her and survived until then, of course), it is mentioned that the Warden is still out there adventuring together with her, years after the events of the game.
Seeing as in the game's world any participant in the Reapers' Game needs a partner or they're powerless, it can be assumed that there have been quite a few Battle Couples out there.
One other case stands out in particular: Uzuki Yashiro and Koki Kariya. This Reaper duo fights you twice in the game and even have their own version of a light puck as well as a team attack that can render players that are under-leveled at those points in the game, screwed. Their relationship can also be considered Vitriolic if not an outright Battle Couple.
There's Neku and Shiki, who are treated as the star couple in all but name. Sure, they had a rocky start, but by the end of their chapter they've become an unofficial Battle Couple, such that their separation is a major tearjerker for either of them, while their reunion at the end of the game is all the more heartwarming.
This appears to be the norm with most couples in Resident Evil, even if the pair aren't romantically linked. If they are, expect bad things to happen by the end.
On a similar note (with Female Character x AFGNCAAP forming this) there's Edge and Blaze in Ace Combat 5.
There's also the two-person Espada Squadron in Ace Combat Zero, whose Number Two heavily implies that she was in a long-time relationship with Espada 1 at the time of their fateful encounter with the Galm Team.
Even earlier, Ace Combat 04 gave us Yellow 13 and Yellow 4, the only permanent members of their squadron. However, in their case, the romantic feelings were probably one-sided, since 13 seemed to have only seen a valued student and a trusted wingwoman in 4.
Just about every couple in the Super Robot Wars Series is this. But especially the ones that have a combo attack.
City of Heroes: Fusionette and Faultline. She's a mutant with a nuclear reactor for a heart, and he's the son of the guy who wrecked Overbrook. It turns out the guy was Brainwashed and Crazy. You run into them repeatedly in the Rikti War Zone with them kicking butt all the way.
Manticore and Sister Psyche, teammates in the Freedom Phalanx who eventually got married...and had to fight off a horde of PC villains at their wedding.
The various installments of Dynasty Warriors gives us Lu Bu and Diao Chan, Cao Pi and Zhen Ji, Meng Huo and Zhu Rong, Sun Ce and Da Qiao, Zhou Yu and Xiao Qiao, Liu Bei and Sun Shang Xiang, and Zhuge Liang and Yue Ying.
Dynasty Warriors Strikeforce has several missions based entirely around fighting said Battle Couples.
If you get the best ending in Cave Story, it becomes clear that there's a bond between Quote and Curly Brace. It's not clear if it's platonic or romantic, but either way, it's strong as iron.
This trope is the concept behind the Sakura Wars series. The games are strategy-RPGs where the stronger the bond between you and your teammates is, the better all perform in battle.
Atelier Iris Eternal Mana has Klein Kiesling and Lita Blanchimont as the Galgazit partners with an inversion of the usual hero and heroine state as Lita is a tank while Klein is a magician/healer.
Lololo and Lalala from the Kirby series. Justified in the anime adaptation, as they're two halves of the same being.
Golden Sun: Issac and Jenna though they married after the period they fought together. Considering how long it took for their kid to pop out, they probably did not spit it out until some time after the first series ended.
Shing and Kohak from Tales Of Hearts definitely qualify. This also counts as a rare example where the woman in the duo is arguably the moreBadass of the two.
A strange Foe Yay example: Alvin and Presa are hinted at to have been this, or were on the verge of becoming so, in Tales Of Xillia, but their relationship descended into a love/hate one by the time of the game. Jude and Milla, however, are confirmed to have developed into one by the game's ending although, sadly, they can't stay together and she has to go for an Always With You option.
Final Fantasy XIII-2 is an aversion. While Serah and Noel fight together and grow close over their adventure they do not become a couple. They have other love interests in Snow and Yeul so one can say they are a Battle Platonic Partnership.
Gladius has a cup where you deploy 1 male (the only time a male unit must be deployed for their maleness) and 1 female unit and claims to be based on this. Nothing stops you from deploying the twins Ursula and Urlan beyond not complimenting each other (both being medium class units), presumably because its made by Lucasarts.
The Legend of Zelda: Link and Zelda have skirted this trope ever since Ocarina of Time where Zelda assisted Link's final battle against Ganon with combat advice and a stunning spell. In Wind Waker she becomes an active participant by firing light arrows. In The Legend of Zelda: Spirit Tracks, Zelda can possess monsters. Link being a Heroic Mime, it's hard to pin down a relationship and the Spirit Tracks example is closer to Puppy Love.
Rune Factory 3 allows you to pick up a partner and go into battles. If your partner is your love interest or wife, it's this trope. Sonja and Aden from Rune Factory Oceans may or may not count, since they share the same body for a large amount of gameplay.
In The Elder Scrolls V Skyrim you can be part of one yourself. This is because you are able to recruit an NPC to fight with you and ask them if they want to marry you. Do both and you play this trope straight.
Dart Feld and Shanna of The Legend of Dragoon are adventurers that can transform into Dragon knights. They become this trope after Shanna admits her feelings at the end of disk two.
In Persona 3 and Persona 4, you can get a girl or boyfriend with characters of the opposite sex, including your battle partners, which would fit the trope. The only exception is Junpei in P3P, due to Chidori stealing his affections.
Nate and Elena, the Official Couple of the Uncharted series, get together while fighting off an army of Mooks and hunting for El Dorato on an uncharted island, which pretty much set the tone for their whole relationship. Uncharted 2: Among Thieves briefly has Nate and Chloe, during one of his frequent break-ups with Elena.
StarCraft II continues the story. After despairing for years on his guilt about what happened to Kerrigan, Raynor finally succeeds to de-infest her and bring her back to her original personnality... only for her to turn herself back into a Zerg willingly so she can go on a Roaring Rampage of Revenge against Mensgk. While she retains control this time, and even saves him, he is understandably horrified by what she has done and put an end to their relationship. Eventually he realizes Kerrigan is no longer the blood-thristy monster she was as the original Queen of Blade, and comes to save her in the final confrontation with Mensgk. By the end of the game, they are on good terms again, and while they cannot stay together due to consequence, they clearly still love each others.
Fate/stay night: Pictured above are Saber and Shirou. They are a Master and Sevant fighting in the Holy Grail War. A Bittersweet Ending ensues where they can't be together because Saber is being called back to her time. You can imagine the outrage that resulted from this ending.
Rin and Shirou as well, during the Unlimited Blade Works path. Saber backs them up as often as they go it alone and considering Rin's preferences...perhaps a rare example of a Battle OT 3?
Caster and her Master Souchirou Kuzuki form a villainous version of this. She does the high speed spellcasting, her Master handles close-range physical combat and shields her.
Fans! gives us Will and Shanna, and (in the Badass Threesome category), Rikk, Rumy and Ally.
Rikk: I've spent the last five years with two remarkable women. One of them is one of the toughest, cleverest fighters I've ever seen anywhere. The other is Rumiko Tanaka Oberf!
Although we're not sure if they're an 'official' official couple Gil and Agatha of Girl Genius definitely make this work during the slaver wasps' invasion of the Castle Wulfenbach. Later, Given events in Castle Heterodyne, we have a battle threesome. Agatha cares deeply for both Gil and Tarvek.
Elan's Evil Twin Nale also forms one with Sabine, a combat Succubus. They once had a lover's quarrel during an Evil Plan because Nale feared that Sabine had a crush on Elan. She reassures him and they go back to committing evil together.
Leo/Jason and Tigris/Kira from Panthera. They met by being the first two students to become elemental-powered panthers designed to fight a secret government project. They've had spats since Jason brought his little sister into the club, though.
Torg and Zoe from Sluggy Freelance have a Battle Couple moment in this strip. True, they're not actually a couple, but Torg's crush on Zoe does develop not long after this storyline.
DC Nation is fond of this trope, and sometimes dovetails it with Badass Family. Sand and Merlynne (and, previously, Merlynne and Caleb); Green Shield and Green Lantern Travis Grey; Changeling/Beastboy and Fauna...
Church and Tex; it's clear they both still feelings for each other no matter how many insults they toss back and forth. Probably more feelings from Church than Tex as her emotions seems to have taken a beating during her time as a Freelancer paired with a psychotic Ax Crazy AI. Later seasons reveal it's more a case of her emotions taking a beating during her time as an AI paired with a psychotic Ax Crazy AI. Just to be pedantic.
Season 10 gives us a straighter example in the Insurrectionist Leader and CT, who give Tex and Carolina a good fight (even though CT was mortally wounded by Tex).
Whateley Universe examples: the superheroes the Mystic Six were three Battle Couples, until Cirque died. The other two couples are still together, although nominally retired. Then there's Pendragon and Gloriana, the leaders of the Future Superheroes of America at the school.
Averted with Aang and Katara; although they become a couple at the very end of the last episode of Season 3 they don't normally fight together. Oddly enough, Katara has more team-ups with Zuko than Aang, who more often then not, fought alone.
Sokka and Suki have this as Character Development. When they first met, neither took the other seriously as a warrior; him because she was a girl and her because he lacked training. On their second meeting, Sokka was super overprotective of her because of what happened to Yue. On their third meeting, both of them have mature enough to fight as equals, and have shared several kisses.
In The Legend of Korra, Korra and Mako become this by the end of season one, with 'Endgame' showing off this trope beautifully in tagteam against Amon. Although the battle comes just before the couple, the feelings were already on the table.
Miss Martian and Lagoon Boy take water based missions together. The latter enjoys all this time alone with his 'angelfish'. Miss Martian's previous boyfriend, Superboy, was pissed off by her brutal battle tactics and broke off their relationship.
Kid Flash and Artemis are aversion; by the time they hooked up they became Retired Badasses. Then they treat a save-the-world mission in Paris like a date.
The parents in Dave The Barbarian are this. Their choosing to be a Battle Couple sets up the premise of the series. They went off on a world tour to smite evil and left their daughter, Candance in charge of the kingdom.
During its hegemony in the 4th century BC, the Greek city-state of Thebes had an elite unit called the Sacred Band consisting of 150 soldiers, each paired with his adolescent gay lover. After the battle in which he defeated them, Philip II of Macedon raised a monument in their honour and admonished "no one to speak ill of these heroes".
The US Army tries to keep heterosexual soldiers who are married to one another in the same unit (or at least the same post) and lets them share a room if they are deployed together.
Italian strategist Guiseppe Garibaldi and his wife Anita Garibaldi: fought in three wars and had four kids together.
Isabella I of Castile and Ferdinand II of Aragon. Married at 17 despite the opposition of Isabella's brother and king, then went on to win a civil war, finish the Reconquista, discover the Americas and secure Spanish dominance over Italy and the western Mediterranean. They also committed a couple of genocides; nobody's perfect.
In his book The Greatest Battle (on the Battle for Moscow in World War II) Andrew Nagorski interviewed two former members of an NKVD special forces unit who were ordered to go Undercover As Lovers (in the belief that a married couple would draw less attention) who, despite their initial awkwardness, ended up getting married for real.
George VI and Queen Elizabeth in World War II. When someone suggested that the princesses should be evacuated to Canada, the Queen said: "The children won't go without me. I won't leave the King. And the King will never leave."
William Hays and his wife Mary Ludwig, also known as "Molly Pitcher", who took her husband's place at a gun when he fell.
While the eighteenth century military was male-dominated this was an unofficial institution of eighteenth century armed forces. Camp followers, while they did include prostitutes, also included the wives of servicemen (in the Royal Navy prostitutes were more likely in port; after all their profession didn't pay enough to go to sea to practice it). Officially they were disliked by officers but they would often look the other way and service wives could provide useful services. In the British Army it was customary to cast lots for which of the soldier's wives would go with their husbands on campaign. In the Royal Navy when the chief came through to wake up sailors he would shout, "show a leg". If it was hairy the chief would roust the leg's possessor out of bed, and if it wasn't the leg's owner was assumed to be female.
Robert Guiscard, Norman king of Sicily and his wife, Sichelgaita, the Lombard queen of Apulia. They won against the Byzantine army of Alexios Komnenos in Durrazzo 1081, commanding the Norman army together. At one time the Normans were repulsed and about to rout. Sichelgaita rode ahead the army, undressing herself and yelling naked: "Are you men or maidens? Follow me!" Anna Komnena, the Byzantine historian, compared Sichelgaita "like the Amazons of the old".
Same sex relations weren't accepted in Japan of old unless they were this trope and they still had to be discreet about it.
A common downplayed version was when the women were expected to Minor In Asskicking while the men were on campaign. This was known in Japan where samurai women trained to protect their homes, their honor and their exclusivity with the Naginata (sort of like a halberd). In Europe, noblewoman were sometimes in charge of castles and acted as chief of staff during a campaign; though that is closer to Ruling Couple it had military aspects. Viking women regularly owned saxes, which were both a peaceful and warlike tool. As American folklore remembers, frontierswomen could, in a pinch, handle a rifle if their cabin was attacked.
When a city was under attack, historically, it was common for everyone to fight. Yes that means absolutelyeverybody. Married couples fighting together in some capacity was a common sight. One reason sieges were so disliked was for that reason.