Crossovers
- BlazBlue Alternative: Remnant: Yang and Pyrrha after they start dating form one in the Vytal Tournament, where they tag team against Bolin during their match against Team ABRN.
- The Bridge (MLP) gives us, after a half dozen Relationship Upgrade moments to go from enemies to friends to Official Couple, Aria Blaze and Monster X when they have the final confrontation with Enjin. Bonus points for the story's first Official Kiss happening right after they won.
- Child of the Storm has several examples:
- Sif and Loki, after the finally get together at the end of the first book, though they don't always fight side by side, given that she's the Goddess of War (especially close-quarters-combat) and Loki's skills tend more towards skulduggery and command-and-control level sorcery.
- Uhtred and Jean-Paul become this once they get together, despite Jean-Paul's distaste for fighting - all it means is that he prefers not to fight, and that when it comes to it, he will end the fight quickly. Which, in an imaginative and exceptionally powerful speedster with more pragmatism than scruples can get messy.
- Harry and Carol function as this even though they're an Anchored Ship for much of the end of the first book and the second book, up to and including a ridiculous amount of Flirting Under Fire while fighting anything and everything from superpowered Renegade Russians to Vampire Monarchs and Eldritch Abominations. Ironically, at the time of writing, they haven't fought together since they got together.
- Children of an Elder God: Shinji and Asuka got together during the story. They fight Eldritch Abominations of the Cthulhu Mythos using their super robots... or power stolen from other eldritch abominations they killed previously.
- Crossover Chaos has quite a few examples. Killer and Beetle become this after they get paired up in v1, as well as Kyle and Lindsay once they join C.H.A.O.S early in Agents of C.H.A.O.S.
- Dungeon Keeper Ami has Action Girlfriend Cathy and Lovable Rogue Jered. They've been together since their first appearance, have been fighting together as mercenaries before coming across Keeper Mercury, and kept fighting together after being hired by her as well.
- Zoisite and Kunzite count as well, being fighting generals of the Dark Kingdom and being in a questionable relationship.
- The Echo Ranger: Izuku and Melissa start dating shortly before he gets into the UA, and after she manages to create a second Echo Power Coin for herself, she becomes his teammate as a Power Ranger. They get to have their first battle together against the Shadow of Psycho Pink during the attack on the Kashyyyk Mall.
- Fate/Stay Night: Ultimate Master: Ben and Avenger, while not romantically involved, fit this trope in every other aspect: they are of opposite gender, they both kick ass of their own pretty well (to illustrate: Ben is an Alien Shapeshifter Super Hero, Avenger is a magically summoned and enhanced Jeanne d'Archétype), and they are both very protective of each other. Also, they do get some Ship Tease.
- Last Child of Krypton: Shinji and Asuka. He is Superman. She is Wonder Woman. And their enemies are screwed.
- The Many Dates of Danny Fenton: During the times both Danny and the girl he goes out with discover each other's identity, they will team up to take down whatever villain who appears to spoil their date.
- Samus Aran and Mitsuzane Kureshima in Metroid: Kamen Rider Generations
- Intergalactic bounty hunter and Armored/New Generation Rider. - Shadows over Meridian: Windblade and her mate Metalbeak are the joint leaders of the Mogriffs, and fight side-by-side to repel the rebel siege on Snowpoint.
- Superwomen of Eva 2: Lone Heir of Krypton: Shinji and Asuka till Asuka got taken out of the roster of active pilots. Until that moment they had fought many battles together against Eldritch Abominations.
- In Tales of the Otherverse, super-heroines Supergirl (Kryptonian) and Rogue (power-leeching Flying Brick) get together and found their own super-hero team.
- Voyages of the Wild Sea Horse:
- Ranma Saotome, Nabiki Tendo, Kodachi Kuno, Shampoo and Ukyo Kuonji end up forming a Battle Polycule of Supernatural Martial Arts-practitioners, with two of them also being Zoan Devil Fruit Users.
- Harumi Tsukuyomi and Miriam Ransdottir are a Pretty Boy swordsmaster and a three-meter-tall shark-girl who kick all kinds of ass and who absolutely swoon over each other.
- Thousand Shinji: Shinji and Asuka began to strongly bond when Shinji told Asuka that they should fight together to destroy their enemies. From that point they became partners-in-battle and shortly after they got together. The results were bloody for their enemies.
- In Wonderful (Mazinja), Gallant and Glory Girl are a couple and members of the same super-heroic team. He's an empath and she a Flying Brick.
- Ben and Looma form one during her visit during Four Armed Bride. They work well together and Looma's call with her father Gar makes it clear this is a major part of a successful Tetramand relationship.
- In the Facing the Future Series, Danny and Sam have become this following Sam gaining ghost powers.
- In the Supergirl fanfic Hellsister Trilogy, Legion of Super-Heroes members Kara Zor-El and Dev-Em get together during the story as fighting the minions of Mordru and Darkseid.
- Here There Be Monsters:
- Mary Marvel and Captain Marvel, Jr. have been together for so long as they have been crime-fighting.
- Before their retirement, Amantep -a.k.a. Ibis the Invincible, an ancient Egyptian wizard- and his wife Taia used to fight supernatural threats together.
- In the Arrow sequel fic Legacy: When Roy and Thea suited up as the Arrow and Canary 2.0, witnesses said watching them fight was "like watching the principal dancers of the Moscow ballet.
- In Superman of 2499: The Great Confrontation, Alan and Kath were already a couple, and they became a crime-fighting team once Kath claimed the Supergirl legacy.
- With this Ring... (Green Lantern) has John Stewart and Katma Tui, a couple of Happily Married Green Lanterns. John and Katma join Hal Jordan in his journey to Zamaron and fight side by side when a Zamaronian squad tries to intercept the trio.
- Silent Partner, Unfinished Business puts Misa Amane and Naomi Misora in this role. Naomi is Misa's bodyguard, Misa is Naomi's interpreter... once they start evading the police, shooting Yakuza, and getting choked out by shinigami, Naomi makes the plan of attack, but due to her inability to communicate subtle changes, has to go along with Misa's execution once it starts.
- Frail Equilibrium: Dante and Tess gradually develop the rapport to fight as a duo - complete with their own little inside jokes. As some unfortunate demons found out, the only thing worse than fighting Dante or Tess is fighting both of them.
- In Whyand Were, Assassin Johanna Smith-Rhodes provides the muscle and fighting ability; wizard Ponder Stibbons is the magical half of the relationship. It is established over several stories, especially in Slipping Between Worlds, that she would kill for him and he would put his life on the line for her.
- Crowns of the Kingdom:
- Donald and Daisy combine this trope with Dance Battler in the jungle concert scene.
- Cinderella and Prince Charming do this as well, teaming up to rescue the Disney Princes.
- Varric and Bethany gradually evolve into one of these in Beyond Heroes: Of Sunshine and Red Lyrium. It becomes obvious enough that the companions start remarking on it.
- Both of the main couples in the Twice Upon an Age series do this a couple of times; given that it covers the events of Dragon Age: Inquisition, it's par for the course. Mahanon and Cassandra get more opportunities, because Cassandra is an active party member, but Cullen and Victoria take a few turns when circumstances permit it. Dorian and the Iron Bull also fall into this occasionally, and it's indicated that so do Varric and Bethany at least once.
- Petra and Brynjolf in Drakonophobia though prone to splitting apart, there are times where they really work well together, before and after they actually get into a relationship. And The Nerevarine fights alongside Older!Ayisha often as well, as warrior and mage respectively.
Game of Thrones / A Song of Ice and Fire
- The King Nobody Wanted: In an Adaptational Sexuality moment, Tytos recalls that his long-ago opponents Maelys Blackfyre and Derrick Fossoway were lovers, and both men were very formidable adversaries on the battlefield.Tytos: They were boon and close companions, who kept a single tent between them. When Ser Derrick was called on to surrender [after Maelys died in battle], he declared, if I remember correctly, that we had slain his heart, and he would not be still until the rest of him followed.
- Purple Days: Joffrey and Sansa become one after the latter is brought into the "Groundhog Day" Loop and starts training in martial arts and magic. While Sansa will never be Joffrey's equal in combat, she's grown skilled enough to hold her own on the battlefield and has her newly developed mastery of shadowbinding and other dark magics to make her just as deadly as him.
- Abraxas (Hrodvitnon) (MonsterVerse): Godzilla and Mothra are heavily implied to be this, based on some of their more intimate interactions when they're not battling as a team for the fate of the world.
- Kaiju Revolution: Rodan and Radon, the two Mandas and Zilla and Komodithrax and the skullcrawlers. Sadly, King Ghidorah kills off Radon, the male Manda and both Zilla and Komodithrax. However, by the end of his entry it's implied that the two remaining Gorosaurs have now become this... only for the female Gorosaur to be killed by Gaw in Season 2.
Grandmaster of Demonic Cultivation: Mo Dao Zu Shi / The Untamed
- Wei Wuxian and Lan Wangji in The Beast Of Gusu often fight alongside one another during the attack on Cloud Recesses and for the rest of the Sunshot Campaign. The one time they split in battle, they ended up not seeing each other for three months.
- In A Game for the Fool, Wei Changze and Cangse Sanren were this: they night hunt together, working as a husband-wife team.
- Some Semblance of Meaning: Near the end of the 44th Hunger Games, Vale and Obsidian become one of these. Although the latter doesn't want the former to be put in harm's way, she does manage to save his life at least once.
- In Infinite Stratos: To the Other End of the World, there are quite some battle couples. Hackers are trained as Bash Brothers, but in later chapters, the hackers discover they can work pretty well with Infinite Stratos pilots as well. An example that is most prominent are Kerlongsj and Chifuyu fight as one and they take out an entire army with just the two of them. Due to their history, they're quite good at it, despite the huge difference in style, weapons and special powers.
- The My Hostage, Not Yours series has Zim and Gaz, seeing as they're the primary couple and both badasses.
- Ryuko and Mako form one during the Naturals Election in Chapter 7 of Natural Selection when the Safe Zone gets attacked by the other clubs, with the two of them kicking their collective asses.
- Kim and Shego in At the Centerfold of the Storm. Unlike in most Kigo fics that focus on the two settling down and starting a family, Kim and Shego decide to continue in the Secret Agent/Super Hero line of work, such as battling volcanoes, fighting Humongous Mecha on foot and taking on the entire criminal underworld.
- Life After Hayate explains that this is a family tradition with the Harlaowns, to the point you are not considered acceptable dating material unless you've partnered with your desired date in combat. It's not necessary to fight directly alongside them, but close dependency in a combat situation is absolutely non-negotiable: Amy Linetta was allowed to date Chrono because she had been his "angel on the shoulder" as Arthra's combat controller. Lindy and Clyde supposedly met on the bridge of a warship in action; Chrono's grandmother and grandfather met when their units were assigned to the same battle. Chrono expresses relief that Fate is interested in Nanoha because she already meets the standard.
- In X-Men 1970, Cyclops and Jean Grey get married, move out of New York and become a crime-fighting couple in the town of Ector.
- Spotless: When Master Fu finds out that Kagami knows Marinette's secret identity, he meets her in person and decides to give her the Dragon Miraculous full-time.
My Little Pony: Friendship Is Magic
- The Immortal Game: Twilight's parents Starlight and Midnight. Also, as shown in flashbacks, her ancestor Astor Coruscare and her lover Valiant. It Runs in the Family.
- Friendship is Magic: The Adventures of Spike: Soarin' and Spitfire are one, as shown during the changeling invasion.
- The Pony POV Series has the Dark World versions of Spike and Rarity, once Rarity finally returns his affections and they become an Official Couple. (One of the few good things to come out of Discord's reign was Spike reaching his adult age in Rarity's lifetime.)
- Cadance and Shining Armor are naturally this trope, as in canon.
- Gag and Garnet have their moments, but since they're in a unit, it isn't as noticeable as other examples.
- During the Final Battle of the Age of Myths (G1), Katrina and Rep (now Happily Married) are one of these when Gondor Calls for Aid. They kill Ashley, one of Hydia's dangerous family, by sending her falling to her death with a Fast Ball Special.
- Whenever Vinyl Scratch and Octavia get into a fight in The Vinyl and Octavia Series, you can bet that they'll be fighting side-by-side.
- Naru-Hina Chronicles:
- Naruto and Hinata rarely get a chance to team up, being assigned to separate teams. But when they do, much ass-kicking ensues.
- After Sasuke comes back to Konoha, not only does he rejoin Team 7, but he reciprocates Sakura's feelings, allowing the two of them to become this trope.
- Most couples in Son of the Sannin are shown fighting side by side at one point or another (Naruto and Hinata being the most prominent example), but special mention goes to Shizune and Shisui, who team up with the intent to kill Danzo after he has their infant children kidnapped.
- Advice and Trust: Shinji and Asuka, natch. And given the nature of Evas, they're not merely more competent as a result, but more powerful as well.
- The Child of Love: It took a good while for them to open up to each other, but Shinji and Asuka got together and kept fighting giant monsters together. In chapter 3 it is not until Asuka rushes in the battlefield that the team gains the upper hand. In chapter 7 she does not fight directly due to her pregnancy, but she provides tactical support. After giving birth she and Shinji fight in tandem.
- A Crown of Stars: Shinji and Asuka. Their numerous battles together in the past are mentioned. Moreover, Asuka's new Humongous Mecha is a two-seater, allowing Shinji and Asuka sitting together in the cockpit.He smiled at her in the comm window. "You said it, Asuka. You finally said it."
She blinked at him. "Said what?"
"'I love you.'"
Asuka stared blankly at him for a second before it sank in. Her eyes widened. "Well… scheiße…" she said eventually. "So much for talking about it tonight in more romantic surroundings. When I said 'right before a battle isn't exactly how or where I want to talk about this', I did mean it."
Shinji's smile got bigger. "Somehow, right before a battle for our lives seems fitting for us." - Doing It Right This Time: After returning to the past Shinji, Asuka and Rei are working towards becoming a battle triad.
- Evangelion 303:
- Shinji and Asuka (reinforced since their engagement). Misato even commented that both are hyper-aggressive.
- Kaworu and Saburo when they were dating.
- Ghosts of Evangelion: Shinji and Asuka are one during the War. Thirty years after the conflict their experience fighting together still helps them beat games together.
- HERZ: Shinji and Asuka, although due to Unit 02 getting repaired they are not seen battling in tandem until the Final Battle when they sortie together to fight the SEELE forces.
- Higher Learning: As their relationship strengthens throughout the story, Shinji and Asuka become an efficient fighting duo.
- Asuka and Shinji in Neon Genesis Evangelion: Apotheosis Echo become this over the course of the fic, starting with a rather different encounter the night before the battle with Israfel and only growing as time goes on.
- Also Daniel and Eleanor Theisman, who are Colonels in the Worldstrider Corps beyond simply being part of the Engineering division of NERV, and are skilled with their Interfacing abilities and how to apply them in various forms of combat.
- Asuka and Shinji in Neon Genesis Evangelion: Genocide are a couple and when they're together, they fight better and harder. When Samael fought both, it defeated Asuka, but when it was about to crush Shinji, Asuka went berserker and killed Samael. They also fought the MP-Evas and the final Humanoid Abomination back-to-back.
- In Neon Metathesis Evangelion, that is Asuka and Rei. Not so much Shinji. Shinji never moves past his loathing for piloting and would prefer to just stay the Team Chef and the triad's moral support.
- Once More With Feeling (Crazy-88): Asuka and Shinji started on the path to becoming one as of battling the Sixth and Seventh Angel. They fought together and performed spectacularly.Not that Shinji could begrudge Asuka her grand entrance. Perhaps she hadn't exactly covered herself in glory today... but by the same token; he couldn't have done it without her. Not for the first time, he smiled slightly at that thought, working side by side with her again; Asuka the burning sword, Asuka the raging, unquenchable firestorm-
- The One I Love Is...: Shinji and Asuka. Due to living, working and fighting together, they started to like each other and became extremely close. This closeness kicks the plot off when Rei realizes Shinji is falling for Asuka and decides to pursue him actively.
- Scar Tissue: Shinji and Asuka. During the Angel War they battled giant alien monsters together despite of their fights and arguments. In chapter 17 Asuka's Humongous Mecha is modified so that Shinji and she can pilot in tandem and fight together. Shinji also tells her he will not leave her to fight alone again.
- The Second Try: Shinji and Asuka, even more than in the original series now that they are serious about fighting, have gotten over their crippling psychological and emotional problems, and want to support and help each other. It even is noted by Kaworu.
- In the second-to-last episode:
Asuka (to Shinji): I'll handle them. These guys aren't the real problem after all. Just take care of my cable, okay?
Shinji (smiling weakly and nodding): Of course.- And later in the same episode:
General: Concentrate all fire on that power cable!
Comm-Officer: It's no use, Sir! Purple's guarding it!
- In AAML: Diamond and Pearl Version, Ash and Misty swiftly become this after Misty rejoins Ash during his travels in Sinnoh, with the two developing a comfortable routine working together in double battles; their common team-ups either call on Charizard and Gyarados when facing opponents they need to overwhelm with raw power or Grotle and Vaporeon when they need a less direct approach, the first two being their powerhouses while Grotle and Vaporeon represent Force and Finesse.
- As Fate Would Have It: Nate and Yancy have been forced into Pokemon battling together as a Multi Battle team twice: during the Shadow Triad's Assassination Attempt on Nate and Black, and when a bunch of Loony Fan Poke Maniacs threatened her and Nate.
- In the ending sequence of Eggman Hates Furries Sonic and Tails are revealed to be a couple.
- CWCollateral: A Tale of the Resistance:
- Bubbles Rosechu and Blake Sonichu fight as a team.
- Sonic and Amy Rose run into battle holding hands.
- Averted with Sonichu and Rosechu; unlike the other female Rosechus of the Chaotic Combo, she is absolutely worthless in a combat situation, even when transformed into "The Incredible Lioness".
- In What You Already Know, Daniel Jackson and Sam Carter have no problem fighting alongside each other as their relationship unfolds, with Daniel's psychic powers mixing well with Sam's military experience, although they have to be granted special dispensation to continue their relationship after Sam is promoted to team leader.
- In chapter seven of Bait and Switch (STO) a pair of junior officers from the USS Bajor's security department, Lieutenant (JG) K'lak and Ensign Kate McMillan, go on an away mission with Eleya and act as a sniper and Target Spotter respectively. In the next chapter Eleya catches them meeting up in Ten Forward, and McMillan gives K'lak "a peck on the cheek that looks a lot more than just friendly." Eleya alludes to moving McMillan to a different supervisor.
- Khan and his lover, Victoria, are this in the Star Trek (2009) fanfic Safe and Sound. During the Eugenics Wars they apparently marched into the Taj Mahal, and after the ensuing battle (during which Victoria killed thirty armed guards with her bare hands while saving Khan from them; it's not mentioned how many Khan killed) they marched back out again having claimed the building as theirs.
- Blood and Honor: Sanguis and Quinn, though they go back and forth on the "couple" part for about half the story due to Quinn's personal issues. Eventually they end up together on and off the battlefield. Sanguis typically gets in close with her lightsabers to take out the biggest threat while Quinn uses his brains and blaster to wreak havoc from a distance.
- Although they're one in canon already, it shows with Han and Leia in The Princess And The Pirate. Han, Leia and Luke have ended up captured. Han's already been dragged off and severely beaten once. He's got assorted fractures, bruises, internal injuries and a high fever. But the moment some of the guards start turning their attention to Leia, Han's on his feet, giving them a Death Glare and warning them that they're dead if they touch her. They do realize that he means business, even in his condition. Later, when they try dragging Han off again, Leia unleashes on them with Force power, because there's no way she's going to let her husband get tortured some more.
- Red Ranger Sean O'Callahan and Yellow Ranger Maria Aparicio of Power Rangers GPX fit this bill once they start dating. They even get the occasional Back-to-Back Badasses moments.
- To-Love-Death has Rito and Yui fighting to survive against a zombie invasion. In its sequel, To-Love-Carnage, they get even.
- Fuzzy Memories has Tempest and Zetsu, who have a strong and healthy relationship, but nonetheless are both badasses in their own right, and by the special of the series, the two are now on-par enough that the latter can actually keep up with his girlfriend in terms of hunting and fighting, despite not being nearly as close to her strength.
- Total Drama: Battle of the Generations: Shawn and Jasmine. Both are strong competitors on their own, but together they help their team win three challenges in a row.
- Atonement:
- Battery and Assault, two veteran superheroes, are married.
- Main character and rookie hero Tether and her girlfriend Sundancer after the latter joins the Protectorate.
- Robyn Wilde and Hannah Savage from Take a Stand: Star of Ceartais, who begin dating a while after the start of the story, become this once being recruited into Team Ceartais as (respectively) the Undying Scarlet and Bullet.
