Fire-Forged Friends in Fanworks.
- In Avengers: Infinite Wars, when Steve Rogers, Sam Wilson and Scott Lang find themselves on the planet Naboo in the middle of a Separatist invasion, they all prove themselves to the Republic when they immediately leap to the defence of the Naboo civilians without knowing anything about the wider context of the current war. As more Avengers are discovered, Rhodey, Hope Pym, Pietro Maximoff, Peter Parker and Matt Murdock are each confirmed to have made a similar impression on the natives of the worlds they arrived on (Natasha went undercover until she could rejoin the others and T'Challa, Vision and Wanda arrived on more peaceful planets).
- Cenotaph features the Skitter and the Undersiders. Not as close as in canon yet, but still on good terms, and friendly... And also Purity, who joined up while Taylor was fighting the ABB. Both helped each other, Taylor giving Purity hope that her attempts to clean up Brockton Bay would bear fruit, and Purity giving Skitter an ally in a time when she felt very alone.
- Corrin Reacts: Flora and Corrin's relationship begins like this. Back when they were younger, Flora, out of hatred for Garon and wanting to return home after being kidnapped, attempted to flee the Northern Fortress and nearly dies after falling into a canyon. Corrin saving her life and nearly dying himself in the attempt due to a blizzard instantly earns him her respect and both become fast friends after they recover.
- In Cross Cases, nearly every development in Sam and Harry's brief friendship is brought upon by one of the fic's several fight scenes, each one bringing them closer together (and also revealing something new and scary about Sam in the process).
- Dekiru: The Fusion Hero!: This literally happens in the case of Izuku's human fusions. Every time he fuses with someone to create a new fusion, they become much friendlier with him after de-fusion, to the point of being on a First-Name Basis with him. After all, it's hard to remain aloof with someone you've physically and mentally fused with. This also applies to multiple-person fusions, for all the component partners. After Tsuzuru de-fused, Minoru and Tsuyu weren't just friendlier with Izuku, but also with each other as well.
- Deliver Us from Evil Series: Mortality: Holmes and Watson, are, like counterparts are genuinely close to each other, but the events make them even more closer than they already were.
- Reimu and Megas's crew become these in Fantasy of Utter Ridiculousness as a result of the fight between Coop and Yuuka. It's not until after Megas leaves Gensokyo that Gensokyo's protector is able to admit this to herself, though.
- Fate: Zero Sanity: This happens between Saber and Berserker. While they were certainly on friendlier terms than most of the other Servants at the beginning of the fic, they were still enemies. Fast-forward three battles, with an official alliance and several emotional moments thrown in there, and they have the most positive relationship of all the Servants, proudly considering the other friend. So much so that Saber actually forgives the later (in her thoughts) when she stabs her in the chest to try and stop her from destroying the Grail, spending her last moments reflecting on their time together and thanking the Servant for that.
- Hetalia: Axis Powers fanfic Gankona, Unnachgiebig, Unità
: Believe it or not, the former Axis Trio was not always close. Like in canon, Germany was borderline abusive towards Italy while Japan was aloof. However, through Italy's refusal to be put down by them and continued kindness towards them, they warmed up to him. That, and having to work together through WWII and the Cold War also helped in cementing their bonds. Probably. - The Teenage Mutant Ninja Turtles/Gargoyles fic Gargoyles and Turtles: Unsung Defenders opens with the turtles running into Goliath and the Gargoyle Trio when the two groups are on their first patrol of New York. While the two are very different, they end up joining forces to fight the Kraang in their debut, which leads to members of the two groups bonding with the relevant counterpart during and after the fight; Leonardo and Goliath recognise their shared responsibilities as leaders, Donatello encourages Lexington’s interest in technology, Michaelangelo and Broadway share a fondness for food, and Raphael and Brooklyn hit it off for their more violent tendencies.
- The members of Hakumei fall under this.
- Fighting through the massive disadvantages of fighting on the villain team, training together and fighting alongside each other in the civil war exercise made the Villain Team in Hero Class Civil Warfare become friends despite their previous animosity or indifference towards each other.
- Learning How to Be a Witch: Like her younger sister, Lucila Noceda befriended a few of her enemies and turned them into friends.
- With the Blight Twins. While they started of on friendly terms, with Lucila even taking a liking to Edric, after they tried to steal Amity's dairy and were unsympathetic about it, she was non too happy to see them again in Adventure in the Elements, yelling at them not to call her Luci, and not even wanting to be anywhere near them. But after the two protected her from the Slither Beast and apologized for their actions, Lucila finally forgave them and the three rekindled their friendship.
- Like Luz, she also disliked Amity for being mean to their friends, and had slight doubts about Luz befriending her in Lost in Languag. But she eventually warmed up to Amity, after she saved Luz from monsterized Otabin and seeing her become more kind-hearted in Understanding Willow. Come Enchanting Grom Fright, Lucila finally accepted Amity as a friend and, after discovering her note, even promised not to tell Luz about the secret crush she had on her.
- Hunter is the most notable. Like Luz and Amity, the two started off disliking each other. But as time went on, they grew closer, Hunter falling in love with her, until Kikimora drove a wedge between them by framing him for the Owl House raid in Agony of a Witch. But even after Lucila learned the truth, they still weren't on good terms due to the bad things he deliberately did as the Golden Guard. From there, their relationship became complicated. In Yesterday's Lies, Hunter called her and admitted he messed things up between them and she forgave him, since then, they're relationship was on better terms, until the two rekindled their love and became a couple.
- The Mega Man X fic Limitless Potential shows that Zero wasn't interested in being friends with X when he first joined the Maverick Hunters, until X saved him and Vile from a rogue mechaniloid during a mission. While Vile was obviously outraged, Zero was grateful to X and from there on out the two became close friends.
- In The Lost Cause, fellow manipulators Nie Huaisang and Jin Guangyao become friends after successfully conspiring together to kill Jin Guangshan. While they'd spent time together before, Huaisang had been faking a lot of his interactions with Guangyao prior, while their one major social engagement in the fic largely comes about (in Huaisang's opinion) because Guangyao is really lonely.
- The Many Dates of Danny Fenton (Danny Phantom Western Animation, TV Series, and Comic Books.):
- In Origins, a Mass Effect/Star Wars/Borderlands/Halo Massive Multiplayer Crossover, Aria's assault squads end up fighting alongside geth who by their own words had never interacted with organics before.
- On the Run opens with Clark Kent (Smallville) on the run from Lex Luthor after his mother died during Brainiac's assault and Lex learned that Clark was an alien. However, he still takes time to save Letty Ortiz (The Fast and the Furious) from the event that would have led to her near-death experience, which prompts Letty to help Clark track the people responsible for the apparent death of Chloe Sullivan. Once Clark meets the rest of Dom Toretto's crew, Dom affirms that he owes Clark a great deal simply because he saved Letty's life.
- Outsiders: Louise and Saito, when they first meet, can't stand each other. After an attack by a horde of Beedrill, however, the two learn to work together and end up becoming best friends.
- A few sidestories of Pokémon Reset Bloodlines have this dynamic:
- In the Gardenia Interlude, the title character ventures into the Eterna Forest to find Cheryl, who has gone missing for a week. A challenger named Sho shows up as soon as she exits her Gym, and ends up following her to the forest and eventually to the Old Chateau to find Cheryl.
- In the Laramie Gaiden, Leeroy Laramie, a Trainer, and Jenkins Jackrum, a Ranger, have to set aside their differences to survive when they end up stranded on a Deserted Island (their respective nations are at war with each other over conflicting philosophies about Pokémon).
- The Agatha & Sam Gaiden shows an adventure of Elite Four Agatha and Professor Samuel Oak when they were young trainers and rivals. They are forced to venture into the depths of Drowning Woods when Agatha's younger brother goes missing.
- The Raven's Plan:
- Jonos Bracken and Tytos Blackwood have set aside their life long animosity and become Heterosexual Life-Partners after having to fight the Others together.
- The main reason why Jaime isn't executed by just about every House after everything he did in the last life is because he fought and died alongside them during the Long Night. The fact that he and Tyrion were the only members of House Lannister to volunteer to fight (and the fact that he actually killed Cersei, ridding them of her madness) earned him their respect.
- The Diva Army from the WWE fic, The Return-Remixed. At the beginning of the story, many of them were enemies, but united purely by their desire to vanquish DEAR. By the end of the story, just before the climactic battle royal, Natalya points out how she didn't particularly care for some of them a few months earlier, but now considers them friends and the ones she wants fighting by her side.
- In The Slayer Prophecy, Batman and his allies adopt the identity of ‘Uncle Matches’ and his children as a convenient cover to interact with the Scooby Gang in a civilian environment. While the identity is just a convenient cover at first, after the two groups have worked together to defeat Rack, the Joker, Dala and the Monk, in their final solo conversation in Buffy’s house, Batman and Buffy refer to each other as uncle and niece when they don’t have to keep up a pretence for anyone, with Batman acknowledging his respect for the Scoobies' abilities as he and the others return home.
- This happens with Vale and Obsidian in the Hunger Games fanfic Some Semblance of Meaning. Initially, she distrusts him completely and hates him even past the point of rationality, while he views her as a nice person, but a rival nevertheless. However, after the two meet again in the arena while fighting a mutt that killed people that they both cared about, they become allies and friends... and even more than that.
- Son of the Sannin has a case of Fire-Reforged Friends with Sakura and Ino. Like in canon, they're rivals with each other, although Ino is no longer interested in Sasuke due to being bitter because Sasuke's mother killed Ino's father during the Uchiha Insurrection. During the end of Part I, they fight together against Sakon and Ukon, and after the experience they reconcile with each other and become friends once more.
- Their Journey: All of the protagonists become this over the course of the story, most notably expressing itself at the end of Chapter 8.
- This Bites!: Cross and Tashigi end up as this, or at least Fire-Forged Friendly Enemies. Anyway, the aftermath of the encounter with Mr. 3 results in Tashigi developing respect for Cross.
- In Three Strikes, Trigger becomes close friends, first with Spare Squadron with all the shit they have to put up with and helping them become a real squadron, and with the LRSSG, as she leads them to victory after victory.
- In Through the Looking-Glass, the crews of Serenity and the Demetrius had already tentatively agreed to work together after the Demetrius crashed, but after they team up to stop a gang of thieves trying to take Serenity’s cargo and kill or rape the crew, even the revelation that Sharon’s a Cylon doesn’t deter Mal and Zoe from affirming they will now consider the other crew their friends.
- In Torque (Jak and Daxter), while they had already been friends before, Keira and Daxter hadn’t had the same bond that the latter had with Jak. As the story goes on and they take on missions for the Underground and delve into their personal quest to save Jak, their friendship grows stronger.
- With This Ring:
- Invoked by the Paragon protagonist when recruiting Prince Ragnar for the Orange Lantern Corps. Ragnar is proud, and upset by having lost a duel to Paul, which means his desires are focused on beating and deposing Paul — which is a problem when wielding a ring powered by avarice. Paul takes him on a dangerous mission to Qward so they can work together and bond; by the time they've fought their way into the core of the planet, Ragnar has gained a lot of respect for him.
- The Renegade protagonist starts off on the wrong hoof with Princess Luna when they first meet, with her thinking that he's King Sombra, and attacking him. After they get trapped together inside his mind, though, and have to fight against distorted copies of the Elements of Harmony spawned by the Anti-Life fragment embedded in his soul, she warms up to him a lot, and they later start dating.
- Zootopia 2 The Movie: Because of his strong dislike of cops, Bart doesn't necessarily get along with Judy and Nick at first, especially not Bogo, and makes two attempts to escape from them while the mammals view Bart as trouble making nuisance with the potential to cause a panic and want nothing more then to be rid of him. But after having some fun at a hotel they are hiding out in and saving Judy's life Bart starts to become friends with Judy and Nick and vice versa. He also gains a grudging respect for Bogo after he comes to their aid during the Final Battle.
