Cain And Abel / Video Games

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• Age of Wonders has Meandor and his half-sister Julia. They got better, even becoming allies in Shadow Magic.
• The main villain of Akuji the Heartless is Akuji's vengeful, power-hungry evil brother, who plots for Akuji's assassination during his wedding, and intends to start a clan war in Akuji's abscence.
• Assassin's Creed IV: Black Flag strongly suggests that the Assassin Opía Apito and the Templar Lucia Márquez were actually half-sisters with the same father, though neither woman seemed aware of this. The former is obviously Abel in that she was trying to protect her tribe from the Cain Lucia's attempted genocide of them for the (likely justified) death of her father at the tribe's hands.
• The backstory in the Assassin's Creed universe flavors the story of Cain and Abel itself for use in the franchise mythos. Their parents, Adam and Eve, were the first two Isu/Human hybrids to break free of the mind controls of their Isu masters. Cain killed Abel over one such device (fittingly called Apples of Eden), and the branding he got for his crime evolved into the symbol for the Templars.
• In Backyard Sports, Angela and Tony Delvecchio, siblings, play better on opposite teams in many games. This makes it tough to defeat one sibling using the other on a team.
• Baldur's Gate:
  • Baldur's Gate plays this trope straight in the first game, then takes it to its logical extreme in Baldur's Gate II: Throne of Bhaal, wherein five of the six required bosses are siblings of the player and of Imoen, who may or may not be in the party.
  • Baldur's Gate III potentially has this between Orin and the Dark Urge. Both are Bhaalspawn, the former being Saverok's granddaughter and the Dark Urge given life from Bhaal's own blood, thus making them niece and uncle/aunt respectively. Although the Dark Urge was just as psychotic and bloodthirsty as Orin in the past, their amnesia gives them the chance to fight off the urge while also opposing Orin and her fellow cultists. It also helps that Orin personally despises the Dark Urge because they're Bhaal's favorite child, and she betrayed them in the hopes of earning the god of murder's favor as their "replacement".
• Hinted at in The Binding of Isaac. One of Isaac's playable "siblings" is the literal Cain, and a power-up is a ghost baby named Abel. Whatever Isaac/Cain does, Abel does the opposite. If fan theory is to be believed, Cain and Abel represent Isaac and Maggy, as he feels guilty for hating her while she was alive, and blames himself for her death.
  • Another reference to Christian mythology, Tainted Jacob is pursued by Dark Esau that tries to kill you throughout the game. You have to avoid letting him touch you or get killed, or else you turn into the Lost minus Holy Mantle for the rest of the floor. That being said, his attacks will damage other enemies and can wipe out early game enemies quickly.
• BlazBlue:
  • A lot of drama is centered on protagonists Ragna the Bloodedge and Jin Kisaragi. Their bad blood comes mainly from Jin abandoning Ragna to die in their burned down Church home and letting their sister Saya be kidnapped when they were children. Jin's motives are mainly: 1) Since Ragna would eventually become a harbinger of destruction due to gaining an Artifact of Doom after said Church incident, Jin was chosen by the powers that be to be an "Antibody" to stop him. 2) His sword is an Evil Weapon and drives him to homicidal psychosis whenever he's around Ragna. Naturally, they can't stand each other, even when they're on the same side eventually.
  • Central Fiction reveals this as the motive of series villain Yuuki Terumi. He is Susanooh, jealous and spiteful brother of Amaterasu.
• In Boktai, Django later finds out Sabata is his (initially) evil, half-brother.
• Borderlands gives us Jaynis and Taylor Kobb. Taylor hires you to kill his brother so he can take over Jaynistown… and then turns out to be even worse so you have to kill him too.
  • Borderlands 3: Aurelia Hammerlock's relationship with her brother, Sir Alistair Hammerlock, has devolved from her being a bullying big sister, into this. As a child, she drowned a pet lizard Hammerlock took care of (it was originally hers) in a way that made him believe that it was his own fault. In the game proper, she allies with the Children of the Vault and the Calypso Twins. She sells her brother out to them and attempts to forcefully take over the Jakobs corporation as their new CEO. All of this is done for little other purpose than to relish in Alistair's suffering. Hammerlock, being the Nice Guy he is, tries to peacefully talk things out with her one last time; Aurelia's response is to shoot him in the gut and freeze both him and his boyfriend Wainwright Jakobs solid and they both would have died had the Vault Hunter not intervened.
  • Taken to the extreme with Katagawa Jr. He murders all of his siblings at a party he was hosting, just so HE could be the new CEO of the Maliwan corporation. One of his sisters, Naoko, managed to escape, though. She's forced into hiding in Promethea, and is left with a burning hatred toward her utter monster of a brother.
• The ending of Breath of Fire III reveals that Bleu/Deis, protector of the Dragons, is actually the Goddess Myria's sister.
• Capella's Promise has the princes, Zanara and Wolt, who go to war with each other because the former (the Cain of this relationship) is using an ancient weapon to turn their citizens into a monster army. The main character Velk turns out to be their half-brother and sides with Wolt, but he doesn't exactly fit into this dynamic because he doesn't personally know Zanara.
• Celestial Hearts: Helen is an angel and the sister of Lilth. At the start of the game, Lilith drained Helen of most of her energy in order to gain the power to destroy the world. The only reason she doesn't immediately destroy the world is because she wants to give Helen a false sense of hope in stopping her. Right before the final battle, Lilith reveals that she's jealous of how Helen was born with free will and was allowed to have a fulfilling life while the former was made into a puppet of an evil deity.
• In Clive Barker's Undying, all the Covenant children fell to the curse of the Undying King, only to be resurrected as monstrous forms of their previous selves. They're out to kill Jeremiah, the last surviving son, to complete the curse.
  • There are also Bethany and Aaron, twins who utterly despised one another and were in constant rivalry. Bethany won, by chaining up her brother in a dungeon accessed through her room to be eaten by rats, and removing his jaw so he couldn't scream.
• In Command & Conquer: Renegade, the series-wide Big Bad Kane is hinted to be the biblical Cain, as the Temple of Nod in Cairo has Abel's tomb in its catacombs.
• Aku Aku and Uka Uka in the Crash Bandicoot series, being the Big Good who rallies Crash and the Big Bad who has Neo Cortex under his thumb, respectively.
• King Noob and Nebulous Noob in The Day The Noobs Took Over Roblox 3. Both still care for each other, but when their parents were killed for their noobanium caused both of them to radically change. While King Noob simply only wanted to conquer Roblox, Nebulous straight up destroyed it.
• Kasumi and Ayane of Dead or Alive. They were best friends as children, especially given Ayane's status as a village pariah. When they discover that they are half-sisters and Ayane is the product of rape, Ayane turned on Kasumi out of jealousy that the former was raised in luxury and beloved by everyone while she was scorned and hated by the same people, and is currently the one tasked with assassinating Kasumi after she left the village to pursue Raidou. Unlike most examples, however, Ayane isn't evil, just Anti-Heroic, and as of the ending of Dead or Alive 5, they seem to have reconciled.
• Dante and Vergil of Devil May Cry. In the original series, it was primarily Dante and Vergil's differences in regards to which side of their nature they embraced, while in the new game, it is more a question on whether the Nephilim should let humans decide their own fates (Dante) or rule over them (Vergil). Devil May Cry 5 describes their relationship quite well right before defying the trope, as Nero already hates himself for losing his childhood friend Credo and isn't in the mood to let his father or uncle die.
  "A brotherhood defined by hatred and grudging respect. A rivalry for the ages. Vergil and Dante clashed... all their grievances, their enmity, their reasons to fight, focused into one decisive battle. But this would not be their end... Nero, having found his own reasons to fight, comes between his father and uncle. There will be no fratricide this day."
• It's quite literal in Devil Survivor, where Naoya, the protagonist's older cousin, is revealed to be the original Cain, while the protagonist possesses Abel's essence (along with a bunch of other people, apparently). The dynamic's a little different though, as Naoya does not want to hurt the protagonist: He wants to make Abel reject God and become the king of Bel, and serves as a Stealth Mentor for most of the game to nudge you in that direction. He will only fight the protagonist's group in the Law and Atsuro endings, and in the latter case it's more a Secret Test of Character to see if the protagonist has the will to enslave the demons.
• This trope is what led to Fuuka's murder in Disgaea 4.
• One of the most iconic sibling rivalries comes in Double Dragon, in which Billy and Jimmy fight each other at the end. The NES version takes it one step further, as Jimmy is the leader of the Black Warriors, making him the Cain to Billy's Abel by default.
• This comes up several times in Dragon Age II. Near the end of Act I, Bartrand succumbs to greed and the lyrium idol's curse and tries to kill Varric to avoid sharing the wealth. Varric can either kill Bartrand as payback, kill him to save him from the lyrium idol's corruption, or put him in an asylum to care for him. In the "Fool's Gold" sidequest the middle brother Iwan leaves his older brother Emerys and his younger brother Merin to the darkspawn so he can claim a valuable magical sword for himself. Varric will even mention that this story is awfully similar to what happened to him. In the endgame, if Hawke supports the Templars, he/she may end up fighting and executing Bethany if she joined the Circle. Oddly enough, Hawke's more antagonistic sibling Carver will never fight Hawke and even defends him/her as a Templar when Meredith orders him to kill Hawke. This can also occur with Fenris and his sister Varania after she sells him out to his former master so that she can become a mage apprentice. If the player does not interfere, Fenris will kill her.
• The Elder Scrolls:
  • In the series' lore, Anu and Padomay are the anthropomorphized primordial forces of "stasis/order/light" and "change/chaos/darkness", respectively. They are usually referred to as brothers, twins to be specific. Their interplay in the great "Void" led to Nir, "creation". Nir loved Anu, which Padomay hated. Padomay wounded Nir, but before dying, she gave birth to twelve worlds. Padomay shattered these worlds but was stopped by Anu, who wounded Padomay and presumed him dead. Anu then salvaged the pieces of these worlds to create one world, Nirn. However, Padomay returned and wounded Anu, spilling both of their blood. Anu pulled Padomay outside of time itself, ending his threat to creation. From the blood of Anu and Padomay came the et'Ada, or "original spirits", who would go on to become either the Aedra or the Daedra depending on their actions during the creation of Mundus, the mortal plane. (Some myths alternatively state that the Aedra came from the intermingled blood of Anu and Padomay, while the Daedra came only from the blood of Padomay.)
  • Morrowind:
    • The Dren brothers — Vedam Dren, the noble duke of Vvardenfell, and Orvas Dren, the leader of the xenophobic criminal organization, the Camonna Tong. Vedam doesn't want his brother killed, but isn't overly angry if it comes to that, while Orvas… is planning to murder his brother, which you can use to blackmail him if you find the implicating letter.
    • Sjoring Hard-Heart and Radd Hard-Heart. Sjoring is the leader of the Fighter's Guild and very much in the pocket of the aforementioned Camonna Tong while the other is an honorable officer of the Imperial Legion.
  • Skyrim: Alduin and Parthunaax, Alduin is the primary antagonist of the game who is the Firstborn of Akatosh and leader of the dragons who in the ancient past decided to conquer the world and have mortals worship him or enslaved. Parthunaax, his younger brother chose to side with the mortals and aided them in defeating Alduin, becoming the leader of the greybeards and living atop the highest peak in Tamriel for a millennia meditating on the way of the voice in order to atone for his former crimes as Alduin’s Lieutenant, becoming an ally to the last Dragonborn and helping defeat Alduin when he returned.
• Mickey Mouse and his older half-brother Oswald the Lucky Rabbit are this in Epic Mickey.
• Eastern Exorcist has the sworn brothers variety. The player hero, Lu Yun-chuan, is the titular exorcist and on the side of good, but his foster sibling, Zhang Huai-zhou, is a traitor secretly aligned with the forces of evil for more power.
• Exit Fate also contains two such siblings (in this case, twins of opposite genders): Brunhild and Daniel. Clearly, SCF likes putting siblings at odds with each other…
• The premise of Fable III. Big Bad Logan is the tyrannical ruler of Albion you must overthrow and the son of the previous game's player character. He also happens to be your older brother. Depending on your own approach, you can potentially be better or worse than him.
• In FEAR, it's explicitly canon that Alma (the homicidal female ghost) is the Point Man's mother, Paxton Fettel (The Dragon) is the Point Man's brother, and the Mad Scientist responsible for the creation and birth of both the Point Man and Fettel was Alma's father Harlan Wade, who ruthlessly exploited his naturally born daughter's psychic abilities in an attempt to create Super Soldiers. All in all, they're a Big, Screwed-Up Family.
• Fear Effect: Retro Helix. Glas and Drew, with Glas being Abel and Drew being Cain. Rain and Mist, with Rain being Abel and Mist being Cain. Subverted in both cases, with Glas and Rain not only surviving the attempts on their lives but end up killing off Drew and Mist.
• In The Feeble Files, Feeble's brother has no issues setting his brother up to be erased by the authorities if it means finally getting a promotion.
• In the Final Fantasy series:
  • In Final Fantasy IV:
    • This happens to no end to Cecil. His best friend and comrade in arms who betrays him is actually 'named" Cain. (Kain in the original North American release, because I guess it was too obvious otherwise?). The second time it was revealed that Big Bad Golbez was his actual brother. Of course, it was revealed in the end that both were actually just being mind-controlled by The Man Behind the Man. And to drive the point home, you can not only get Kain's Lance but Abel's Lance in a bonus dungeon of the GBA version.
    • In the DS version, it is revealed that Golbez, known way back as Theodor, was compelled by Zemus to abandon his baby brother in the woods outside Baron. If you're wondering why Cecil thinks the king as his own father up until The Reveal, now you know. To be fair to Golbez, he pretty much makes up for being the Cain in the Sequel when he performs a Heroic Sacrifice. Even in the Crisis Cross Over Dissidia Final Fantasy he ends up being the game's Stealth Mentor.
  • Kuja and Zidane of Final Fantasy IX. They also have a Seth in their sister Mikoto.
  • In Final Fantasy XVI:
    • Narrowly subverted early on. Clive, who has been enslaved by the Holy Empire of Sanbreque, is ordered to assassinate Shiva's Dominant. It isn't until he's incapacitated her in combat that he realizes that the Dominant is actually Jill Warrick, his long-lost foster sister. Fortunately, Clive chooses that moment to go rogue rather than murder possibly the only remaining link to his old life.
    • After defeating Garuda, Clive learns that he himself is Ifrit's Dominant, and concludes that he killed his own brother Joshua. Of course, it's subverted when Joshua turns up very much not dead.
    • By the time the heroes reach the Crystalline Dominion, Imperial prince Dion Lesage has staged a coup and intends to assassinate the emperor, his half-brother Olivier (and his Wicked Stepmother Anabella Lesage for good measure). He is tricked into killing his father, goes berserk, has to be subdued by his maternal stepbrothers Clive and Joshua, and in the end does manage to kill Olivier.
  • Interestingly, Dissidia Final Fantasy reveals a hostile sibling relationship between Chaos and the Warrior of Light. The twist being that neither knows of the connection.
• Tons of examples in the Fire Emblem franchise.
  • In Fire Emblem: Shadow Dragon & the Blade of Light, Minerva and Michalis come to blows over the direction Macedon should go; Michalis wants a strong nation allied with Dolhr, while Minerva wants a compassionate nation allied with Altea. Amusingly averted with the two guys actually named Cain and Abel, who are both Marth's loyal grunts throughout the first game. It's actually Abel who turns on you in Fire Emblem: Mystery of the Emblem and Tokyo Mirage Sessions ♯FE, and then only because I Have Your Wife and Brainwashed and Crazy are respectively in play.
  • Fire Emblem: Genealogy of the Holy War: First the brothers of Rebel Prince Jamke are brutish pawns of a cult. Afterwards comes Andrey, the younger brother of Briggid, who killed his own father to get the title of Duke. There's also Danann, the evil brother of Mad Dictator's Handsome Son Lex. Similarly, Mad Scientist's Beautiful Daughter Tailtiu's brother Bloom took after their father. At the end of the Wham Episode, Arvis betrays and orders the executions of his own half-brother Azelle (and all of your other guys for good measure). Only one of the pair of Luchar and Lucharba can be recruited, making the non-recruited one turn against his brother. Near the end, Brian, the emancipated but super strong brother of Luchar/Lucharba, shows up for revenge. Prince Julius is the inbred vassal of Loptous who (barring Cherry Tapping) needs to be killed with Naga and wields dark magic, and he comes into conflict with both his twin sister Princess Julia who is good when she is not brainwashed and has the Naga light magic and his maternal half-brother Seliph. Yes, Genealogy of the Holy War IS creepy.
  • In Fire Emblem: Thracia 776, Olwen betrays the child-killing Loptr Empire and comes into conflict with her brother Reinhardt in the process.
  • In Fire Emblem: The Binding Blade, there's Nietzsche Wannabe King Zephiel and his much gentler half-sister, Princess Guinevere. They did not start out that way, being very close in their childhood, but after an assassination attempt by his own father, Zephiel became embittered and eventually drove his sister away.
  • Fire Emblem: Path of Radiance's Mad King Ashnard fits, what with killing all of his other siblings in order to take the Daein throne and all.
  • In Fire Emblem Fates:
    • The Avatar will always be forced to turn against one set of siblings. In Birthright s/he's the Cain to Xander, Camilla, Leo, and Elise's Abels, while in Conquest s/he's the Cain to Ryoma, Hinoka, Takumi, and Sakura's Abels. Conquest also has the ninja Kaze betraying his brother Saizo to join the Avatar; ironic because Kaze is a member of the Abel archetype while Saizo is the game's Cain archetype. Unusually, these Cains are genuinely sympathetic heroes who only betrayed their siblings as part of a Sadistic Choice. There's also a more straightforward example in Birthright, where Flora is forced by Garon to battle the Avatar and comes to blows with her sister Felicia.
    • According to support conversations, the surviving Nohrian royal siblings are the only Abels of their extended family in King Garon's Decadent Court. There used to be a lot more kids and consorts in the palace.
  • In Fire Emblem: Three Houses:
    • Miklan is the Cain to Sylvain's Abel since Sylvain was born with a Crest (and thus had the right to inherit leadership of their family), while Miklan did not. Miklan has always hated Sylvain for having what he always wanted, and the feeling is mutual due to how much shit Miklan put Sylvain through during their childhood; after Miklan turns evil, Sylvain isn't all that bothered about having to kill him. After Miklan's transformation into a Beast and his subsequent death, however, Sylvain takes some time to reevaluate his feelings and admits while he still can't forgive his brother, he can at least empathize with what led him down his path.
    • Edelgard and Dimitri are stepsiblings, but when the former's actions in the name of their ideals come to light, they have a vicious falling out and the latter spends all of Part II hounding for their blood.
    • Mercedes ends up on the opposite side of a war with her half-brother Emile a.k.a. the Death Knight. There is one specific scenario that prevents them from coming into conflict, though: recruit Mercedes to the Black Eagles and side with Edelgard at the Chapter 11 route split.
    • Gilbert's brother Baron Dominic is forced into subservience to the Adrestian Empire in Part II, and the two cross blades in Gilbert's paralogue.
    • In the backstory, Dimitri's Evil Uncle, Grand Duke Rufus, was a part of the conspiracy that killed his brother, the king.
    • In Claude's backstory, he was abused by his Almyran half-brothers. In Fire Emblem Warriors: Three Hopes, one of them (Shahid) actually attacks Leicester and serves as a recurring personal enemy to Claude.
• Galerians: Rion and, uh… Cain. The rivalry is entirely one-sided on Cain's part, since Rion has no way of knowing that a backup Rion clone was made specifically to kill him.
• Kratos actually has several of these in God of War, being a son of Zeus and all, the foremost being Ares, who tricked him into killing his wife and daughter. In only two cases, however, is the connection actually remarked upon; with Hercules, a "Well Done, Son" Guy who hopes to surpass Kratos, and Athena, who plays the role of ally, reluctant enemy, ally again, and finally Bitch in Sheep's Clothing.
• In Grandia II the main character must fight his older, more skilled, possessed brother.
• In Harvestella Gaia is the Cain and tries to kill the party, cynically believing humanity is doomed to destruction and squandering every opportunity given them. ReGaia is the Abel that helps the party, being optimistic about humanity's future and is confident that they can keep improving over time.
• Some examples in the Heroes of Might and Magic series:
  • The fathers of Morglin and Ragnar in backstory of the first game: Ragnar's father murdered Morglin's father to seize the throne, and then he left the throne to Ragnar upon his own death. It's easy to infer from Morglin's unreliable narrations that he, Morglin, had attempted to have Ragnar killed too.
  • Roland and Archibald Ironfist. Though, ultimately, neither brother is willing to go all the way: in their respective endings in Heroes II, Archibald gets Taken for Granite and Roland is imprisoned in the western tower (canonically, the first is what happened), and when next the two brothers meet, Archibald helps save Roland, taking him to Roland's wife despite knowing full well that she has every intention of executing him should she get the chance — Roland, in turn, intercedes on Archibald's behalf and gets the sentence down to exile.
• In Hi-Fi RUSH, this is eventually revealed to be a major plot point: Peppermint is Roxanne Vandelay's daughter, making Kale, the Big Bad, her older brother. Peppermint directly opposes Kale's takeover of Vandelay Technologies and leads a resistance to expose his schemes while trying to discover why Roxanne disappeared, while Kale uses propaganda to unperson Peppermint and attempts to kill her for interfering with him.
• Ros and Lazarus in I Miss the Sunrise.
• Jade Empire: Emperor Sun Kai and your mentor Sun Li. Though it turns out they're both evil, Master Li just wanted the throne for himself and trained you as a weapon against him, and he kills you once You Have Outlived Your Usefulness.
• Kameo: Elements of Power: Kalus becomes this to Kameo, who gets blinded by rage and jealousy when the later becomes heir to the throne. As the former thought it rightfully belonged to her, she forms a Big Bad Duumvirate with the troll leader, King Thorn, to take it back by force. Though it turns out Kameo is actually adopted.
• In Kid Icarus (1986), Palutena and Medusa, sister goddesses of light and darkness respectively, have this type of relationship. It's not hard to guess which one is the evil one. It's subverted in that Palutena did not kill her herself, she only turned her into a monster and banished her. The angel Pit finished the job.
• Kingdom Hearts: Birth by Sleep actually turned the relationship between Cinderella and her evil step-sisters into this. While they were very cruel to her in the films, they outright tried to murder her out of hatred with an Unversed in the game, which backfired on them spectacularly.
• Knight Bewitched: Bjalla and Strasza are siblings on opposite sides of the conflict. Bjalla is a red dragon that loves Typhus, being his concubine, and sides with him in killing humankind, Strasza is a blue dragon that leads the remains of dragon society and is trying to take Typhus down. Bjalla seems to be under some sort of control, though, as she thanks you for defeating her.
• Last Scenario has Castor and Ethan, respectively, including the age rule. However, it's pointed out that the younger of the two plays the role of an older sibling in many respects, which may make this a slight variation on the usual set-up.
• League of Legends has several pairs.
  • Kayle and Morgana are estranged joint-holders of the title of Aspect of Justice, each thinking the other is misguided at best and evil at worst.
  • Nasus and Renekton were heroic brothers until Renekton attempted Sealed Evil in a Duel on a maddened Xerath and emerged centuries later with nothing but an insane hatred for his brother.
  • Yone was Yasuo's only defender until he believed (false) accusations that his brother was a murderer; he challenged Yasuo to a duel of honor and Yasuo was forced to cut him down.
  • Vi and Jinx. Mortal enemies on opposite sides of the law, Vi a Cowboy Cop and Jinx a wacko anarchist bent on destruction, and also sisters.
• There's a sidequest in the first Mass Effect game in which Nassana Dantius, an asari diplomat on the Citadel, asks you to rescue her sister, Dahlia, from slavers. After you defeat the slavers, you find out that Dahlia was the leader of the slaver group. Who you killed. Nassana wanted Dahlia dead because having a slaver sister would possibly hamper her career. This is actually kind of funny due to the fact that her voice actress voiced Azula.
  • The second game has DLC where Shepard learns that a researcher has forced his own brother into cruel, psychologically traumatizing experiments. Even Renegade Shepard thinks this is not legit, and the paragon ending includes a paragon interrupt of Pistol Whipping the culprit!
• The Snake Brothers (okay, "Les Enfants Terribles", strictly) in the Metal Gear series. Liquid seems to enjoy the rivalry immensely. Perhaps a little too much.
  • It's no coincidence that their mother's codename is EVA. She's explicitly linked with Eve, and not only by reference to her sons — this is her on the boys' father, who at the time went by the codename Naked Snake: "But… it was I who tempted the Snake, and got away with the forbidden fruit of knowledge."
• The trailers for Modern Warfare 2 explicitly invoke the murder of Abel, with Makarov talking about the blood of those killed by the United States and the UK crying out from the earth, and noting that they cannot hear the cries because they do not come from their own soil… but they will.
• Mortal Kombat:
  • Bi-Han, the original Sub-Zero, was killed by Scorpion and resurrected as the evil revenant Noob Saibot by Quan Chi, the true author of the events that led to Scorpion's vendetta against Sub-Zero. This puts him up against his younger brother Kuai Liang, the second Sub-Zero, who also opposes Quan Chi.
  • In the first two timelines, Mileena is an Evil Twin knockoff to Kitana and wants to kill her. Averted in the new timeline ruled by Liu Kang, as Mileena has genuinely gotten Adaptational Heroism, in addition to being actually Kitana's biological sister and is in better terms with her, albeit Mileena is still Hot-Blooded, and is infected with the Tarkat disease which causes her quite a lot of issues.
  • Also in Mortal Kombat 1, again between Bi-Han (again, as Sub-Zero) and Kuai Liang (who now takes the mantle of Scorpion), this time because Bi-Han betrays and turns against Kuai Liang, cementing the former's Face–Heel Turn as well.
• In Mother 3, Lucas must fight his brother Claus, who was killed, reanimated, and brainwashed into being the Pig King's loyal minion. When Claus snaps out of it, it's too late.
• The Neverhood: Klogg and Klaymen are both creations of Hoborg, and are technically his children by extension. The villainous Klogg attempts to kill his little brother Klaymen across the story. (Admittedly, Klogg's evilness came about before Klaymen was even created.)
• Mugen and Hikari from Octopath Traveler II. Their father wants Hikari to be king, since he's sick of Ku's warmongering, and Hikari is much kinder and more peaceful than Mugen (which also makes Hikari more popular with Ku's commonfolk). As a result, Mugen kills King Jigo, takes the throne, drives Hikari out of Ku, and winds up as Hikari's final boss.
• The Shimada brothers Hanzo and Genji from Overwatch. Elder brother Hanzo is a dutiful son to his family's crime business, while the younger brother Genji is a pampered boy with no interest in crime. Then Hanzo, on the order of the clan elders after his succession, attempted to put Genji into the fold, he refused, Hanzo ended up killing him, which caused him to leave the clan in shame and attempts to redeem himself through his way. Little does he know that Genji came back as a Cyber Ninja, shut down his family business, and shows himself to Hanzo, forgiving him for his actions, but due to complicated reasons, Hanzo wasn't as accepting. Genji is a member of the Overwatch, the good guys, Hanzo right now is a neutral figure, but both still have tension against each other.
• The final bosses for Risk of Rain and Risk of Rain 2, Providence and Mithrix respectably, serve these roles toward each other. Providence is a Well-Intentioned Extremist who wants to preserve life at any cost, while Mithrix is a Mad Scientist who loves to create constructs and has a Lack of Empathy for weaker beings. When Mithrix built a teleporter one-way trip to get off the planet they were born on, Providence allowed him to step in first before destroying it, trapping him on the moon as Mithrix eventually goes mad from isolation and envy and swearing revenge. They're both eventually and separately slain by the player.
• In SaGa Frontier, there are Blue and Rouge, twins who're told to kill the other after mastering as much magic as possible. Who wins is irrelevant since they turn out to be the same person, Split at Birth.
• The obscure PC game Sanity: Aiken's Artifact feature such a storyline with someone named Cain as the protagonist and the so-called foster brother Abel as the final boss.
• Scathe zig-zags this trope where the Supreme Creator who grants you life was supposedly the Big Good, while his brother, Sacrilegious, is the Big Bad, which you're tasked to destroy. While the Bad Ending has Sacrilegious taking over your mind, you get two further endings, either submit to the Supreme Creator (who then goes into a fit of Evil Gloating before the credits role) or, should you collect enough runes, instead betray the Creator and take over his place, as the Golden Ending. It remains unconfirmed between the Creator and Sacrilegious, which is the Cain and which the Abel.
• Senran Kagura has Hyoki, who hates her sister Leo to the extent she forms Senki Shu, with the intention of harnessing the power of the Yoma to destroy the shinobi principle.
• In Soulcalibur V, Sophitia's children Patroclus and Pyrrha are driven to this thanks to being egged on by Soul Calibur and Soul Edge respectively. Fortunately, the siblings are strong enough to eventually overcome the influence of both swords for each others' sake.
  • Soulcalibur IV: Sophitia becomes the Cain to Cassandra's Abel, but not willingly because she has been Forced into Evil.
• In Starsiege, two mech pilot brothers are codenamed… Icehawk (the older, a cold-blooded by-the-book pilot who is loyal to the Emperor) and Phoenix (the younger, a prodigy pilot who has a knack for escaping from impossible situations and joins the Mars Rebellion). They are and are not actually related: Icehawk's real brother was critically injured in an accident and the Emperor secretly had his brain replaced by the organi-mechanical brain of his own son, as a way to continue his son's existence. Indeed, a hidden sect of people in the game world do this with their brains all the time, choosing children with life-threatening injuries and swapping brains with them while they're hospitalized.
• In the Knights of the Fallen Empire expansion of Star Wars: The Old Republic, Arcann killed his twin brother Thexan when he lashed out at his father Emperor Valkorian and Thexan tried to stop him. It was this act however that led to Valkorian acknowledging Arcann has his heir. His younger sister Vaylin, whom Valkorion drove Ax-Crazy in efforts to control her Force powers, pulls a Starscream on him in turn at the climax of Fallen Empire, forcing him to flee into exile; he can be recruited by the PC at the start of Knights of the Eternal Throne.
• Stella Glow has Marie as the Abel to her sister Eve, helping the party to defeat her and believing in the best of humanity. Eve tries to kill humanity and spread despair throughout rhe world, even trying to corrupt her sister into despair. Justified as Marie and Eve were created from humanity's positive and negative experiences, respectively, and if the player wishes they can have Eve make a Heel–Face Turn.
• Street Fighter IV. It's a definite shout out to the bible, a hero being named Abel, only the Cain is named Seth. It's made very obvious that Abel is a product of S.I.N. experiments like Seth, in both his Ultra Combo (Where his eyes change color to resemble Seth's), Abel's ending, and both of their win quotes against each other in Arcade Mode. According to Word of God, Seth was indeed originally going to be named Cain, but this was changed due to some other fighting game having a character with a similar name. It also helps that Seth is the name of Capcom's senior manager, Seth Killian, also known as "S-Kill". This also works for Akuma and Gouken.
• Zigzagged in Tales of the Abyss. The game is kicked off by Tear's attempt to kill her brother Van, making it seem like Tear is the Cain to Van's Abel, which is eyebrow-raising due to Tear's status as the Deuteragonist. Then Van is revealed as the Big Bad and that Tear had a very good reason for trying to kill him, making it seem like Tear is the Abel to Van's Cain. As more about Van's goals are revealed, it's discovered that while Van is determined to destroy the world, he is also desperate to keep Tear alive if at all possible, settling the situation on a heroic Cain going up against a villainous Abel. Then, by the end of the game, Tear has experienced Character Development and makes one last attempt to convince Van to settle things peacefully, while Van declares that he will no longer hold back, even against her, reversing the situation one more time into Tear being the Abel to Van's Cain.
• Redmond and Blutarch Mann from Team Fortress 2, to the point that not even death can stop the rivalry between them; when they're both killed by their long-lost brother Gray Mann in the comic prologue to the Mann vs. Machine update, their ghosts later hire the mercs to send the other brother's corpse to Hell so they can legally be the winner of the war between them as part of the 2013 Halloween event.
• In the fashion of the Tekkaman Blade example, Super Robot Wars Compact 3 gives us sworn brothers Folka Albark (the elder, main protagonist) and Fernando Albark (the younger rival). Then there's their older brother Altis Tarl, also on the enemy's side. Subverted because Fernando and Altis are not outright evil, they're just Folka's enemies on circumstances.
  • The first Original Generation game has brothers Raideisse and Elzam Branstien fighting for the first half of the story. Mostly because they happen to be on opposite sides of a war, but it also brings out a measure of animosity, mostly on Rai's part, over the death of Elzam's wife (long story), whom it's suggested Rai was in love with.
  • In Super Robot Wars NEO, Amane Inaba when possessed by Larva is the Cain and Kakeru Inaba is the Abel.
• Tekken has Nina and Anna Williams.
  • Kazuya Mishima and Lee Chaolan fit this trope as well since technically Lee is Heihachi's son through adoption.
  • Likewise with Kazuya and Lars, since Lars is the son of Heihachi and a Swedish mistress.
• Jacky and Sarah Bryant from Virtua Fighter had to go through this. In the first two tournaments, J6 brainwashed her and had her try to kill her brother. After she was freed from their control, her motivation for joining recent tournaments was to fight and defeat her brother, not knowing this is all part of J6's plot.
• In the Warcraft universe, night elf twin brothers Illidan and Malfurion Stormrage are Cain & Abel respectively. Illidan became a demon literally due to his consuming the power of the Skull of Gul'Dan and figuratively due to his addiction to magic. That said, Illidan never attempted (at least intentionally) to kill his brother.
  • His jealousy over priestess Tyrande Whisperwind choosing his brother over him was actually the plot point that fixed their 10,000-year-old feud. Events spanning throughout the third game and its expansion culminate in the brothers teaming up to save Tyrande and making up before Illidan leaves Ashenvale (for reasons not revolving around the Night Elves).
  • In the Backstory, Darion (Abel) and Renault (Cain) Mograine become this, fueled by their father's perceived Parental Favoritism toward Darion. Though Renault turned his ire on Dad first.
  • In World of Warcraft, this happens with Krenna and Gorgonna in Conquest Hold. Krenna, the commander, wants to wage war on the alliance, and the more reasonable Gorgonna doesn't want it to happen. In the last quest in the chain, you fight alongside Gorgonna against Krenna and her bodyguards, killing Krenna and allowing her to take command. Despite the fact that she knew killing her was necessary, Gorgonna mourns the loss of her sister.
  • During the events of Wolfheart, Jarod Shadowsong (Abel) and his sister Maiev (Cain). Near the end of the novel, they had a bloody confrontation when he had discovered she had captured and planned to kill Malfurion Stormrage; he couldn't bring himself to kill her and she fled.
  • Based on a line of dialogue from the finale of the Sunwell Plateau raid, possibly Velen (Abel) and Kil'jaeden (Cain). Noteworthy in that this particular rivalry has had repercussions affecting the inhabitants of many planets.
• The ridiculously gory and difficult adventure game Waxworks (1992) was built around this concept. Your family was cursed so that one of every set of twins becomes evil, and you have to go back in time using the titular waxworks building to kill the worst of them and break the curse. Your own brother is incapacitated before and throughout the game, and part of your goal is to save him, but other than this, the "evil twin" aspect isn't played up much: the evil brothers of the past include Jack the Ripper, a necromancer who looks far older than his good twin, and a human/fungus mutant who doesn't even resemble a human anymore. That is, until The Reveal that you were the evil twin all along.
• Xenogears has a character named Abel, and a character named Cain. Cain was (indirectly) the one who killed Abel. That's about where the similarities end.

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