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* In ''Anime/AldnoahZero'', a flashback reveals Lt. Marito shot and killed his friend and fellow soldier Humeray at his request, as he was trapped in his tank and was burning alive. This is explained to be the cause Marito's PTSD, as well as Captain Magbaredge's initially hostility towards the Lieutenant. (Magbaredge is revealed to be Humeray's younger sister.)

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* In ''Anime/AldnoahZero'', a flashback reveals Lt. Marito shot and killed his friend and fellow soldier Humeray at his request, as he was trapped in his tank and was burning alive. This is explained to be the cause of Marito's PTSD, as well as Captain Magbaredge's initially hostility towards the Lieutenant. (Magbaredge is revealed to be Humeray's younger sister.)


** It's also the real motivation of why she and her father to [[DeathSeeker kill monsters]] that threaten their country. Aside of their duty to keep it safe.

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** It's also the real motivation of why she and her father to they [[DeathSeeker kill monsters]] that threaten their country. Aside of their duty to keep it safe.

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** It's also the real motivation of why she and her father to [[DeathSeeker kill monsters]] that threaten their country. Aside of their duty to keep it safe.

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* In ''Manga/SevenSeeds'', Gengoro sees it as his duty to kill all the animals he had previously taken care of in Animal Class, after they had been let loose in nature where they are confused, perhaps with stunted survival instincts or were flat out infected with rabies. Especially hard was Gengoro killing the tiger Tango, whom he had practically raised.
* In ''Anime/AldnoahZero'', a flashback reveals Lt. Marito shot and killed his friend and fellow soldier Humeray at his request, as he was trapped in his tank and was burning alive. This is explained to be the cause Marito's PTSD, as well as Captain Magbaredge's initially hostility towards the Lieutenant. (Magbaredge is revealed to be Humeray's younger sister.)
* In the anime series spinoff of ''VideoGame/ArcTheLad'', the hero Elk encounters his long lost childhood friend, changed into a barely sentient womb for the terrible monsters the bad guys are using as mooks. He strangles her to end her suffering.
* ''Manga/AttackOnTitan'' deals with this on several occasions, primarily with people considering the option when faced with being devoured by Titans.
** The ritualized inheritance of the Titan powers combines this with elements of a HumanSacrifice. When a previous holder begins dying from the [[YourDaysAreNumbered Curse of Ymir]], a successor is chosen to kill them and inherit their powers. A flashback shows that by the time Uri Reiss passed on his powers to his niece, he had begun to waste away from the Curse.
** When they are reunited after the 4-year TimeSkip, Reiner begs Eren to kill him rather than continue living with the trauma and guilt of his actions. Eren refuses to do so, expressing sympathy for his former comrade.
* At the end of ''Manga/BlackButler'''s CircusOfFear arc, Ciel orders the destruction of the villain's lair, including all the surviving children whose minds have been broken.
* Manga/BlackJack's rival, Dr. Kiriko, is a physician whose medical practice consists entirely of euthanasia. This is due to his nihilistic outlook, developed as a military doctor, which stipulates that resisting death is an exercise in futility.
* Killy destroying the eternal cloning machine and it's sole occupant in ''Manga/{{Blame}}'' could be viewed as a mercy kill.
* In ''Anime/{{Canaan}}'', Alphard has Liang Qi killed after she goes into a full mental breakdown that concludes with her trying to give herself synesthesia and suffering a SuperPowerMeltdown... sort of.
* Towards the end of ''Manga/ChronoCrusade'', Fiore offers to do this for Satella after she's badly wounded in a battle with each other (the alternative being to leave her to be killed by the feral demons they're surrounded by). Satella TakesAThirdOption and uses her "jewel witch" powers to freeze them both in crystal.
* Routinely done in ''Manga/{{Claymore}}'' when a titular Claymore exceeds their Yoki limit and [[TheCorruption transforms into a Youma]]. They are then typically beheaded by another Claymore out of mercy [[DyingAsYourself while some of their humanity is still intact]].
* ''Anime/CodeGeass'':
** After Lelouch [[PowerIncontinence accidentally]] [[MindControl forces]] princess [[{{Pacifist}} Euphemia]] [[NiceJobBreakingItHero to go against everything she stood for]] and begin killing Japanese people [[BrainwashedAndCrazy under a geass]], he exits his mecha to deliver the killing shot personally.
** CC does this to Mao in an earlier episode after Mao had just been rendered unable to ever speak again, using the closest thing to an InstantDeathBullet ever seen in the series.
* ''Manga/DailyLifeWithMonsterGirl'' includes a surprisingly lighthearted variation: In one chapter, a [[HeadlessHorseman Dullahan]] becomes friends with a terminally ill girl at a hospital and doesn't know how to cope with her impending death. Her solution? [[spoiler: Kill her... and re-animate her as a zombie, as in this setting [[OurZombiesAreDifferent zombies are fully sentient and are basically just humans with a few biological quirks]].]]
* This is one way to view Light's death in ''Manga/DeathNote''. Only in the anime, though; in the manga, it's made clear that Ryuk has gotten bored.
* In ''Manga/DetectiveConan'', one case has the culprit Ryouta Shimizu kill his girlfriend and partner in crime Fumie Ozawa because [[TakingTheHeat she took the blame of the embezzling acts they both committed by herself]] and he didn't want to see her in prison for the rest of her life.
* ''Manga/{{Dokuro}}'': Takeo does this a few times.
* At the end of ''Manga/ElfenLied'':
--> [[spoiler:'''Kouta:''' [[TearJerker And then, I killed Nyuu.]] ]]
* In the last episode of ''Literature/FromTheNewWorld'', [[spoiler: Saki does this to Squeala/Yakomaru after he's sentenced to a FateWorseThanDeath and she realizes he is technically human]].
* ''Manga/FullmetalAlchemist'':
** NobleDemon Scar does this to Nina Tucker, whose father had transmuted both her and her dog Alexander into a pitiful chimera. His comments beforehand make it clear he does this not out of disgust for Nina herself, but rather because he pitied her and thought that death was a kindness for her.
** In order to escape from Gluttony's stomach, Ed has to use some of the souls attached onto Envy in order to open the gate. One of them even thanks Ed for being put out of his misery.
* ''Manga/FushigiYuugi'':
** This is truth behind Takiko Okuda aka Genbu no Miko's death in the original ''Manga/FushigiYuugi'': Miaka's brother Keisuke and his best friend Tetsuya found out that Mr. Okuda [[OffingTheOffspring killed her]] to stop her being devoured by Genbu and [[MurderSuicide then killed himself]]. ''Manga/FushigiYuugiGenbuKaiden'' shows how it happened towards the end - Takiko was already [[IncurableCoughOfDeath dying from tuberculosis]] as well as being devoured after summoning Genbu, so Mr Okuda bonds their lives together [[note]](he was holding the ''Universe of the Four Gods'' magic book in his hands, and Takiko was inside the world of the book)[[/note]] and commits suicide to ease her suffering. Takiko explains this to her Senshi as she lays dying and has no bitterness towards [[ParentsAsPeople her father]], as she says he wanted to help her.
** Averted in ''Manga/FushigiYuugiByakkoIbun'', where Reipin begs her OnlyFriend Nirusha to kill her and use her bones in his protective charms after she both reveals herself to be a ShapeShifter and [[WhereIWasBornAndRazed destroys her village]]. Nirusha refuses and tells her that she's a human, and she returns to her human form in tears.
* In ''Anime/GareiZero'', Kagura kills her surrogate sister Yomi after the latter is possessed by a cursed stone.
* A variation in ''Manga/{{Gintama}}'' where Hijikata grants one to the dying and disgraced [[spoiler: Ito]] who had [[spoiler: betrayed the Shinsengumi]] in the form of a duel so that the latter could die honorably instead of dying alone [[spoiler: as a traitor from bullet wounds.]]
* In ''LightNovel/GoblinSlayer'', the Rookie Mage is stabbed in the stomach by a goblin knife, one infected with a poison. Her suffering is so great that she asks the Goblin Slayer to kill her. He obliges with a small blade to her neck. All of this takes place in the first episode, [[EstablishingSeriesMoment to let the viewer know what they're in for]].
* In ''Manga/{{Hellsing}}'', when a human is turned into a ghoul, there is no turning them back, so the Hellsing organization agrees that it's best to take them out quickly as a mercy kill.
* [[spoiler: Shapor]] in ''Literature/TheHeroicLegendOfArslan'' is captured by Lusitanian soldiers and will be brutally tortured to death as part of the psychological warfare for the sieged capital city. He begs his allies to end of his life as he would rather die at the hands of a friend. [[EstablishingCharacterMoment Soon-to-be-revealed character Grieve is the one to makes the shot]].
* At least Twice in ''Manga/HighSchoolOfTheDead''. The first time, Hisashi wasn't killed until after he turned (despite asking to be killed so he wouldn't, and Takashi considers this as his personal MoralEventHorizon crossing), but the second time went over without a hitch.
* Subverted in ''Manga/HunterXHunter'''s first anime adaptation. Killua wants to mercy kill a bear cub that was mortally injured by a sniper, thinking that there's nothing they can do to for the baby, but when he's going straight for the kill Gon's aunt Mito [[TakingTheBullet extends her hand and blocks the lethal blow]]. She then convinces Killua to not do it, saying the cub hasn't given up on life, and Gon convinces Killua to heal the cub through Nen. They do; the baby is soon saved and returns to his family.
* ''Anime/IlSolePenetraLeIllusioni'': This is basically the role of Elemental Tarot users. The magical girls have no way to purify the Daemonia-possessed humans, so they have no choice but to kill the human to destroy the Daemonia. Protagonist Akari's first kill was her own cousin Fuyuna, who was unknowingly infected by a Daemonia.
* In ''Anime/{{K}}'', [[spoiler: Reisi]] is forced to do this to [[spoiler: Mikoto]] to prevent the latter's SwordOfDamocles from falling and kill thousands of innocent people.
* In ''Manga/KingOfThorn'', Ron decides to mercy kill the child Tim, believing there is no hope of rescue and that a quick death by bullet is better than being eaten by monsters or [[TakenForGranite petrified]] by Medusa. [[MamaBear Katherine]] isn't ready to give up hope, however, and just barely manages to prevent him from shooting the boy. Tim, asleep, doesn't even realize what almost happened.
* In ''LightNovel/JuuniTaisen'', this happens more than once and always in relation to [[{{Necromancer}} Rabbit's]] powers. Ox performs a mercy kill at the request of Tiger, to prevent her from becoming one of Rabbit's zombie minions, and is later himself killed by Rat to escape the same fate. A flashback later reveals that Monkey requested that Rat do this, if she were going to be killed by Rabbit. The information she gave him allows him to finish off the zombies of Rabbit and Monkey once and for all.
* In the anime version of ''Manga/LinebarrelsOfIron'', KATO-KIKAN member Nakajima Soubi, after his defeat at the hands of [[TheHero Hayase Kouichi]], is revived by the real Big Bad and used as part of its invasion force of [[YouWillBeAssimilated hive-minded man-machines]]. In a final act of clarity, during the actual invasion of Earth, he asks his former teammates [[DyingAsYourself to put him down while he retains the lest vestiges of his consciousness]]. They comply.
* Franchise/{{Gundam}}
** ''Anime/MobileSuitGundam0083StardustMemory'': A Zeon soldier, disgusted at the sight of a Zaku painted white and used by the Federation, resolves to give it a "mercy killing".
** In ''Anime/MobileSuitGundamWingEndlessWaltz'', Heero offers this to the critically injured [[spoiler:Mariemaia]] after the final battle. When he pulls the trigger, [[spoiler:it is revealed that he is out of ammo.]]
** In ''Anime/MobileSuitGundamIronBloodedOrphans'', Crank Zent, after failing a duel in order to spare his subordinates from carrying the burden of a failed mission, asks his opponent Mikazuki Augus to put him out of his misery [[ICannotSelfTerminate because he was stuck and cannot kill himself]]. Knowing that Crank was wanting to die, Mika obliged and delivered a Mercy Kill after shielding Atra's lucky charm from the gunshot. This, however, becomes the [[StartOfDarkness driving force]] of [[RevengeBeforeReason Ein Dalton's grudge towards Tekkadan]].
* Reg in ''Manga/MadeInAbyss'' eradicates [[spoiler:Mitty]] at [[spoiler:Nanachi's]] request due to the character's [[AndIMustScream situation]] from having been forced to ascend the Abyss's sixth layer.
* In ''LightNovel/MuvLuvAlternativeTotalEclipse'', [[spoiler: Kazusa]] is trapped and being swarmed by BETA, and begs to be killed by gunshot before she can be EatenAlive. [[spoiler: The trope is averted. Yui empties her gun trying to comply, only to miss every single shot. Kazusa remains visibly alive, jostled as her body is eaten free of the wreckage. She doesn't die until they finally tear her disemboweled upper half out of it.]]
* Certainly Tsunayoshi viewed her death at the hands of [[spoiler: Yoshiyasu]] as this in ''Manga/{{Ooku}}: The Inner Chambers'': she had long believed that she became TheWrongfulHeirToTheThrone and would welcome someone to kill her. It's unclear though if [[spoiler: Yoshiyasu]] killed her to fulfill this trope or if [[WomanScorned another trope]] motivated her murder.
* ''Anime/PuellaMagiMadokaMagica'':
** Kyouko sacrifices herself to kill Sayaka after Sayaka turns into a witch.
** In one of the attempts for Homura to SetRightWhatOnceWentWrong, she's forced to shoot Madoka before she can turn into a witch. Earlier that same timeline, Mami does this to Kyouko after [[GoMadFromTheRevelation realizing]] what's going to [[AFateWorseThanDeath happen]] [[TheCorruption to them]]. She was going to do this to Madoka, Homura, [[DrivenToSuicide and herself]]. The only reason she doesn't succeed is that Madoka does it to her first.
** In a way, dying from battling a witch and getting your soul gem destroyed seems like a fate much kinder than turning into one. In fact, this is what the [[MonsterOfTheWeek witches]] are trying to do by killing humans -- sparing them from a life of slavery to the [[AliensAreBastards Incubators]].
** Madoka does this ''in a world wide scale'' in the GrandFinale. Her wish says that she wants witches to not exist anymore, so she spreads her power all over the world helping magical girls in need. In the case of magical girls whose Soul Gems are completely corrupted so they're about to become Witches, she can't save their lives, but at least she can make sure they'll die painlessly and peacefully while their energy is collected to save the world. (This includes Sayaka, who can pass on in peace now.) And in a sense, she also does this ''to herself'': since she's destined to become the most powerful witch right after becoming a magical girl, Madoka ends up erasing herself outta existence when done, after a last talk with Homura.
* Attempted in ''Manga/RosarioToVampire'', where Tsukune became a ghoul. Thankfully, Moka was stopped before she could land the finisher.
* This almost occurred in ''Manga/SchoolLive'' when [[spoiler:Kurumi]] was bit by [[spoiler:a zombified Megu-nee.]] Her friend [[spoiler:Rii]] was panicking over the prospect of having to kill her [[spoiler:however Miki came just in time with the MagicAntidote.]]
* In ''Anime/SpeedGrapher'', Suitengu did this to his little sister, Yui, after discovering that years of abuse and degradation in a brothel had destroyed her mind.
* ''Manga/StreetFighterIITheManga'' has this happen with Charlie, who was one of Bison's first test subjects and went insane from the Doll drug. Guile intercepted him as Charlie was attacking unarmed villagers, and was forced to kill his best friend to prevent more lives from being endangered.
* In ''Manga/VinlandSaga'' Askeladd tries as such for his fatally wounded friend Bjorn but he screws up the blow, missing the man's vitals. He rectifies this mistake shortly after a few last words between himself and Bjorn.
** After another failed assault on London, a viking is walking through the camp with the wounded, asking if [[{{Seppuku}} anyone needs a finishing blow]] to both die less painfully ''and'', according to their beliefs, go to WarriorHeaven. One warrior in the picture is even calling over to him to take up his kind offer.
** [[spoiler:Askeladd himself offers to let Thorfinn Mercy Kill him after he's stabbed fatally by Canute, more for Thorfinn's benefit than his own since he knows he's bleeding out anyway. Thorfinn is too messed up to do it.]]
* It's a sign she's all grown up when ''Anime/WitchHunterRobin'' delivers a Mercy Kill to the witches being [[PoweredByAForsakenChild "processed"]] into [[PowerNullifier Orbo]].
* This happens to [[spoiler:Hige]] in ''Manga/WolfsRain''.
* When he was sent to Earth, Manga/JacoTheGalacticPatrolman had specific orders to use an Extinction Bomb, an artificial plague that would wipe out every form of life on the planet, if it turned out the alien he was sent to kill was an adult and thus too strong for him, as mankind would have been annihilated anyway but the effects of the Extinction Bomb would have been much quicker and less terrible. The moment he identifies the alien as [[spoiler:[[Franchise/DragonBall a Saiyan from Planet Vegeta]]]], the reader understands that his orders were fully justified.

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