"Lafrenze, don't forget. You are the last guardian of the door that protects this world from the dead that dwell in Hades. You cannot ever break the barrier of purity."Sometimes the Damsel in Distress isn't just a pretty and helpless Love Interest in need of rescuing; sometimes she's also a vital support beam for the continuing existence of a safe and happy world. Kinda makes dating awkward. Much like a Virgin Powered Containment Field to a nasty Sealed Evil in a Can, the Fisher King (well, queen) of a kingdom, or a human Cosmic Keystone that makes sure the sun rises each morning, the heroes' Woobie is responsible for maintaining the Balance Between Good and Evil firmly in the Ghibli Hills side as opposed to Mordor. Of course, this makes them the target of so many kidnapping plots even the parodies have become a Dead Horse Trope. Note that just plain killing the Barrier Maiden is rarely an option — either the villain becomes infatuated with her or he wants to Break the Cutie to The Dark Side and turn her into an Apocalypse Maiden, or there's a complex Black Magic ritual needed before he can destroy or steal her power, or simply killing will just make her reincarnate elsewhere... the list goes on and on. The life of a poor Barrier Maiden is pretty sucky to boot (even more so than for a superhero's kid). She's usually treated as a MacGuffin instead of a person, is expected to make a Heroic Sacrifice if victory is on the line, and is usually chained to a temple or altar as part of her duties. As a job, maintaining the Containment Field or being a Cosmic Keystone usually isn't pleasant either: if the evil is becoming stronger or the Eldritch Abomination is weakening reality, she might end up dying either holding up the roof or when the barrier breaks. Expect the Barrier Maiden to be a White Magician Girl, All-Loving Hero or The Pollyanna. Male examples are pretty uncommon, but Atlas at least is a good one, making this Older Than Feudalism. See also MacGuffin Super Person. Conditioned to Accept Horror could sometimes overlap. Not to be confused with the Barrier Warrior, but they may occasionally overlap. Also not to be confused with a Maiden Barrier, which can also make dating awkward. Compare with Load-Bearing Boss. Contrast Apocalypse Maiden.
— "The Witch and Lafrenze", Elysion
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Anime and Manga
- Yuri Suzuki from Anatolia Story starts as this, since she's thrust into the Hitite Empire because Queen Nakia needs her blood to perform a curse she wants to cast on other kingdoms. She soon decides to fight back, however, and soon finds herself as the biggest danger to Nakia's evil plans.
- Bleach: Rare male version; the Soul King is the lynchpin of existence. If he dies, Soul Society, Hueco Mundo, the World of the Living, and everything else, will fade into oblivion. In 616, after the Soul King is "killed" in VERY messy circumstances and the world begins to collapse and fade... Captain Junshirou Ukitake uses the powers of a Living Shadow that had been keeping him alive since childhood to replace the Soul King's missing limbs, essentially turning himself into this.
- Blue Comet SPT Layzner gives us Julia Asuka/Albatro Mille, the local Mystical Waif and older sister of The Hero Eiji Asuka/Albatro Null. As the series advances, she takes up this role as well as those of: the "Holy Maiden" who works for peace in a ravaged Earth conquered by the Gradosian Empire , one of the few people who know the truth behind both Grados and Earth, and the only one who can handle the Seal of Grados.
- Played with in Blue Exorcist, where Ryūji "Bon" Suguro is a male example of this during the battle against the Impure King. His protector/companion Rin mockingly calls him "Princess" for the duration of the fight.
- The anime Blue Seed has Momiji, a girl from a family line whose daughters, descended from the legendary Princess Kushinada, must ritually sacrifice themselves (or not) to seal the dreaded Orochi from rising again. Things were fine until twin girls (the aforementioned Momiji Fujimiya and her older twin Kaede Kunikida) were born, "splitting" the bloodline and rousing the demon. Of course, it doesn't help that Kaede, who is as powerful as Momiji but much more knowledgeable as well as very embittered, has come to the conclusion that Utopia Justifies the Means.
- For a sci-fi franchise, Gundam has several:
- Maria Armonia from Victory Gundam, a powerful holy woman with Healing Hands and the puppet ruler of the Zanscare, as well as the Newtype in charge of the Mind Rape device known as the Angel Halo. And later we meet another: Shakti Kareen...Maria's long-lost daughter, with exactly the same abilities.
- One example per gender: Kyouji Kasshu and later Rain Mikamura from Mobile Fighter G Gundam, due to being forcibly made the "Core Units" of the Devil Gundam with "help" from the DG-Cells invading their bodies. Rain got better... Kyouji did not.
- Lucille Lilliant from Gundam X, who's put into a forced coma and locked inside a capsule for 15 years. A whole arc is about her using the last remains of her powers to contact Jamil, her former pupil, through Tiffa's body so they can thwart the enemies' plans to capture her.
- Yurin L'Ciel from Mobile Suit Gundam AGE. Due to her Psychic Powers, when the Veigans get a hold of her, they strap her to a MS cockpit and force her to become a living amplifier for Desil's own powers as he fights Flit, the boy that poor Yurin loves.
- A certain character in Haruhi Suzumiya is a barrier for herself; if she gets in a bad mood, or discovers her own volatile abilities, she's likely to erase the entire Universe (while not even being aware that she'll do so). No one is sure what would happen if she died, but she seems to have created the current universe three years ago and made herself its God, so it probably wouldn't be good.
- Shiori from InuYasha is a little girl who is half-bat demon and half-human, and as such she has powers like this. She can use her energy to power up the Blood Coral Crystal belonging to the bat demons, and also use it to create Deflector Shields. This presents quite the problem for Inuyasha, who both has some empathy for her plight since he is a half-demon too and will have to kill her to get a power upgrade for his Cool Sword Tetsusaiga. It's solved more peacefully when Shiori, having been released from her abusive grandfather's control, willingly gives him the power he needs.
- The title character in the manga version of Karin. Karin turns out to not just be a "blood creator", but a special kind of vampire named "Spirit of Psyche" that is born when the vampire species is struggling, so the blood Karin produces can bestow fertility in other vampires. Therefore, she's kidnapped by the Brownlick clan, which intends to first have the poor girl raped and forcibly impregnated so there will be more Psyche Vampires around, then feed from her blood to rejuvenate themselves — even when that's almost invariably going to kill her.
- Ulrike and Ondine from Kyo Kara Maoh!; being stuck in the same building for 800 years without cable would be torture.
- In Magic Knight Rayearth this is part of the job description of the Pillar of Cephiro, and is the factor that drives the Backstory and underlying plot.
- There is a bit of a subversion here, as the solution to the problem is in fact killing the barrier maiden. She summoned the heroes intending that they should kill her. The whole thing is deconstructed - being the one who sustains the world with sheer force of will means you can do pretty much nothing else with your life. Simply ''wanting something more'' constitutes enough distraction to start the world's descent into disarry. Since it can only be passed down by the death of the old pillar, and her protection spell comes with the loophole that she cannot be slain by any hand ''from Cephiro,'' it turns out our heroes are summoned from Earth to put her out of her misery so another can become Pillar and save the world. Most "villains" were actually trying to SaveThePrincess.
- Mahou Sensei Negima!:
- Asuna Kagurazaka , mixing it with Action Girl.
- Konoka Konoe sorta was an unnoficial one in the Kyoto arc, which gets her kidnapped by a rival mage group who want to use her still not-awakened powers to unseal a massive demon. They fail and Konoka is rescued by Negi, Asuna and Setsuna.
- Naruto's mother Kushina Uzumaki. She was the former host of the Nine-Tailed Fox, and later the seal keeping him inside Naruto was made of her chakra. She's also the rare Barrier Maiden who mixes this is Action Girl, since she was in a Battle Couple with her husband Minato aka the fourth Hokage and Naruto's father.
- If Kushina is one of these, then so is Mito Uzumaki, her Old Master as well as the first Kyuubi host.
- A sort-of unofficial example is Anko Mitarashi. After defeating her in battle, Kabuto spares her...only to keep her prisoner and barely alive, to slowly absorb Anko's chakra so he can get all of Orochimaru's power, coming from her Cursed Seal.
- It's later revealed that Kakashi's friend and partner Rin Nohara was forcibly turned into one, having the Three Tails Beast sealed into her so she'd go the Tragic Monster way and destroy Konoha. She averted this via throwing herself in front of Kakashi and letting him impale her, dying to save the village and escape this trope. Bad thing, she didn't know that her and Kakashi's other friend and partner Obito Uchiha wasn't exactly dead as they believed, and saw everything...
- In The Place Promised in Our Early Days, Sayuri ends up in a coma, which somehow prevents the giant tower from overwriting the world with part of a parallel universe. Destroying the tower might leave her in a coma forever, but waking her up could end the world (literally), so naturally they decide to do both.
- The jewels inside the magical girls of Rakugo Tennyo Oyui are also what enforce the barrier around Edo. As far as barrier maidens go, though, they're pretty active in the field.
- Modern-day high-tech example: Chise from Saikano is the ultimate weapon on whose shoulders the fate of Japan depends...and the invasion is underway. When she tries to take time out for dating, lots of people die. Which doesn't even begin to cover it, in the end....
- Sailor Moon
- It sorta happens in the R season. After Neo Queen Serenity takes the bullet for Chibi-Usa and is put out of commission, the four Inner Senshi of Crystal Tokyo place her in a Crystal Prison and then gather themselves in the center of the city, casting a protective barrier over it that comes from what remains of their powers. When Wiseman is defeated, Chibi-Usa returns to the newly healed Cystal Tokyo and both the Queen the Senshi are fine.
- In the S season the Inners pull a similar stunt to create another barrier that will let them keep Pharaoh 90 and their minions confined to the surroundings of Mugen Gakuen, as Moon and the Outers fight Mistress 9. Said barrier breaks at a critical moment, the place almost collapses and the Inners barely survive, but manage to send out the remains of their energy to Moon so she can become Super Sailor Moon without the recently destroyed Grail.
- Saori Kido aka Athena from Saint Seiya frequently stood in this position. Notably in the Asgard (anime only) and Poseidon arcs, she uses her goddess' powers to delay Princess Hilda and Poseidon from flooding the planet and killing humanity. The effort was usually such a strain on her that it was a race against the clock for the saints to battle their enemies before time ran out and Saori died.
- As Saori's expy and predecessor from the 18th Century, Sasha aka the Athena from Saint Seiya: The Lost Canvas' is this as well. Before the rosary that seals the Specters' souls is created, Athena herself sustains a barrier that prevents them to be resurrected. She later manages to upgrade to Lady of War.
- Reversed in Slayers Next. Lina Inverse is the only person who can destroy the world...but she's actually a Black Magician Girl. The bad guys spend most of the season pissing her off for just this reason.
- In Soul Eater the Shinigami sealed himself to the ground of what became Death City in order to imprison the first Kishin, Asura. 800 years later, Asura gets out thanks to Medusa's Magnificent Bitch credentials, leaving Shinigami unable to reach him. The anime, however, finds a way around that. In the manga, Asura is re-sealed with Crona as the new guardian. Unlike Shinigami, this seal is on the moon, which is even more secure, but leaves Crona no one to keep company with in the meantime. Though, Maka and Crona did say they'd meet again. As to how...
- Sharak Sanzo of Saiyuki Reload Blast uses her Kouten Sutra to make the villages around her invisible, thus protecting them from Youkai attack.
- In Star Driver this is a main focal point for the plot. The reason that the Humongous Mecha don't show up in the middle of the island is because there are four maidens that contain seals to keep them in Zero Time; the bad guys want to break the seals so they can use the devastating weapons in reality. The show starts right after the villains have broken the first seal. THE BM here is Wako Agemaki, one of the Maidens, who gets trapped in a force-field bubble whenever the fights start. That's not being snarky; that is literally how it works. Poor Wako!
- Kurogane's mother from Tsubasa -RESERVoir CHRoNiCLE- was one of these. She was the miko to the local shrine which maintained the barriers keeping the demons at bay, and she was assassinated by Fei Wong Reed at a critical moment, resulting in the collapse of the barriers and the utter destruction of Kurogane's homeland, with himself as the Sole Survivor.
- The king of the Catacombs in Undertaker Riddle. As holder of the Twilight's key, an inmense power able to created or destroy worlds, the king use it to protect the Catacombs of soul between the human world and the afterlife. Faust is the current king while Hayato is her expected succesor.
- Sayaka Mine from Yaiba. More exactly, she's a descendant of Taro Urashima and Otohime: that marks her as the "Dragon Maiden", the Priestess of Ryujin and the key to unleash Princess Kaguya's true form. And uncommonly for this kind of story, Kaguya does manage not only to capture poor Sayaka, but to absorb her Life Energy to unlock her big form; Sayaka survives but he body is drained to the point of rapid aging, and she doesn't recover until Yaiba defeats Kaguya.
- Kotori Monou from X/1999, who unbeknownst to her is one of the keys to the world's doom or salvation. She ends up dying at the hands of her Face Heel Turned brother Fuuma.
- The Key Guardian in Thorgal is a mortal who has been entrusted by the gods in the task of guarding the passages between the worlds.
- An issue of the Buffy the Vampire Slayer, Season Eight comic features a young woman performing this task for a demonic house and not feeling at all well thereby. The character was based on a mentally ill fan, who evidently liked it.
- Fantastic Five, a what-if future continuity of the Fantastic Four, sets Sue Richards up as one in a quite literal sense. It's used as a surprise twist: A massive rift in space-time was just about to tear a few dimensions wide open. Sue was critically injured trying to close it. So, as her final request, Sue's comatose body is suspended in a massive generating machine, on a space platform in interdimensional space, so her force field powers can keep the rift from breaking loose and destroying the universe. Reed stays with her in a lonely vigil, continuing his work for the Five on Earth through remote-controlled proxy robots that the group claims are cyborgs.
- In "Wednesday's Child" in Plop! #14 the Castle of Merlin has a room containing a crying woman who's spent the last ten million years floating in front of the portal between heaven and hell while demons try to pull her in by her foot. If she's ever removed, the demons will be free to cross over into the mortal world.
- The five mages from Terrenos in Birthright are interdimensional magic users who fled their world after a Hopeless War against the Evil Overlord that ruled the place. To prevent their enemy from finding and conquering Earth, they created a magic spell that prevented travels between worlds and their lives powered the barrier, if they were to die then Earth would be doomed to conquest at the hands of this evil. The main protagonist is the dark lord's enforcer with the power to walk between dimensions and is sent on a mission to kill the mages so his master can conquer Earth just like he did Terrenos.
- The Hiiragi twins in Stars Above are these for The Multiverse. Kagami also happens to be an Apocalypse Maiden... her body contains a Demon that could destroy all realities if it ever gets out.
- In Shadowchasers Series, Tharizdun is a villainous example. The gods dare not kill him, despite the potential genocidal cataclysm he would attempt to start if he was freed from his prison; killing him would allow the Great Old Ones to reclaim the power they invested when they turned him into their Unwitting Pawn, potentially resulting in them releasing a far more dangerous threat.
- Sunset Shimmer ends up taking this role in the Oversaturated World. Unlike most examples, she's definitely not distant or helpless, and immediately takes steps to not only spread her duties around but also ensure she (a) will remain grounded in the real world and (b) won't have to do her job forever.
- The Care Bears lost episode Creepypasta The Things Without Feelings implies that Grumpy Bear is this, forever shielding Care-A-Lot from a group of horrific Eldritch Abominations that nearly destroyed it and implicitly made everyone Go Mad from the Revelation; this is implied to be the reason why Grumpy never changes whenever the show reboots...as well as why he's so grumpy.
Films — Animated
- In South Park: Bigger, Longer & Uncut, Terrance and Phillip are the only two people preventing the apocalypse from being brought about.
Films — Live-Action
- The protagonist of The Sentinel (not the television show) becomes one such at the end of the movie, guarding the literal Gates of Hell (she partially qualified by being a failed suicide).
- Leeloo from The Fifth Element is another example of this.
- The main character from The Golden Child is a rare male example.
- X-Men Film Series:
- X-Men: Days of Future Past: Dr. Bolivar Trask is a male example. His murder by Mystique will generate a Crapsack World where mutants and humans who are carriers of the X-gene are slaughtered en masse, leaving only the worst of humanity in charge.
- X-Men: Apocalypse: Gender-flipped with Professor Charles Xavier. The death of his mind through Apocalypse's commandeering of his body will prompt The End of the World as We Know It where weaker individuals across the globe are swiftly eradicated, and the "lucky" few who survive lose their free will after being put under Mass Hypnosis. To drive this point further, there are bookends in Charles' study which are shaped like the mythological figure Atlas,note and they symbolize his heavy burden of trying to save the world.
We look around Xavier's school some more, exploring every nook and cranny of Prof. X's office. We spot a couple of Atlas-themed book-ends, with two muscular men carrying planets on their backs. It makes us flashback to that dark room, where we saw McAvoy cry. If ever there was a man with the weight of the world on his shoulders, it's James McAvoy's Professor X.
- Crossed with Apocalypse Maiden in Dracula Untold. If Vlad manages to resist drinking human blood for the three days needed to reverse his vampirism, the elder vampire won't be able to escape his cave and wreak havoc. If he doesn't due to, say, needing to use the power a bit longer or giving in to temptation...
- The protagonist of It's a Wonderful Life is the sole force of good keeping his town from becoming a Crapsack World.
- The Childlike Empress in The Neverending Story is a Fisher King for the land, and her illness is thought to be what's causing The Nothing that's destroying Fantasia, but her sickness is actually due to her needing a new name. (Fantasia is failing because very few humans are visiting these days. The two problems are related and can be solved in a similar manner.)
- Ehlana, Queen of Elenia in The Elenium trilogy by David Eddings, serves as a Barrier Maiden during the first 2¼ books. The ghost of a dead knight comments to the series protagonist that "the darkness hovers at the gate, and Ehlana is our only hope of light." The action of the series mostly focuses around recovering the mystic artifact that will keep the poisoned queen from dying, and thus prevent the world from succumbing to the grip of evil. Her situation is unusual in that it's not any magical power she has that makes saving her critical, but that allowing the next in line (her cousin and suspected half-brother) to take the throne would give the villains enough cash to buy leadership of the church and turn it into a Church Of Evil. The MacGuffin needed to rescue her turns out to also be needed to kill the God of Evil that is the Big Bad.
- In The Elfstones of Shannara, one of the main characters is a Barrier Maiden. A bit subverted, in that a magical tree is keeping shut a rift to the Demonic Underworld, and it begins to die. The female lead, Amberle, is the chosen one, but we only find out in the climax that this doesn't mean she heals the tree - she becomes the tree. Which is a bit sad when you're a 12-year-old kid.
- While the Archive from The Dresden Files doesn't actually prevent the destruction of the world by her existence, she is a repository of all mankind's knowledge and knows everything that is ever written down. Particularly in Small Favor, she's treated as quite possibly the single most badass Barrier Maiden in all of history. There is also the Oblivion War, which is a battle against ancient demonic gods who still want to rule this reality. The participants in it are few, and rightfully so. They seek out to destroy all instances of a god's name on Earth, including in human memory. Once it is purged and those who fought to purge the name forget themselves, Archive deletes the name from herself and banishes the god from Earth forever.
- Cold Days reveals that Mab protects reality from the Outsiders, and Titania protects everyone else from Mab.
- Jade Pearl, of Bridge of Birds, is a rather atypical Barrier Maiden.
- A rather darker example of the trope: in The Vampire Chronicles, the first vampire, Akasha, is in suspended animation and closely guarded in an underground vault by her vampire servants; while she herself is virtually indestructible, if she is harmed, all the vampires dependent on her would be destroyed. In ancient times, a usurper placed her in the sunlight: while she only received a tan, vampires around the globe burst into flame.
- There is a clear example in Tolkien's The Silmarillion: Melian the Maia uses her powers to guard and defend Doriath with a protection called the Girdle of Melian.
- Galadriel does the same with Lothlórien in The Lord of the Rings. It should be noted that it was Melian who taught Galadriel her stuff.
- To a lesser extent, Lúthien (who happens to be Melian's daughter): the War of the Jewels is temporarily suspended as long as she's wearing a Silmaril, because she's Lúthien and nobody wants to take the jewel from her. As soon as it passes to her son Dior, the war starts right back up again.
- Senna from Everworld serves as some sort of weird cross between this and Apocalypse Maiden. She's basically a living portal between Everworld and "the Old World" (ours), and several forces in Everworld want her for various reasons. An added twist: in a world full of murderous deities and a god-eating Eldritch Abomination, she intends to become the Big Bad herself.
- It helps that she's raised an army of cultists around herself in the Old World, and intends to bring them to Everworld, where she will use their 20th century tech to overcome the gods.note
- The Eternals from Fablehaven are a group of immortal Barrier People (not all maidens) who serve as the second lock to opening the demon prison Zyzyx. Immortality has not been kind to them, such that it is not actually all that difficult for them to be convinced to take their own lives. The Big Bad's Ironic Hell is to become one of them.
- Princess Jenna from Septimus Heap. Basically, the safety of the Castle depends upon her presence in the Castle, leading to both the plots of Magyk and Flyte as she is persecuted by DomDaniel and actually kidnapped respectively.
- Jelena of Griffin's Daughter is of the Cosmic Keystone variety. The Key, a source of immense magic power, was sealed within her while still in the womb, by elf mages who pulled her mother through time for the purpose.
- Maat from the Paradox Trilogy is a powerful psychic who was turned into a barrier maiden against her will by the alien lelgis. She is trapped in an And I Must Scream situation so bad that she is desperate to die, regardless of what the consequences would be for the rest of the universe.
- Burn from the Malazan Book of the Fallen serves as a barrier maiden and Cosmic Keystone. As long as Burn is sleeping, she dreams existence into reality. You really shouldn't harm Burn, if you like having a world in which to live.
- A similar, but much more mundane concept was discussed in Atlas Shrugged in a conversation between Francisco and Rearden. With the world inexplicably falling into defective forms of Communism, America is the only country effectively producing capital and resources. Meanwhile the government continues to crackdown and tighten control over those few remaining functional industrialists and executives, who are the only thing keeping America from collapsing and ceasing its support of the rest of the globe with subsistive handouts. Francisco stated that "when Atlas had the world on his shoulders and it became too much to bear, he shrugged." Later in the novel, Dagny is effectively the the only Barrier Maiden left, since her skill in managing her company's rail lines is the country's only effective logistics left, keeping America from collapsing as well.
- An interestingly named example is the Apocalypse Maidens from Princess Holy Aura. While they fit the Barrier Maiden trope by being the only force that can stop Eldritch Horrors from entering and taking over the universe, they're named Apocalypse Maidens because they're intended to prevent the Apocalypse.
Live Action TV
- Dawn of Buffy the Vampire Slayer is the Key that holds closed the barriers between dimensions. Season Five centers around a Sealed Evil in a Can trying to leave Earth by using Dawn. Not only that, but near the end the heroes get into a discussion of what to do if the worst happens, and we get to watch Giles and Buffy argue over whether killing Dawn is an acceptable last-resort option...with Buffy finally stating flat out that if any of her friends try to harm Dawn, she'll kill them. Turns out she actually feels Dawn is part of her, and closer to her than Willow, Xander, or anybody...and she ain't doing the Angel-skewering thing again, not even to save the world.
- Two seasons later, as the series finale approaches, she and Giles discuss the matter again (hypothetically) and she admits that her decision at the time as based on emotion not reason or morality. If she had to make the same choice again in the present (one life to save the world), she's not proud to say she might choose differently.
- Lunagel (Rin) from Mahou Sentai Magiranger is the gatekeeper whose body and life keeps the evil monsters imprisoned in Infershia. Clare serves as her US counterpart in Power Rangers Mystic Force, though unlike previous gatekeepers, she nonsensically gets to stay alive when the gate is inevitably broken.
- A bit different in both versions. In Magiranger, her life force maintains the seal, so if she is killed, the gate will open. (The wheel thing above her head while she was captive, there in both versions, was to break the protection spell that normally makes this impossible.) In Mystic Force, the title of Gatekeeper is passed down, but fully sealing the gate killed Clare's mother, so it's said that opening it will kill Clare. The wheel thing was designed to tap that power. (She should still have died, though, and there wasn't even a Hand Wave. Rin, on the other hand, is in the clear, as it's not operating the gate that would kill her, but the other way around.)
- Princess Astra in the Doctor Who serial "The Armageddon Factor."
- The Keeper of Traken from the serial of the same name is quite possibly the inspiration for the Magic Knight Rayearth example. The Keeper has great power, but having to focus that power to maintain the Traken Union has to get And I Must Scream-y after having to do it and nothing else for years and years and years, but that's not the plot point that it is in Rayearth. Also, like Rayearth, there are still those who want to take the position despite knowing this.
- In Supernatural we get Lilith, the devil's right-hand man — er, woman, I mean, demon — who is the final seal holding Lucifer in his cell. Once she's dead, he's free to bring the apocalypse. Interestingly, there's a completely separate (male) character serving as the Apocalypse Maiden.
- The Imagin of Kamen Rider Den-O want to make their Alternate Timeline a reality by destroying the existing timeline. They travel to the past, laying destruction there, but the existence of Singularity Points (the Kamen Riders) prevent any permanent changes. The Big Bad then figures out that a special Singularity Point, called the "Junction Point", is the one keeping the timeline stable, and that the Imagins' victory will only be ensured by destroying the Junction Point.
- Adolf Hitler is this of all persons in The Man in the High Castle, though in a more mundane manner. The series takes place in 1962 of an alternate timeline where the Axis powers won WWII. It is established early on that Hitler being alive is the only reason the alternate 1962 is still peaceful and not a nuclear wasteland. Japan and Germany are still at peace, because Hitler respects the Japanese and sees them as equals. Should Hitler die, his successor, probably Himmler or Goebbels, would definitely attack the Japanese Empire in an attempt at full world domination, resulting in another but more devastating war, highly implied to be a nuclear war.
- In the Synchronicity series of Vocaloid songs, the Dragon Diva is a girl who must keep singing and dancing to appease the dragon who keeps the land in a perpetual state of prosperity. Once she becomes the Diva, she is cut off from the rest of the world until she dies, at which point a new Diva is chosen to take her place. The story focuses on Len's quest to rescue his long-lost twin sister Rin, who was kidnapped as a baby in order to become the current Diva, and stop the cycle once and for all, even if it guarantees the nation's eventual decline and ruin.
- In Classical Mythology , for crimes against the Olympians, Atlas, one of the Titans from Greek myth, had to carry the heavens (not the Earth itself, but the sky above it) for all eternity. He was ultimately turned to stone by Perseus for being a Jerkass to him on his way back; whether or not he was still aware is up for debate. But then Perseus was one of Hercules's ancestors.
- In the Tarot cards, the High Priestess, also known as the Lady Pope or Popess, sits in state on a throne which bars the way to a doorway sealed by a veil. Her virginity is implied - she is the Lady Pope, after all - and she is viewed as Doorway Guardian to the Other, either the Afterlife of reigious faith or the Otherworld of mysticism.
- The katechon in orthodox christianity serves this purpose
- Ashling from the Magic: The Gathering setting of Lorwyn was supposed to be one of these, bringing the flamekin's fire through the transition to Shadowmoor. She didn't go along with the idea.
- Warhammer 40,000:
- The God-Emperor of Mankind from serves as this in a few ways.
- The more "mundane" and arguably the most important is that his psychic might maintains the Astronomican, the only thing keeping the armies of the Imperium capable of navigating through Warpspace. If the Astronomican vanishes, then the vast fleets with the millions of lives aboard them would be lost to the Warp, and the Imperium becomes a million isolated world alone in the dark, waiting for death.
- He may also be fending off the Dark Gods and supporting the Imperium the best he can in his capacity as the Imperium's deity, keeping humanity from being claimed by them. This wouldn't end humanity exactly, at least no right away, but very few people benefit from this, most would be killed, and the rest can expect a Fate Worse Than Death. It would also effectively end humanity's role as a galactic power, which opens us up wholesale to predations by hostile alien species.
- Additionally, in a more traditional sense for this trope, he may still be keeping a sundered Webway terminal underneath the Imperial Palace closed. If true, then if it were to break open again, Daemons would come pouring out and would effectively destroy Earth. Ignoring the fact that the Astronomicon would be destroyed by this for a moment, Earth is still the Imperial capitol, and a major political and administrative hub. If Earth went dark due to daemonic invasion, then the Imperium could expect to become crippled as unity, logistics, and command structures throughout the Imperium would start breaking down.
- The God-Emperor of Mankind from serves as this in a few ways.
- Warhammer has Caledor and the other High Elf wizards locked upon the Isle of the Dead. They are time-locked in a constant ritual that keeps the power of Chaos from overwhelming the entire world. If they ever die, or are ever freed, it's the end of everything.
Once, there was a maiden.......and before her came all the peoples of Creation, and knelt.They set aside their petty squabbles in her name.They acclaimed her with many shouts.They prayed for her safety, and her weal.Not one of them struck free her chains."To know the world...""...is to own it," she said.
- In Kingdom Hearts The Seven Princesses of Heart collectively have the power to reveal the keyhole necessary to get to Kingdom Hearts, the origin of life in the universe and a recurring MacGuffin. The bad guys do all they can to find the missing Princesses so they can fully take over.
- On a bigger scale, the Princesses' hearts of pure light repel darkness and keep all the worlds in the Realm of Light safe just by being there.
- Bastila Shan in Knights of the Old Republic, though this is due to her incredible skill with battle meditation and her telepathic link with a former Dark Lord of the Sith, so she is much more of an Action Girl than most Barrier Maidens.
- In the World of Mana series, The World Tree is not the same Mana Goddess that created the world as legend says, but is a person of some variety who became the new Mana Goddess/Tree the last time the world needed a new one. This is played to particularly devastating effect in Sword of Mana, the remake of the first game, in which the female protagonist plays this role. It's particularly devastating in Sumo's route since she's also the Love Interest of the main character there.
- In the Touhou series, the sealed-off Fantasy Kitchen Sink world of Gensokyo is separated from reality thanks to a barrier that separates reality from fantasy.
- Hakurei Reimu is of a lineage of human shrine maidens whose duty is to maintain peace in Gensokyo and to maintain the barrier - the Great Hakurei Border. While she is not directly stated to the reason the Great Border exists, her death is something that would begin its inevitable collapse.
- Yukari Yakumo is the youkai component of the Great Border's support. As a Reality Warper, she is capable of providing upkeep to the Border, though she has manipulated its filtration on occasions to allow certain things to pass between different worlds more easily.
- In the game Perfect Cherry Blossom, Saigyouji Yuyuko wants to help a poor spirit that is trapped inside a seal that is keeping the power of a rather malevolent youkai cherry tree Saigyou Ayakashi dormant, and she believes making the tree bloom will break the seal. In the end, the seal weakens enough to reveal that Yuyuko is the person who was buried under the Ayakashi and her remains are also a visceral component to that seal that she was trying to break.
- The Legend of Zelda:
- A Link to the Past has seven of these (successors to the seven Sages in Ocarina of Time) maintaining the seal on the Dark World.
- In Four Swords Adventures, Zelda and the six Shrine Maidens are responsible for ensuring that Vaati remains sealed inside the Four Sword Sanctuary.
- The Lokomo of Spirit Tracks are charged by the Spirits of Good with keeping the Demon King Malladus sealed inside his prison. Unlike most examples, the Lokomo are mostly elderly males.
- Skyward Sword does it again with Zelda, revealed to be the mortal reincarnation of the goddess Hylia. After you beat the sixth dungeon and meet up with her in the past, she reveals her identity and puts herself to sleep in the Sealed Temple to keep the seal on Demise intact. That's why if you manage to let The Imprisoned reach the temple even once...
- In Breath of the Wild, Zelda has been keeping Calamity Ganon sealed inside Hyrule Castle with her for the past 100 years.
- Likewise, Dragon Quest VIII featured seven descendants of the ancient seven sages who sealed Rhapthorne in the Godbird Sceptre, and who Rhapthorne had to kill (using others as pawns) to restore his corporeal form. The fate of these descendants is obvious.
- In StarCraft Kerrigan is revealed to the only thing holding back the void from destroying the universe. This is because she is one of two beings in the universe that can control the Zerg, a massive Horde of Alien Locusts. The other is the God of Evil.
- Princess Peach in the original Super Mario Bros., the plot of the 1985 NES game told only in the manual, is that Bowser turned the inhabitants of the Mushroom Kingdom into bricks, and Peach has the power to bring them back, not much is talked about Peach's magical abilities in later games, and there's the issue about Mario breaking bricks around, joked in this Brawl in the Family strip.
- The Barrier Maiden thing was abandoned for a while, with Bowser's Motives changing from pure conquest to trying to win Peach's affection. However, more recent games have restored her Barrier Maiden status, though in a different form each time.
- In Yoshi's Island DS, Baby Peach is one of the Seven Star Children who are born with great power. Bowser attempts to steal the children to take over the universe (this would include Kidnapping himself, which would result in a few time related issues...) Peach is actually one of the children who escapes capture, and assists Yoshi and Baby Mario in saving the others.
- In Mario & Luigi: Superstar Saga, Peach's voice is the only thing that can awaken the Beanstar, which grants wishes. She avoids capture through clever use of a Birdo, and again by having Luigi crossdress as her.
- In Super Paper Mario, Peach and Bowser are a Barrier Couple. If they ever got married, the Chaos Heart would be formed and begin to destroy the world. Naturally, this is the first thing the Big Bad does in the first part of the game. Peach is so easily kidnapped...
- The Barrier Maiden thing was abandoned for a while, with Bowser's Motives changing from pure conquest to trying to win Peach's affection. However, more recent games have restored her Barrier Maiden status, though in a different form each time.
- The Fatal Frame series features several of these, typically as the Woobie, Destroyer of Worlds Big Bad. Each game involves rituals using a Virgin Sacrifice to hold back a great evil, that eventually failed and unleashed a terrible curse on the location. The heroine's task is to discover what went wrong, and free the Maiden from her torment.
- In the first game, the Rope Shrine Maiden is ritually dismembered so that her soul can hold the Hellgate closed for a decade. The last Maiden, Kirie, was unable to focus on her task and her grief caused the gates to burst open. In the canon ending of the game, she makes the choice to spend eternity holding the gates closed.
- In the second game, the village ritually sacrificed Twins to prevent hell from slipping through the Abyss. One twin kills the other, with each serving to help keep the darkness at bay. When one sister escaped the village prior to the ritual, the one left behind was killed in a last-ditch effort. It failed, and the town was swallowed up in darkness. In the canon ending, Mio kills Mayu in order to reseal the Abyss, freeing the village from eternal night.
- In the third game, the Kuze Family's duty is to keep the sorrows of humanity from leaking out of the rift. Several ritual sacrifices were performed to maintain the barrier, with the Tattooed Priestess taking mankind's sorrow into herself and then being sealed into a shrine at the edge of the rift. The last Priestess was unable to hold the darkness back, after witnessing her lover's murder. In order to end the curse, Rei sends the lovers' bodies across to the other side.
- In the  fifth game, the Maidens have the task of purifying the sacred waters that flow through the mountain. This is accomplished by sealing them into coffins and sending them to the bottom of the lake. These Pillars hold back the darkness, until their powers wane and they dissolve into the waters. The strongest of all Maidens are called Eternal Flowers, slumbering in their coffins for eternity. The last Pillar's grief caused the waters to overflow onto the mountain, though the cursed spirits of the shrine elders still attempt to lure women onto the mountain to become new Pillars. Each ending of the game involves comforting the Pillar, allowing her to resume her task.
- Colette from Tales of Symphonia, the Chosen One, intended to sacrifice herself to keep the evil of the Desians sealed away. Really suffers for it, both for the cost of performing her mission, as well as most of the villains and even a few others treating her as a MacGuffin. Not to mention her mission is a complete lie told by the Desians themselves, who were never "sealed away," her actual purpose being to save her world by screwing over another one, and becoming a soulless vessel for the Big Bad's dead sister.
- Richea Spodune of Tales of Hearts is the non-sacrificial version, and a double serving. First, she's the only thing holding The Heartless in check. When she's temporarily incapacitated, the Zerom and their symptomatic Despir Sickness return to the world like a sledgehammer. Second, the Big Bad requires her power to activate the Space Whale to go release a world-eating monster (he has a reason, trust me). Her elder sister is also one, having fused herself to said monster to seal it away in the first place. Yet another variant example is a massive Power Crystal powering a barrier protecting the village of Norquin. The maiden here is dead, but it's said that her will to protect the village remains in the Psistone and powers the barrier.
- Furiae in Drakengard.
- The protagonist of Persona 3 is one of these, holding back Nyx, the Anthropomorphic Personification of Death - interesting justification for We Cannot Go On Without You. His Heroic Sacrifice makes the seal permanent.
- He was not only just holding back Nyx, but also Erebus, who is the Anthropomorphic Personification of humanity's anguish and wishes for death. If Erebus and Nyx made contact, then the world would end. The protagonist becomes a wall (sealed in stone and stuck to it, no less), destined to stand between the two cosmic horrors forever, or at least until humanity as a whole is changed and stops subconsciously wishing for death. This could mean that he's there to stay but his former companions resolve to do what they can to change the world. Considering three of them could live indefinitely - Aigis being a robot, and Elizabeth being...whatever Elizabeth is - it could be possible in the long run.
- The PSP portable version adds a female protagonist. Despite how she and the male MC aren't exactly the same characterization-wise, she fulfills the same role in-story — and it includes becoming the local Barrier Maiden, too. For better or worse, she can fall in love with the Appriser of Nyx, Ryouji Mochizuki, which adds a Star-Crossed Lovers element here. And here we have three possible companions that could potentially survive until the day she's released: Aigis, Elizabeth, and Elizabeth's younger brother Theodore.
- Another spin of the Kushinada myth is used in The King of Fighters 97. First, like in the original legend there's a group of girls that are kidnapped, and all but one of them become Human Sacrifices for Yamata-no-Orochi; instead of having Susano-o save and then marry the Sole Survivor aka Princess Kushinada, she's rescued by the leaders of the Three Sacred Clans, who then seal up Orochi since they can't kill him. Second, in the present Kyo Kusanagi's Tsundere girlfriend Yuki is the last descendant of the remaining Kushinada maiden, so the Orochi clan plans to sacrifice her in the ritual that will bring Yamata no Orochi back into this world. She survives her ordeal thanks to Kyo, Chizuru and Iori, though.
- Another character from the same series, the Idol Singer Athena Asamiya, is a rare case where the Barrier Maiden is also an Action Girl. As an Expy of the already mentioned Saori Kido, this is expected.
- And then we have the Kagura sisters, Maki and the aforementioned Chizuru, two Mikos who keep the Seal of Orochi safe and tight so he won't return to unleash destruction on Earth. When Maki was murdered by Goenitz, Chizuru was left alone with the mission of taking care of the seal, so she recruits Iori and Kyo in KOF 96 to do this and then helps them re-seal the released Orochi in KOF 97.
- Another girl named Yuki plays the BM role in The Last Blade. Unlike KOF's Yuki, when offered the option to either seal the Hell's Gate or not, TLB!Yuki decides to do so at the cost of her own life.
- Also in this category, in World of Warcraft, is Anveena Teague, who is the embodiment of the remaining energies of the mystical Sunwell. Eventually, she sacrifices herself in order to help the players defeat Kil'Jaeden, and perhaps restore the Sunwell.
- As of Wrath of the Lich King, we can add Bolvar Fordragon to the list. Essentially, Azeroth needs a Lich King to keep the scourge from going all zombie apocalypse on the planet. Bolvar decides, after Arthas's defeat, to succeed him as such, and essentially act as a "jailor of the damned" from the Frozen Throne.
- Final Fantasy VII has a VERY rare Inverted-Evil example. Sephiroth has the good locked away, and you must kill him to release it.
- Summoners in Final Fantasy X would qualify except for Yuna, of course, who breaks the cycle.
- A villainous version also appears in Final Fantasy X in Yunalesca. She tells the heroes (and every group that had made it that far for the past thousand years) that not only must the Summoner sacrifice herself to save the world, but one of her guardians. Then, in order to leave Zanarkand, fight Sin, and save the world for real, she must be killed.
- Shana, from The Legend of Dragoon, is an evil example. At first, you think of her just as The Chick and The Medic, but then you discover she is the Moon Child, the only being able of resurrecting the Virage Embryo, last boss of the game. Until she is used by Melbu Frahma for this purpose, no one, not even her, is aware of her real identity.
- Misha, one of the three potential love interests in Ar tonelico: Melody of Elemia.
- The Elder Scrolls series gives us several rare male examples:
- Morrowind gives us the Tribunal, specifically Vivec. By the time the game takes place, he has been maintaining the Ghost Fence on his own for several centuries, without being able to replenish his divinity. It is the only thing holding Dagoth Ur and the Blight at bay. Vivec is also pulling double-duty by holding up Baar Dau, a large asteroid hurled at Vivec City by Sheogorath. This becomes a major problem after the events of Morrowind.
- Another rare male example: Martin Septim in Oblivion, like the other Emperors before him, is the only person who can carry out the ritual that seals the barrier against Oblivion. At the end, Martin sacrifices himself, sealing the barrier forever.
- In Skyrim, the Thalmor have made worshiping Talos illegal. Why? According to the lore, Talos is one of these, and if nobody worships him, along with the Heart of Lorkhan being gone and the Dragonfires extinguished, Mundus, the mortal plane, itself will cease existing. The Thalmor would see this as a good thing, as they seek to undo creation in order to free their divine spirits from the mortal "prison".
- Sakuya from Ōkami is a cherry tree spirit and powerful protector. Her guardian saplings protect the nearby lands from evil, and their corruption not only weakened her into a coma but allowed evil to flourish. Amaterasu's missions largely revolve around restoring her saplings, culminating in Sakuya being restored and "refreshed".
- Kukuru from Arc the Lad I & II.
- Dragon Quest VII has a particularly cruel version, with the warrior Matilda, as she's being used by the monsters as a Barrier Maiden sealing away their hostages. Making matters worse is that she's a Broken Bird due to her past: her brother tried attacking the monsters' stronghold, but the other villagers chickened out, leaving him to fight until his death waiting for the promised backup that never arrives.
- The Visual Novel Kajiri Kamui Kagura has Tenma Yato, another male exmaple. He is the only one who prevents the Omnicidal Maniac Hajun from destroying the world by keeping Hajun inside a Time Stop. This becomes rather problematic once the main cast kills Yato
- In the Girls Love Visual Novel Akai Ito, this is the job of whoever is taking the role of Ohashira. The first Ohashira was Otsune, and in the present day it's Yumei. The Ohashira essentially become a ghost to seal the soul of Nushi with all the might of her soul. It's quite similar to the myth of Sakuya mentioned above. In fact, a character named Sakuya was really attached to Otsune.
- Nostalgia has one in Fiona. She is the only one who can touch the tablet fragments, thus preventing the bad guys from collecting them without her. She also has to die to seal the Big Bad away.
- It was in Mega Man Zero 2 did we finally find out what happened to the hero of the previous series. He used his physical body to seal the Dark Elf, a powerful Energy Being that is the cause of the World Sundering between the X and Zero series. This leaves X in borrowed time, only appearing to Zero as an Energy Being himself. Destroying X's physical body would release the Dark Elf, which would mean another mass genocide if she's in the wrong hands. And it just so happens to be the goal of the Big Bad of Zero 2.
- In Dark Souls, Gwyn, Lord of Sunlight, is this by virtue of being the Lord of Sunlight. In actuality, his real purpose as a Barrier Maiden is that he sacrificed himself by Linking the Fire, turning him into the fuel that allows all fire in the world to continue existing. Whether or not that is a good thing is an entirely different matter.
- Samurai Shodown has two:
- Hazuki Kazama is a girl who used her powerful sealing techniques to tame and seal two inmensely strong spirits, Enja and Suija, in the swords of her older brothers Kazuki and Sougetsu. Too bad that Amakusa heard about Hazuki's abilities and took a hold of her for the worst...
- Nakoruru can be seen as such as well, specially when she sacrifices her own life to the Spirit of Nature to fix the damage made by Mizuki in the second game and becomes a sort-of protector goddess as a result, spending her time in a Convenient Coma unless it's time to fight.
- In Breath of Fire II, a giant dragon,who is Ryu's mother, is seen blocking the door that leads to the final dungeon to keep the Big Bad from coming out. In a normal ending, Ryu replaces her since she dies.
- In Prince of Persia: The Two Thrones, Kaileena serves as this until the middle of the second cutscene, during which a) it is revealed that her continued presence on her island was the only thing keeping time linear and b) her death allows the (once again alive due to time travel) vizier to ascend to godhood and plunge Babylon into darkness.
- The Valluta is a giant turtle which guards against extradimensional invaders, primarily the beings known as "pests".
- The player has been given the responsibility of preventing gods from interfering with Gielinor as of "The World Wakes".
- Xenosaga series: chaos. Didn't see that one coming, hm?
- Fire Emblem has several:
- On one hand, Deirdre from Fire Emblem: Genealogy of the Holy War is the long-lost daughter of Prince Kurth and carrier of Naga's bloodline. And on the other, through her mother Cigyun she has minor Loptyr blood... which makes her a target for his cult's plan to resurrect him, so they abduct her and get her to unknowingly marry her maternal half-brother Arvis, the other minor Loptyr blood holder....
- Both Ninian and Nils from Fire Emblem: Blazing Blade count since the siblings are sought after for their half-Dragon heritage, which means they're the only ones in-story able to open the mythical Dragon's Gate and allow other dragons to go through it.
- Shigure from Fire Emblem Fates doesn't start as the trope, but in the Heirs of Fate DLC stage he becomes a Rare Male Example: not only he has Azura's magical pendant, but he is supposed to be the only one capable of performing a Magic Music that will complete a world-changing Prophecy. (At least the only one alive, that is; in this Alternate Universe, Azura has already died and only appears as a Spirit Advisor.) In the end, he performs the magic melody with some help from Azura's soul and the other children, and manages to survive and rebuild his world.
- Queen Mikoto qualifies as well since she placed a protective spell over the Hoshidan lands, causing Nohrian soldiers to lose their will to fight as soon as they step into the borders. When she's murdered, the magic wears off and this allows the Nohrian troops to enter Hoshido. The CD Dramas, however, imply that Mikoto's magic barrier had already started to weaken before she kicked it.
- Super Robot Wars X:Hopes’ true identity is an “infant form” of a divine beast on the same level as The Heavenly Realm Dragon Deities, whose original purpose was to be one of Ende’s possible new vessels. But Hopes gained more of a self-conscience during his containment within The Order and wished to see the world and learn the meaning of life, hence his plan of escape with the protagonist. As he ventured through the war against Ende, he understands he prefers to be fed with the will and emotions opposite of Ende, and hence decide to use the aid of X-Cross, along with his divine powers to preserve, and uphold the world of Al-Warth after terminating Ende.
- Snowman from Homestuck is an evil Barrier Maiden—no one will kill her because they know if they do the whole universe will end, and she takes advantage of this to torment Spades Slick without fear of retribution. He eventually does kill her, destroying their universe.
- Vriska is one of these too, as before John retconned the timeline and stopped Terezi from killing Vriska, H.I.C. was able to take over the Incisisphere.
- Varla from Dungeons & Dragons is both this and a Reality Warper. Poor, poor little girl
- Will Vandom and the other Guardians from W.I.T.C.H. may be partial examples, as the Veil that separates the worlds is drawn from the Heart of Candracar and the resulting drain on their power makes them weaker during Season 1, Will having the worst of it since it deprives her of any offensive ability; she doesn't even know what her elemental affiliation is! When the Veil is lowered in Season 2, all the Guardians receive a power boost as their powers return, Will gaining the power of Quintessence which is Shock and Awe, the ability to animate objects and give personalities to electrical appliance among other abilities.
- Turtles Forever has the original Mirage Turtles. Their death will trigger the end of The Multiverse.
- In an alternate timeline of Adventure Time, it turns out that if Ice King ever died while his crown still had power, it would then freeze the whole world over for hundreds of years.
- It was never outright stated on the show, but it was strongly hinted that Juniper Lee was one. Even more so in the finale, where June restores the Veil after Auntie Roon had almost succeeded in keeping the Broken Masquerade. June fixes it by reciting the oath of the Te Xuan Ze.
- As revealed in "The Pizza", Larry from The Amazing World of Gumball holds so many jobs that his continued employment is essential to keep the town of Elmore's economy running. After he quits, The Apunkalypse ensues.
- Merlin, in the pilot episode of King Arthur & the Knights of Justice, heavily implies that Queen Guenivere is one of these, calling her "our last hope for the future." Unfortunately, the series didn't last long enough for it to be clarified just why she would be this.
- In the season 2 finale of My Little Pony: Friendship Is Magic, Shining Armor acts as a male version of this trope.
- A considerably more mundane (but no less badass) version occurred when assassins attempted to kill James I of Scotlandnote , and a conspirator removed the bolt on the door, meaning it couldn't be locked. A noblewoman named Catherine Douglas stuck her forearm in the slots, and held it there until the assassins broke her arm by shoving on the door. Unfortunately, this meant they succeeded in killing King James in the end. Legend says she took the surname "Barlass" (i.e. Bar-lass) after the incident.