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Undertale / Tropes B

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You can view the main article here.
Tropes A here.
Tropes B here
Tropes C-F here.
Tropes G-N here.
Tropes O-Z here.

Note: "No Mercy" and "Genocide" are two names for the same, officially unnamed, route of the game.
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    Trope Ba 
  • Back for the Finale:
  • Background Music Override:
    • The Core's theme music continues playing even during monster encounters. It's a very clever way of establishing that these monsters aren't like the rest – they're hired mercenaries, who aren't random citizens merely expressing themselves with magic, but are scripted encounters that are actively trying to kill you. As such, they're part of the area's obstacles and puzzles rather than monsters with their own random encounter theme.
    • In the True Pacifist ending, "Reunited" continually plays as you revisit all the Underground's previous areas and locations for the last time (except for Papyrus's room, for some reason). If you then enter the mystery room in Snowdin Forest, it switches to that room's theme.
    • If you play the spook music, it will still be audible in the area south of Napstablook's house. If you hang around long enough for an encounter, the monsters will stop and say, "What... is that music?" and will be too spooked to continue the encounter. Aaron is particularly affected by it, and his "Where Are They Now?" Epilogue in the end credits becomes "Paranormal Investigator."
    • On the Pacifist and most Neutral routes, you can eat dinner with Sans at the MTT Resort's restaurant, where "It's Raining Somewhere Else" (a slower, more melancholy arrangement of "sans.") will play. The music will replace the hotel's music until the player leaves the resort.
    • On the No Mercy route, once you've exhausted a particular region of Random Encounters and get into a "But nobody came" encounter, the music will continue even as you exit the battle interface. This will also happen if you get this message in a Neutral run that does not turn into a No Mercy run (e.g. clearing Waterfall's encounters after sparing Toriel and/or Papyrus), but the normal music will return at an appropriate screen transition.
  • Backstory:
  • Backstory Horror: Oh, so much. This game may have its funny and heartwarming moments, but it’s also fricking dark.
  • Badass Adorable:
  • Badass Bystander:
    • The Annoying Dog is the Author Avatar of Toby Fox, complete with Author Powers, but all he does is play pranks on people and never interferes with the events no matter what you do. The only exception is that one ending where you kill all of the bosses but none of the encounters, and he ends up king. And even then, according to Sans, all he does is laying around.
    • All Sans does during the game is watch you from various distances, prank you, deliver jokes, and make the occasional death threat. He's perfectly capable of carrying out those death threats, but he won't bother to do so unless you've murdered everyone else in the Underground and letting you live means risking the obliteration of absolutely everything.
  • Badass Cape:
    • Papyrus sports a red one as part of his “battle body” (though most fan artists seem to mistake this for a scarf).
    • Asgore has a purple one, and on the overworld it seems to be the reason for how much space he takes up compared to everyone else… then he throws it back during his boss fight and it's revealed that he's just that huge.
  • Badasses Wear Bandanas: Parodied by the Manly Bandana.
    It has abs drawn on it.
  • Badass Family: The Dreemurrs. Toriel has 80 ATK and DEF and is a powerful pyromancer. Asgore has the same abilities, but with combat training and a trident, led his own armies into battle in the War of Humans and Monsters, and is capable of an Interface Screw. The only other characters capable of this are the three final bosses! Also, two of those bosses are alternate forms of Asriel, Asgore and Toriel’s son. And of course, Chara/Frisk can save the monsters without hurting a fly or destroy the world with a stick.
  • Badass in Distress:
    • A minor case at the end of the fight with Undyne, where she passes out from the heat. The player can pour water on her to wake her up, and she'll walk off in a huff. However, if you don't, Undyne gets heatstroke and cannot be befriended in that run.
    • Everyone in the True Pacifist route, right after Toriel interrupts your fight with Asgore. Flowey takes everyone hostage and absorbs their souls. And that includes badasses like Undyne, Papyrus, and basically every person you ever encountered in the game, and they're not pushovers.
  • Bad Future: Pretty much every ending that's not the Golden Ending is either implied or outright stated to be one of these. In all endings, the human souls vanish, taking any hope the monsters had of escaping with them. On top of this, the Underground can become completely militarized, an Egopolis, or the monsters can be left on the brink of extinction (if not outright driven extinct). Even in the best non-Golden Ending circumstance where you spared everyonenote , while the monsters' situation isn't all that bad, they still lost the human SOULs that Asgore has gathered, and while Alphys is researching alternative ways to break the barrier at Toriel's behest, it's left ambiguous as to whether or not she has any chance of succeeding. At any rate, it doesn't look good for the monsters.
  • Bad News, Irrelevant News: This gem from the True Lab:
    Alphys: ASGORE left me five messages today. four about everyone being angry. one about this cute teacup he found that looks like me. Thanks Asgore.
  • Bad Powers, Good People:
  • Bad Vibrations:
    • The floor shakes when Mettaton approaches for the first time.
    • If the game's in windowed mode and you choose to not destroy the world at the end of the No Mercy route, the game itself will start shaking during the Fallen Human's jumpscare. Regardless of choice, the window also shakes back-and-forth as the world is destroyed.
  • Bad with the Bone: Being a proud skeleton, all of Papyrus' attacks are bone-based. As are most of his brother Sans' attacks, though Sans adds his own unique twist to several of them.
    Flavor text: Papyrus prepares a non-bone attack, then spends a minute fixing his mistake.
  • Bag of Holding: You can carry the equivalent of two boxes of equipment in your phone.
  • Bait-and-Switch:
    • During the boss battle with Papyrus, he tells you to prepare for his "blue attack." At first, it seems just like all the turquoise attacks dealt with previously, in which you simply have to not move, but it turns out the attack is actually to turn your heart blue, subjecting it to gravity.
      Papyrus: YOU'RE BLUE NOW. THAT'S MY ATTACK!
      • The baiting goes as far back as dialogue with Sans throughout the area prior, with Sans explicitly warning you about said "blue attack" and specifically implying that it is indeed based on turquoise attacks. Of course, knowing Sans, he obviously knows what his brother actually has in store and is just messing with your expectations because it's funny.
    • The first attack from Undyne the Undying starts off very similar to the versions used in the other routes, being just a slow line of bullets coming from a single direction… and then it breaks into a much faster flurry of bullets coming from all other directions.
    • One area has a row of five refrigerators. The one in the middle shakes every now and then despite having Flavor Text that says it's empty, but nothing else happens. The one on the far end of the room is perfectly still and also says it's empty, and nothing happens until you approach the door. The fridge suddenly reveals itself to be an Amalgamate, morphing into a humanoid shape with no face.
  • Bait-and-Switch Boss: At the end of the True Pacifist Route, it seems like you're about to confront Asgore once again… and then Toriel swoops in and saves you. Afterwards is a heartwarming cutscene of you reuniting with your friends, and then another where Flowey steals the human souls and the souls of your friends to become the One-Winged Angel Asriel Dreemurr.
  • Bait-and-Switch Comment:
    • Papyrus has many of these.
      Papyrus: HUMAN. ALLOW ME TO TELL YOU ABOUT SOME COMPLEX FEELINGS. FEELINGS LIKE... THE JOY OF FINDING ANOTHER PASTA LOVER. THE ADMIRATION FOR ANOTHER'S PUZZLE-SOLVING SKILLS. THE DESIRE TO HAVE A COOL, SMART PERSON THINK YOU ARE COOL. THESE FEELINGS...THEY MUST BE WHAT YOU ARE FEELING RIGHT NOW!!!
      Papyrus: [at the Dogi's station] THE STATION OF THE MARRIED DOGS...HMMM. DO YOU EVER THINK ABOUT DOING THAT SOMEDAY? MARRYING A DOG? [...] NAH...THAT'S WEIRD. THERE ARE WAY BETTER ANIMALS TO MARRY. LIKE SKELETONS!!!
      Papyrus: GARBAGE, HUH? BOY, DO I KNOW GARBAGE!! AFTER ALL, I'M HOUSEMATES WITH A LAZY BAG OF TRASH! HIS NAME'S TRASHY. HE LIVES IN THE GARBAGE CAN. [...] YOU DIDN'T THINK I DIDN'T NAME MY GARBAGE, DID YOU?
    • Then there is Undyne talking about Papyrus.
      Undyne: [after Papyrus jumps out her window, shattering the glass] I can't believe he leapt through the window like that. Normally he NAILS the landing.
    • Then there's Muffet on the No Mercy run.
      Muffet: [Alphys] even left a route for me to escape from~ She said she would block off the rest of Hotland for me~ Foolish nerd~ A spider NEVER leaves her web~ (Except to sell pastries~) Ah, but I do feel a little regret over it now… yes, I should have wrapped her up when I had the chance~ She looked like she would have made a juicy donut~~
  • Bait-and-Switch Tyrant: In a couple of Neutral Route variations:
    • If you kill Toriel, Undyne, and Mettaton, but not Papyrus, he becomes the ruler of the underground. Many people may expect Papyrus to create an Egopolis or force everyone to eat his spaghetti. However, it turns out that Papyrus is actually a very peaceful and kind ruler, and Sans even says that productivity has gone up.
    • If you kill the four primary bosses but no other monsters, the Annoying Dog becomes the ruler of the underground, and just sleeps on the throne all day. Oddly enough, Sans says this is the best life for everyone, and even thanks you (keep in mind you had to kill Papyrus to get to this point). Almost makes you wonder if the Dog brainwashed the monsters…
  • Bait the Dog:
    • The first encounter with Flowey. For all the world, it looks like the lonely lost child has run into a helpful and friendly NPC who is about to show you "how things work around here", and then he tries to kill you and calls you an idiot for falling for it.
    • We've just heard about Mettaton going nuts, and then he bursts into the room. For a while, he seems really fun and entertaining… and then he tries to kill you. Downplayed, because he's still very entertaining after this, and eventually subverted when he reveals he never was trying to kill you, but then double subverted when he actually does.
  • Ballistic Bone: During the boss fight against Papyrus, his attacks consist of throwing bones of all kinds at you. If you check out his house later you'll even see a box full of them. Makes sense considering he's an ambulatory skeleton. Sans also uses similar attacks, but ramped up to eleven in terms of speed, frequency, patterns, e.t.c.
  • Barefoot Cartoon Animal: Several characters, including Toriel and Alphys, as well as many common monsters and some mini-bosses. Which makes one wonder why Toriel needs a sock drawer.
  • Barely-Changed Dub Name: In the Japanese localization, “Sans” turns to “Sanzu”, “Mettaton” turns to “Metaton”, and "Alphys" into "Alphy". It should be noted though that the changes in Sans's name are mostly the result of Japanese accent and writing conventions — that's how the Japanese would pronounce the name anyway.
  • Bar Slide: Sans does this to give you his fries if you spill ketchup on yours.
  • Bathos: The game is mostly silly, but can be this:
    • A Genocide Route, for instance, is a straight-up tragic borderline Cosmic Horror Story where you are a Humanoid Abomination. A True Pacifist Route is mostly lighthearted, but it has its own depressing moments and one extremely dark and horrifying section with the True Lab. A Neutral Route can be riddled with this if you do decide to kill some monsters. Maybe you laughed at Papyrus’ antics and spared him, but then battled Undyne and killed her in self-defense… and then had to bear witness to her slowly fading away while despairing at her inability to defeat you and protect those she loves.
    • Even the Genocide Route has its own darkly humorous moments. After slaughtering your way through most of the Underground, you can have a conversation with Burgerpants where he completely fails to realize that everyone else in Hotland is either dead or evacuated, and when informed of it, only wonders if that means he doesn't have to go to work. Or the fact that after murdering everyone and reaching Asgore's house to kill him, the Fallen Child has ominous lines in red text about their past as you examine items in the house… and complains that they want some chocolate when you examine the fridge.
  • Bathtub Mermaid: According to Onionsan, most aquatic monsters are being kept in aquariums at the capital.
  • Batman Gambit:
    • Papyrus pulls a pretty smart one on Undyne in order to get her to befriend the human. He brings the human to Undyne's house, knowing that Undyne won't harm a guest, and when it appears that that she'll just throw them out in disgust, comments loudly in earshot of her how disappointed he is that Undyne just isn't up to the challenge of befriending a human.
    • Flowey pulls one on you, the player, if you get the neutral ending and spare him. In order to get everyone in the underground into one place and absorb their SOULs, he goads you into going down the Pacifist route, because he knows that you want to "win" and get the "best ending". Do what Flowey predicted, and he can take the SOULs of every single monster in the underground, which is just barely enough power to equal the seventh human SOUL he needs to complete his transformation into Asriel Dreemurr.
    • If you do a second No Mercy run, the Fallen Child's speech will change, suggesting you try something different next time. Because now that they have your SOUL, completing the True Pacifist path will let them out into the world to presumably wreak havoc without your influence.
  • Battle Amongst the Flames:
    • Most battles in the game take place against a featureless black backdrop. The battle with Asgore is notable for having an orange glow with sparks rising from the bottom of the screen, which is probably intended to invoke this. Justified since Asgore fights using powerful fire magic.
    • Subverted in the case of Undyne. After she accidentally sets her house on fire trying to teach you to cook, she decides that your friendship isn't meant to be and tries to finish the battle she started earlier. However, after you hit her with a fake attack, she realizes that neither of you really want to hurt each other, and the two of you finally make peace and evacuate the burning house as friends.
  • Battle Couple:
    • Two of the Royal Guard members you have to fend off are a married couple, Dogamy and Dogaressa. They have matching his-and-hers sentry stations — labeled with actual signs saying "His" and "Hers" — and they keep touching noses and "saying sickly sweet things to each other", as the flavor text states, while they fight you.
    • Then there's the team of RG 01 and RG 02, who have Unresolved Sexual Tension to spare and can be persuaded to admit their feelings for each other.
  • Battle Intro:
    • The final boss of the Genocide Route has a relatively lengthy introductory monologue saying how you should be burning in hell for all you've done. If you go for a rematch after getting past his opening barrage for the first time, there's a good chance he will skip his monologue at random straight into his opening barrage to catch you off-guard.
    • The final bossnote  of Neutral runs will raise the containers of the captured souls of the six previous fallen humans, as well as an empty container waiting to hold yours. He will give a somber monologue expressing his regret for what he's about to do, before lowering his head so that his eyes are no longer visible and destroying your Mercy button.
    • Subverted with Undyne, who poses dramatically on top of a rocky craig and begins to tell you the tragic backstory of the Kingdom of Monsters, but then decides there's no reason to do it when you're about to die anyway. She then just leaps down to attack you.
  • Battle Theme Music: The soundtrack has normal random encounter music (Enemy Approaching), as well as unique boss and miniboss themes, usually featuring a plethora of leitmotifs.

    Trope Be 

    Trope Bf-Bi 

    Trope Bl 
  • Black-and-Grey Morality: Some Neutral Routes are this, with the Player Character being pretty iffy from the deaths they’ve caused, but Flowey is still unambiguously the villain.
  • Black-and-White Morality: The True Pacifist Route. The Player Character is an innocent Messianic Archetype and an Actual/Badass Pacifist who can talk down an Eldritch Abomination, and then you have the sadistic sociopath Omnicidal Maniac who wants to trap the Player Character in an endless loop of death.
  • Black Bead Eyes: Very common among the NPCs. The most notable example is Flowey.
  • Black Box: The junk in the garbage dump is this for the monsters.
  • Black Mage: Surprisingly, most of the monsters, despite their friendly nature. The most notable examples are the Skelebros, who have powerful attacks based on bones.
  • Black Market: Parodied. Sans has an illegal hot dog stand; the player only knows it's even illegal from Papyrus telling them, as Sans makes absolutely no attempt to conceal what he's doing. (Papyrus being Papyrus, it's entirely possible that the hot dog stand isn't illegal.)
  • Blackout Basement: There's a room in Waterfall that's too dark to see where you're going without repeatedly turning on lanterns, which only light up the room for a few seconds at a time. It doesn't help that this room's paths are set out like a maze, meaning it might take a few tries before you find the right path to the next room (which is slowed by an occasional Random Encounter). Thankfully, the room is permanently lit after defeating Undyne.
  • Black Shirt: A surprising amount of monsters are gung ho for Asgore getting one more soul and destroying humans. Keep in mind that monsters are said to be made of kindness, love, and compassion.
  • Blamed for Being Railroaded: Muffet starts a fight with you because she sees you as a cheapskate for not buying any of her ludicrously expensive goods. This is despite the fact that, barring cheating or spending hours on grinding, there is no conceivable way you could have the money necessary to buy them. Less bad than usual for this trope, since the game portrays the price tag (and by extension, Muffet) as unreasonable to begin with. Then again, you had the option to buy spider goods for very cheap in the Ruins, so if you have one of those...
  • Bland-Name Product: The show Alphys loves to watch, Mew Mew Kissy Cutie, is almost certainly a reference to Tokyo Mew Mew.
  • Blank Stare:
  • Blank White Void: Inverted. The area of the Photoshop Flowey fight, the area the player talks to restored Asriel, and the game after you destroy the world on the Genocide Route are black voids.
  • Blatant Item Placement: Any item not given by another character is this. Weapons and armor are justified (they belonged to the previous humans, though we still don’t know how they’re still lying around after so many years), while other cases like Astronaut Food make no sense.
  • Blatant Lies:
    • While the rest of it is technically true, the in-battle description for Sans also calls him "the easiest enemy". Said boss opens up with a wave of hard-to-avoid attacks, making the lie seem obvious.
    • During a True Pacifist ending, Toriel pretends to be Sans in one of her texts to get back at him for writing down something she didn't say. Her use of polite language, proper capitalization, and the word "greetings" gives her away even before Sans manages to wrestle the phone away from her. Similarly, Sans's "imitation" of Toriel is obviously not her, either. He's given away by the lack of capitalization and spelling.
  • Bleak Level:
    • The True Lab. Its only residents are Alphys and a mysterious new class of enemies, the color scheme is dull and dark, and it provides exposition about Alphys's first experiments, Flowey’s origins, and the past of the Dreemurr family, all of which are… not lighthearted.
    • The entire game becomes progressively bleaker and bleaker on a No Mercy run, and it's especially noticeable if you've done a less murderous run earlier. The point when it really begins to show is Snowdin Town; the normal run town is the most populated area in the game, but it's almost entirely abandoned in a No Mercy run (apart from Monster Kid), and most of the flavor text has been changed to be much darker.
  • Blessed with Suck: The power to SAVE. On the one hand, nothing can ever defeat you as long as you keep trying, none of your actions have consequences, you can do literally everything possible eventually, and you’re essentially immortal. On the other hand, a large toll is taken on your sanity, and if you took the powers from someone else, they have Ripple-Effect-Proof Memory and become the only thing you can’t control, all the while trapping everyone else in the world in a Cosmic Horror Story, possibly damaging their mental state as well (as seen with Sans).
  • Blob Monster: Moldsmal and its larger cousin Moldbygg are basically living Jell-O molds. They're described as "curvaceously attractive" and loves some sexy wiggling, though the larger variant is more shy and prefers being left alone.
  • Block Puzzle: Parodied. There are two of these in the Ruins, and one of them has a rock with a mind of its own, and the player has to convince it to move onto the button.
  • Bloodbath Villain Origin: A Genocide Route starts out like this, with the player being required to track down every Random Encounter in the Noob Cave and kill them.
  • Blood from the Mouth:
    • Seen only on a No Mercy run after dealing the lethal blow to Sans, though it might actually be ketchup.
    • If you kill Toriel in a genocide run or when her guard is down, a dark line is seen running from her mouth to her chin. It's still monochrome unlike the above example, so it's not as clear exactly what it's meant to be, but the imagery is still there.
  • Bloodless Carnage: Monsters turn to dust when killed, so no blood is spilled. Subverted (or Averted, depending on player interpretation) once in the No Mercy run, as mentioned above. There is some evidence to suggest that monsters shed blood when injured prior to turning to dust, however, as also noted above, but since the only example we see is from a Boss Monster — a very powerful kind of monster with unique biology even by monster standards — nothing can be said for sure.
  • Blue-Collar Warlock: Theoretically, many monsters, since they all seem to be spellcasters.
  • Blue Means Cold: The Slippy-Slidey Ice World called Snowdin, which has a somewhat blue theme.
  • Blunt "Yes": If you complete the No Mercy path and destroy the world, a certain character will suggest that you think you're above consequences. You get a yes/no prompt to this — if you answer "yes", not only are you engaging in this trope, but they'll give you one right back.
  • Blush Sticker:

    Trope Bo 
  • Body Horror: Shows up very late in the game.
    • Photoshop Flowey — equipped with four eyes, vertically aligned teeth, a TV screen that alternates between showing Flowey's own dementedly-grinning face and a horribly distorted human head, and pipes that resemble intestines coming out of his body.
    • Each of the Amalgamates in the True Lab are multiple monsters fused together into a single wretched abomination with traits of each of their component monsters mixed and matched in grotesque ways — one monster's entire head is the eye of one of them. They're the end result of Dr. Alphys's attempts to inject monsters with Determination gone horribly wrong.
    • An earlier example that foreshadows the Amalgamates: If you kill Undyne in a Neutral run, she keeps going for a while, but her body slowly distorts, eventually melting before finally turning to dust. Naturally, she has more Determination than any other monster; this same Determination combined with a lack of doubt about the player's motivations is what causes her to become Undyne the Undying in the Genocide run. The transformation is unsuccessful in a Neutral run; likely, this is because she's not completely sure that the player is actually and wholly evil.
  • Bold Inflation: There are some words, like FIGHT, that the game likes to randomly capitalize. EXP and LOVE are explained, but we don’t know what’s up with the others.
  • Boléro Effect: “NGAHHH!!”, “Spear of Justice”, “Finale”, “His Theme”, and “Battle Against a True Hero” all have this.
  • Bomb Disposal: Mettaton has a minigame based on this where you must dispose of a variety of bombs disguised as other objects within two minutes — if you fail to defuse all of them, he warns you that another, much larger bomb will explode.
  • Bond Villain Stupidity:
    • If you lose to Papyrus, he will capture and imprison you… in an unlocked shed next to his house, with bars large enough for you to walk through the only thing blocking the way out.
    • Mettaton repeatedly leaves you to go free after you succeed at his various challenges (his quiz show, retriving the cooking ingredients for the cooking show, and defusing the bombs), even though he's completely invulerable and could easily defeat you in a straight fight. This is because he never intended to actually kill you.
    • When you reach the royal castle and encounter Asgore, he freely allows you to leave and restock on supplies before your battle with him, even though he has ample opprotunity to attack you when your guard may be down after hearing the story of the first fallen child. He would really prefer not to kill another child, and wants to put off his battle with you for as long as possible.
    • Flowey is a Sadist who loves seeing you squirm before he kills you. In the case of Photoshop Flowey, he literally never kills you because he's having too much fun locking you in a "Groundhog Day" Loop of painful death.
  • Bonus Feature Failure:
    • Sleeping can bring your HP above its maximum, which the game plays up as something important. However, this does not show up enough for most people to remember it at all (you can only sleep at the inn in Snowdin and MTT Resort), and when it does, people are intimidated by the very steep prices.note 
    • Punch Cards are items that give you a “buy three, get one free” policy with the Nice Cream Guy. Most people don’t have the inventory space to fit both the Nice Cream and the Punch Cards, plus it’s just not worth it for most people to spend all their money on food items when the game has been relatively easy up to this point. Punch Cards also have a feature where you can use one during a fight as a weapon in tandem with the Tough Glove to boost your attack ("punch") strength, which is an even more obscure ability which most people likely don't know about.
  • Bonus Stage: The Temmie village in Waterfall can only be accessed by a pathway that initially doesn't show up when you light your way through a black room, and which many players will never find on their first playthrough. Inside are a comedic group of NPCs to talk to, as well as the only shopkeeper in the game that you can sell your unwanted items to if you need extra cash and who sells the best possible set of armor in the game.
  • Bonus Stage Collectables: This is the main way the Player Character finds new weapons and armor (and occasionally high-level food items).
  • Book and Switch: Implied and parodied. In Sans and Papyrus' house, you can find a joke book that has a quantum physics book inside of it, which has a joke book inside of it, which has a quantum physics book inside of it…
    You decide to stop.
  • Bookcase Passage: On the console and Switch versions, the Dog Shrine is accessed through a secret passage under the sink in Sans & Papyrus’ house.
  • Bookends:
    • Both the first level and the Neutral endings conclude with you walking into a doorway, leading to a fade to white before cutting right to the game's title.
    • The last room of the first level is identical in appearance to the first one, with the same character commenting on the choices you've made since you met them at the start of the game. In the demo, this was the last room in the game. A third copy of it is the last room in the final game, too.
    • At the beginning of the game, Toriel takes you to her house in the Ruins. It's a quaint little house with three bedrooms, one of which is locked off. At the end of the game, you reach Asgore's domain, an identical house called New Home. It also has three bedrooms; the room that was Toriel's is locked, and the room in Toriel's house that was locked is Asgore's. This visually demonstrates the relationship between Asgore, Toriel, and their children.
    • Near the end of the Pacifist run, Toriel knocks Asgore away in the same way she knocked away Flowey in the beginning of the game. She even gives the same line of dialogue about a miserable creature torturing an innocent youth, which tells you exactly how she feels about her ex-husband…
    • Both at the start of the game and in two different endings, Frisk is saved from an unavoidable-ring-of-bullets attack by the last-second intervention of a third party.
    • If you backtrack to the beginning after sparing Toriel, she tells you "Don't worry about me… Someone has to take care of these flowers." If you backtrack to the beginning after sparing Asriel, he tells you the same. The reason for this is that the First Child's dead body is buried under these flowers.
    • The very last chords of "Bring it In, Guys", the theme for the ending credits, are the very first chords from "Once Upon a Time", the first song you hear upon starting the game. Subverted when it gets interrupted and you get more credits with a different song, and then Double Subverted when the ending of that song is another reprise of Once Upon a Time on the piano.
    • You can pull an I Surrender, Suckers on the first boss, dealing a One-Hit Kill. On a No Mercy run, the final boss can pull the same trick on you, to the same effect.
    • The first formal encounter, Froggit, is the last enemy to see you off at New Home. He's also the first one to tell Asriel's tale.
    • The end of the pacifist True Final Boss battle is a callback to the end of the Toriel battle, the first major boss. It reuses that boss's final "attack", and then there are several rounds of you selecting the same command while the boss talks instead of attacking you.
    • The first weapon you can find is a Toy Knife. On a Genocide Run, the last weapon you can get is the fabled Real Knife.note 
    • The first time you meet Sans is on a long straight silent trail where he initially uses the huge trees to remain unseen, and he's completely shaded over until he reveals his identity. The last time you meet him on a neutral or genocide run is in a long straight silent hall where he initially uses huge pillars to remain unseen, and he's completely shaded over until he reveals his identity.
    • When you first go to sleep in Toriel's house, you will find a slice of pie on the floor upon waking up. In the Pacifist ending, if you decide to stay with Toriel, The Stinger will show her sneaking into your bedroom at night, leaving a slice of pie on the floor.
  • Books That Bite:
    • In the Ruins, there is a Block Puzzle where one of the rocks is sentient, and you must convince it to move onto the pressure plate.
    • Vegetoids and Moldsmals are living carrots and gelatin, respectively.
    • The Mad Dummy is a training dummy possessed by a ghost.
    • In Hotland, we have Vulkin and Tsunderplane, who are respectively a mini-volcano and a plane.
  • Bookworm: Downplayed with Toriel and Alphys. While reading isn’t the primary thing they do (Toriel enjoys cooking and bug-hunting, Alphys loves to watch Anime), they still seem to greatly enjoy reading and both have more than one bookshelf in their homes (both of them live alone).
  • Boom Town: Implied. The Punk Hamster offhandedly mentions that monsters from New Home are coming to Snowdin due to overpopulation problems, but we don’t know how much exactly.
  • Bootstrapped Leitmotif:
    • The Ruins theme is a lot more commonly associated with Undyne than its original context. Rearranged versions are also used for the general Waterfall and Hotland themes and a few cutscenes, with Snowdin being the only notable exception.
    • "sans." tends to show up whenever something humorous or lighthearted occurs, like during the prelude to Papyrus's 'date' and the Blook family farm scene.
    • "Dogsong" is generally associated with dog monsters, namely Greater Dog and the Annoying Dog, but considering the latter's attitude and the song's use after Sans pulls his I Surrender, Suckers, it's also gained association with trolling-related moments.
  • Border-Occupying Decorations: There are several border options on consoles, thanks to the game using a 4:3 display as part of its retraux aesthetic. The dynamic option switches it based on the location the player character is in. There are also several optional borders unlocked for doing specific tasks, but those depend on the version.
  • Boring, but Practical:
    • In a Pacifist run, the healing items you can get in early areas like Snowdin can fully heal your lower health bar, and are cheaper than some of the fancier stuff later on. Bisicles are especially nice, since they have two uses, which helps bypass your limited inventory.
    • On the No Mercy run, you'll be one or two-shotting literally everything anyway, with one exception, and the Real Knife is functionally pointless by the time you reach it. The only weapon that's particularly worth your while after Undyne the Undying is the humble Burnt Pan, since it grants a slight bonus to HP gained from food, and you'll need a lot of food for fighting Sans.
    • The Burnt Pan is also more useful than later weapons for Pacifist and True Pacifist runs for the same reason, since you won't be using it to attack, anyway. It, along with the Stick and Torn Notebook, are the only weapons that have a use for something other than fighting.
  • Boring Return Journey: This often pops up when backtracking, even with all the shortcuts. The worst case of this comes in the Playable Epilogue of the Golden Ending: there’s a secret in the very first room of the game. While getting there is entertaining since you can get new dialogue by revisiting the NPCs, getting back is another story. Even with the shortcuts, you have to walk through the entirety of the Ruins and Snowdin Forest, and then some. Even Toby Fox says that he should've added a run button.
  • Born of Magic: Monsters are described as having bodies mostly made of magic, as opposed to humans', which are mostly made of water. Descriptions of how monsters have children is not explicitly explained, but it is implied that the process is more magical than biological. Given the previously stated information, that may make little difference from a superficial point of view, but who knows?
  • Born Winner:
  • Boss-Altering Consequence:
    • Most bosses in general can be killed normally, but the game encourages you try and befriend them by getting to know them and finding out what they like. Each boss is unique in how you accomplish this, and you can go through the entire game without killing a single boss.
    • If you purchase an item from the Spider Bake Sale, and use it during the fight with Muffet, then she will receive a telegram telling her of your purchase, and she will be pleased by your support, and you can end the fight by sparing her.
    • When fighting Undyne in the Neutral or Pacifist routes, a couple of the available Acts will affect the speed of her attacks. You can challenge her, which will make her attacks faster, or plead with her, which will slow them down. Both of these will stack, up to a point, if done multiple times.
    • Your decision in rescuing Monster Kid after they slip off of a bridge in Waterfall will affect Undyne's health; should you rescue them, Undyne will have full HP in the boss battle. Should Monster Kid fall, Undyne will rescue them, but at the cost of some of her HP.
    • If you eat the pie that Toriel gave you at the beginning of the game while fighting Asgore, the smell will remind him of her and reduce his stats.
  • Boss Banter: Many bosses are fond of talking to you during their battle (as are regular enemies, for that matter), but the final bosses of each of the routes fit best. The neutral one gloats about killing you and your friends, while the other bosses sound more like they're ranting on their personal soapboxes than trying to kill you.
  • Boss Bonanza: The endgame of a Neutral/True Pacifist Route. At the end of the CORE, Mettaton EX is fought. After beating him, you move onto New Home, where you get numerous plot revelations before fighting Asgore. Once he goes down, Flowey returns, hijacks the entire game, and turns into the Final Boss of the Neutral Route. If no one has been killed prior to Asgore, you can reload the save file and, after some backtracking and a few events, enter the True Lab, where you fight five tough Amalgamates. After escaping, Flowey becomes the True Final Boss, Asriel Dreemurr.
    • The endgame of the Genocide Route still counts by technicality, with a series of encounters consisting of Mettaton NEO, Flowey (who just talks to the player), Sans, Asgore, and Flowey. However, Sans is the only boss in the lineup who isn't a Zero-Effort Boss under these circumstances.
  • Boss Corridor:
    • The Last Corridor (so named by the Save Point there) is a stately hallway bathed in gorgeous yellow light which obviously leads the player straight to the final encounter with the king. However, one dialogue occurs in the middle of this corridor, and it includes a major reveal. On a Genocide Route, the Final Bossnote  Sans is fought in the corridor itself.
    • There are small hallways before the fights with Toriel and Mettaton EX/NEO.
  • Boss Dissonance: For the most part, the Genocide Route is very easy. There’s a certain point where the player’s LOVE is high enough to One-Hit Kill most enemies, which ironically means the only place on the Genocide Route where common Mooks pose a challenge is the early Ruins when you haven’t built up a lot of EXP. However, the route’s two bosses, Undyne the Undying and Sans, are extraordinarily difficult and unforgiving, far more so than even the True Final Boss of the Pacifist Run.
  • Boss-Only Level: There’s a few areas that qualify, to various extents:
    • Toriel's Home has no one inside except Toriel and the player. This qualifies because Toriel is fought in her basement.
    • New Home is a much larger area, with no fights before Asgore Dreemurr. There are, however, a number of "fights" where the monsters do not attack; the "fights" are solely there to provide exposition. This trope is played differently in a True Pacifist Route; there, you only fight one boss (Asriel Dreemurr) but briefly encounter Asgore before Toriel attacks him, followed by all other monsters, including bosses, briefly appearing. Meanwhile, in a Genocide Route, there are technically two bosses (Sans and Asgore), but the latter is defeated in a cutscene with no player effort.
    • After Flowey takes the human souls and becomes Photoshop Flowey, nothing exists except Flowey and the player, as Flowey destroyed it all.
    • In addition, every boss (and many unique monsters) are encountered in rooms without other encounters. Muffet is a notable example, due to both the length of her boss room and the presence of a room before it, clearly associated with her and possessing no random encounters.
  • Boss Remix: Several bosses have remixed versions of their overworld theme as their boss theme.
    • "Bonetrousle" is a remix of Papyrus's "Nyeh Heh Heh!"
    • "Dummy!" is a remix of a previous boss fight theme, "Ghost Fight". "Spider Dance" has bits of "Ghost Fight" in it as well, since Muffet is only fighting you due to Mettaton's interference.
    • "Spear of Justice" is a remix of Undyne's "NGAHHH!" Also, faster-paced remixes of "Ruins" and "Waterfall" are in "Spear of Justice".
    • "Death By Glamour" is a remix of "The Core" combined with Mettaton's "Metal Crusher" and "It's Showtime".
    • "ASGORE" is a remix of "Determination", Asgore's "Bergentrückung", and Toriel's "Heartache".
    • "Your Best Nightmare" contains Flowey's "Your Best Friend" during the SOUL attacks. It's replaced with "Finale" once the tide turns in your favor, which is also a remix of "Your Best Friend", and has a remixed "Memory" in the background during parts of the song.
    • "Hopes and Dreams" and "SAVE The World" both contain the main Undertale theme, "Your Best Friend", and "Memory", which turns out to be Asriel's own theme.
    • Most boss themes (excluding that of Snowdin) are remixes of their respective area's overworld theme. They're all based on the same theme, yet are all so extremely distinct as well as perfectly aligned with the tone, mood, and characters that they represent.
    • A track titled "Song That Might Play When You Fight Sans" is a remix of Sans's theme, "sans." with a few bars from "Bonetrousle" and, if one listens carefully, Gaster's Theme. It was left out in favor of "Megalovania".
    • Inverted with "Dogsong", which is played during the fight with the Greater Dog — although it isn't particularly ominous to begin with and it's actually a sped-up remix of the normal battle theme. It's slowed down and played with (somehow) sillier instruments to become the theme for the Tem Shop in Temmie Village.
  • Boss Room:
    • Toriel’s battle takes place in her ominous basement with a Big Door with the Delta Rune on it at the end of a Boss Corridor.
    • While we don’t get to see it, the Boss Fight with Mettaton EX takes place onstage with a huge crowd watching the fight, which is also being broadcast on the MTT channel.
    • Asgore, Photoshop Flowey, and Asriel Dreemurr are fought at the barrier between the Underground and the surface.
    • Undyne the Undying is fought on a bridge in the caverns of Waterfall. Undyne's non-Genocide battle takes place outside and within a cavern just beyond that bridge, which itself leads into Hotland.
    • Sans’ battle takes place in the Last Corridor, a large, dramatic hall with pillars, and windows with the Delta Rune on them filling the room with golden light.
  • Boss Rush: Downplayed toward the end of the True Pacifist route. During the battle with Asriel, you must "save" the SOULs of the major cast, which means refighting them for three or four turns each.
  • Boss Subtitles: The only boss with this is the True Final Boss. Justified, since Asriel is still at the maturity level of a child when given the power of a god; everything he does in this form is his version of Rule of Cool.
  • Boss's Unfavorite Employee: In addition to being a major celebrity, Mettaton also manages a resort. He's generally a Benevolent Boss to the resort's employees… except for Burgerpants. He made an entire album purely dedicated to telling Burgerpants how bad at his job he is.
  • Boss Tease: Throughout Waterfall, the Player Character is chased by an ominous figure in armor with a single glowing eye. Undyne is encountered several times, and each time is rather stressful, but you always barely get away before a full-out duel begins. Finally, at the end of the area, Undyne takes off her helmet, and the hardest battle in the game up to that point begins.
  • Boss Vulnerability: Of the Wait Them Out variety. You can only attack an enemy on your turn, and only one attack at a time (with one exception).
  • Boss Warning Siren: During the Final Boss of the Neutral Route, Photoshop Flowey, a warning siren will sound before Flowey uses the special attack of one of the six human souls.
  • Botanical Abomination: At the end of the Neutral route, Flowey the Flower gains the power of the human souls and becomes an enormous, omnipotent beast called Photoshop Flowey. This form combines plant-like features with machine parts.
  • Bottled Heroic Resolve: Determination is this for monsters that have the willpower to handle it. However, the monster will eventually melt, meaning determination is a last resort for them. We see this on the Genocide Route when Undyne becomes Undyne the Undying.
  • Bottle Episode: Ironically, despite being the capital, New Home is the emptiest location in the entire game, featuring only a linear white path through Asgore’s home and only three true enemies (and only one or two of them will attack you in any given run).
  • Bottomless Bladder: Justified with monster food at least, since monster food dissolves into pure energy and does not go through the excretory system (monsters don’t even know what a bathroom is), although we don’t know how much the player character ate before the events of the game.
  • Bottomless Pits: There are several of these in the game. However, the Player Character refuses to go off the edge.
  • Bottom of the Barrel Joke: Sans pranks the human with a whoopee cushion twice. However, these still work surprisingly well with the individual scenes, given Sans’ immature sense of humor. Exaggerated with Sans’ “passwords” to confirm you’re a time traveler.
  • Boy Meets Ghoul: Downplayed. The Player Character can “date” Papyrus, a living skeleton, though it doesn’t go anywhere.

    Trope Br-Bu 
  • Bragging Rights Reward:
    • The Real Knife and The Locket grant stat boosts of 99 to ATK and DEF, but you'll have no real use for them because by that point of the No Mercy path, the only enemy left renders your stats pointless. This ties with the game's themes of guilting the player for their destructive actions, as they could very well drive things that far just for the sake of power growth and the satisfaction of seeing the Real Knife fan rumor become truth.
    • Getting to the LV cap of 20 requires killing every single random encounter and every boss. By the time you're at 20, there's no more enemies where you can benefit from it, as the last boss you encounter is killed automatically.
  • Brainless Beauty: Moldsmal’s battle description is a reference to this trope. note  Made even funnier since this monster you can flirt with is a Blob Monster.
  • Brains and Brawn: Alphys is short, chubby, and a Gadgeteer Genius who never fights the player and evacuates the monsters on the Genocide Route. Undyne is tall, muscular, and a very confrontational Action Girl who will confront the Player Character directly on all routes of the game. However, Undyne is still fairly smart and Alphys is rather scatterbrained.
  • Brainwashed:
  • Brainwashed and Crazy: In the final battle of the Pacifist route, Asriel captures the SOULs of the six main NPCs (Toriel, Sans, Papyrus, Undyne, Alphys, and Asgore) and erases all their memories associated with you. This makes them attack you blindly, and it's up to you to bring them back.
  • Brand Names Are Better: Everyone is obsessed with Mettaton and his brand, and Undyne refers to her stove as “some top-of-the-line MTT thing.” It’s strongly suggested that the reason for Mettaton’s success is that he doesn’t have any competition. He’s the only true brand name in the underground (except for the junk in the garbage dump).
  • Breaching the Wall: The magical seal keeping everyone in the underground is broken in the Golden Ending.
  • Bread and Circuses: In the ending where you kill Toriel and Undyne but not Mettaton, he becomes president of the underground and establishes an Egopolis by brainwashing everyone with his TV show.
  • Bread, Eggs, Breaded Eggs: In the Golden Ending, Undyne will ask Alphys if they can watch an anime together about fighting, or princesses, or fighting princesses.
  • Bread, Eggs, Milk, Squick: The Spider Bakesale's advertisement in the Ruins. "Come eat food made by spiders, for spiders, of spiders!"
  • Breaking the Fourth Wall:
    • Characters vaguely remember you on subsequent playthroughs and may comment on how things transpired the previous time. The player can even reference having died before against certain bosses or having killed certain bosses on previous runs.
    • Getting the No Mercy ending again after getting it the first time will result in a massive session of Leaning on the Fourth Wall. The First Child discusses the nature of leveling up in RPGs and getting stronger through murder. The game very heavily implies that the First Child is a representation of the player to some degree: an absurdly strong, invincible entity that is summoned into a game as your pawn, allowing you to reset the world and mess around with its inhabitants to your liking with the ability to perform resets (read: New Game) and endless retries (read: Saving and loading).
    • The Neutral ending you'd get if you somehow did not meet any of the requirements for the other endings involves Sans directly calling the player just to tell them to file a bug report (unless you've hacked the game to deliberately trigger said ending).
    • If you call Papyrus and Undyne at the place where you first fought Undyne, they'll directly refer to their battles as "boss fights" when considering making a scrapbook.
  • Breaking the Glass Ceiling: The Player Character is the first human to survive being hunted by Asgore, though this is less pure skill (though that is also a factor) and more being an immortal time-traveller.
  • Break the Badass:
    • For most of the Ruins, Toriel is established as a powerful figure, blasting away Flowey with one hit, and the other monsters are clearly intimidated by her. However, once you mention that you want to leave the Ruins, Toriel becomes dead serious, resorting to attacking a child with fire magic in order to keep them from Asgore.
    • In one Neutral ending, Undyne has lost all motivation and is implied to be suffering from severe depression after losing her job, her house, and Alphys.
  • Break Them by Talking: In addition to being broken physically and psychologically, you're constantly on the receiving end of this during the final battle of the Genocide route. Theirs is a particularly penetrating example as Sans uses his greater scope of the world he lives in to speak to the player (whether it's directly or indirectly is up to interpretation), and he clearly understands what kind of person you must be if you made it this far without turning back.
  • Break-Up/Make-Up Scenario: An interesting variation in that it’s between mother figure and child rather than friends or love interests. Toriel quite happily welcomes the Player Character into her home and is very eager to raise and educate the child herself. However, the Player Character insists on leaving, and after her boss battle, Toriel asks the human not to come back to the Ruins, and she doesn't answer any phone calls afterward. Thankfully, in the Golden Ending, Toriel returns and makes amends.
  • Breast Attack: Undyne's injured sprite when dying shows the cut hitting one of her Non-Mammal Mammaries; however, this is likely not deliberate.
  • Breather Episode:
    • After the dramatic Boss Fight with Toriel, the next area is Snowdin, which is arguably the funniest part of the whole game.
    • After the more serious arc in Waterfall, the next area is Hotland, which is mostly shenanigans with Alphys and Mettaton.
    • If the player goes for the Golden Ending after completing a Neutral Route, they face the tragic fight with Asgore and the terrifying fight with Photoshop Flowey, followed by a silly date with Alphys.
  • Brick Joke: Has its own page.
  • Brief Accent Imitation: While it’s debatable if you could call it an “accent,” Sans briefly tries to imitate Toriel’s Voice Grunting during his meal with the Player Character at MTT Resort.
  • Bright Castle: Played with with Asgore’s castle. The castle looks almost empty from its viewpoint in Waterfall due to the shading, especially since it’s underground. When one actually gets to the castle, it’s a muted grey Beautiful Void that feels rather hollow. One could even call it unnerving, especially on the Genocide Route.
  • Bright Is Not Good: The main villains of the game are this. Flowey has bright yellow petals, and his Photoshop form isn’t a slouch on bright colors either. The other villain, the Fallen Child, wears a bright green and yellow shirt at the end of the Genocide Route as they discuss slaughtering everyone for power.
  • Bringing in the Expert: Subverted. Alphys was originally going to do this with Mettaton to stop the Player Character, but...
    Alphys: Watching somebody on a screen really makes you root for them.
  • Broken Aesop: Cleverly defied in the Playstation 4/Vita version with the Trophy system. Undertale is a game that constantly lampoons the 100% Completion trope to no end, especially in Flowey's speech in the Genocide route, and has a general aesop on you having control over your own actions, but since Sony requires every game from PS4 onwards to allow the players the ability to earn trophies, most of them are either story-mandated (simply reach the area in normal gameplay) or out of the way and add literally nothing (the Dog Shrine exclusive to the Playstation versions).
  • Broken Armor Boss Battle: The player cannot harm Mettaton until they flip his switch to change him into his EX form.
  • Broken Bird:
  • Broken Bridge:
    • The Mysterious Door in Snowdin Forest. You open it by completing the Bullet Hell section of the credits of the True Pacifist Route.
    • Sans’ room and the locked door behind the Skelebros’ house. Sans gives you the key to his room if you use saves to see his judgement four times on a Neutral Route with no EXP. The key to the back door is in his room.
    • The pink house next to Napstablook’s home in Waterfall. You can buy the key from Bratty and Catty in the dark alley by MTT Resort.
  • Broken Smile:
  • Broke the Rating Scale: In-Universe. Checking Temmie reveals that, instead of having ATK and DEF scores, she's just "RATED TEM OUTTA TEM". The Mad Dummy also breaks the scale by having a DEF score of "YES".
  • Brought Down to Normal: Both the Player Character and Flowey lose their Save Scumming to each other at a few points in the story, leaving them as normal beings. However, both can still kick butt.
  • Brown Note: The Greater Dog attacks with his barks, Shyren attacks with her singing, and the Temmie pets the human (who is allergic to them).
  • Bruiser with a Soft Center: Undyne is a classic example. She constantly wears her heart on her sleeve, monologuing about how “[she] can feel everyone’s hearts beating as one” and how she will defend the monsters’ hopes and dreams. She is especially affectionate to her friends. She’s Papyrus’ surrogate sister and is shown to care very deeply about the rest of her guards as well. And, of course, the crowning jewel is her romance with Alphys.
  • Bubblegloop Swamp: Waterfall. Downplayed, as there are established paths through the area, so the player doesn’t really have to deal with the actual “swamp” part of the area.
  • Buffy Speak: Sans calls Papyrus's fence in Snowdin Forest a "gate thingy".
  • Bug Catching: Implied. Toriel offhandedly mentions wanting to show the Player Character her “favorite bug-hunting spot.”
  • Bulk Buy Only: In order to get more Dog Salad, the Player Character must also fill their inventory with Dog Residue.
  • Bullet Dodges You: If you’re at 2 HP, Toriel’s attacks will deliberately miss, as she doesn’t want to kill you.
  • Bullet Hell:
    • Enemies attack with bullets of varying shapes and patterns. Battles with multiple enemies can become hectic.
    • Beware that some of the attacks will come from out of the square your heart is in.
  • Burger Fool: MTT-Brand Burger Emporium, even down to the mandatory slogans. Management is incompetent in several respects and outright Sadist in others, alternatingly micromanaging and operating entirely on whims. The leitmotif is the same pitched-down version of "Shop" you'd hear in other stores during a No Mercy run, no matter which end you go for.
  • …But He Sounds Handsome: If you type "Toby" in the essay question during the Mettaton EX battle, he responds "Toby? What the hell is that? Sounds... sexy."
  • But Thou Must!:
    • Played straight a lot (all options during the "date" sequences will lead to the same outcome, along with many other places). But also parodied in many other places.
    • With the exception of the very first (whether you think Junior Jumble or crosswords are tougher), all of the many dialogue options with Papyrus will lead to the same result of him taking what you said/did as a compliment and liking you even more. This fits perfectly with his personality, as his ego, idealism, and naivety combined make him interpret you as a naturally nice person somehow complimenting him, even if you say things like "What a loser" to him (he thinks that you're calling yourself a loser, and then encourages you to think better of yourself).
    • When you're on the "date" with Alphys, she asks you how she can work up the gall to tell Undyne the truth. Your two response options are, "Let's Roleplay It," and "Obviously Let's Roleplay."
    • During Mettaton's quiz:
      Would you smooch a ghost?note 
      A) Heck Yeah
      B) Heck Yeah
      C) Heck Yeah
      D) Heck Yeah
    • During the Undyne date, when she asks you to pick something to drink, one of the options is labeled "Blatantly correct choice". No other option will actually advance the scene.
    • When you talk to him in the epilogue, Mettaton asks you for your opinion on a list of merchandise, but when he's done listing them, it just says "a yes or no prompt was not provided".

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