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Characters / Undertale - Other Characters

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Top Index | Major (The Human Child, Flowey, Toriel, Sans, Papyrus, Undyne, Alphys, Mettaton, Asgore Dreemurr) | Minor | Monsters | Spoilers
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i'd just weigh you down.

A humourless ghost monster who is good at pretending to sleep and sound mixing.

  • Accidental Hero: Napstablook comes in to break up the stalemate between you and the Mad Dummy... if only by complete accident. Later on, their call to Mettaton inadvertently convinces him that you shouldn't be killed.
  • Achievements in Ignorance: In the True Pacifist ending, it's revealed that they escaped Asriel/Flowey's absorbing of every monster soul in the Underground simply by closing their blinds.
  • all lowercase letters: Napstablook's lines are always written in lowercase letters, with no punctuation other than a miserable set of ellipsis at the end of a sentence...
  • Ambiguous Gender: Only called "they" by other characters, even in their cousin's diaries. Toby Fox did refer to them as "he" once in the original version of the art book, but this was edited after a fan backlash.
  • Apologetic Attacker: Napstablook inverts this trope, as they apologize for not attacking you, due to them "really not feeling up to it right now."
  • Apologises a Lot: When they feel like they've inconvenienced you, which is a lot of the time.
    Grey Attack: Really not feeling up to it right now. Sorry.
  • Bedsheet Ghost: In terms of appearance, since they have no feet and resembles a sad Pac-Man ghost. Amusingly, Naptsablook is described as an actual ghost monster, meaning that their visible form looks like a stereotypical ghost because that's just how monster ghosts look.
  • Break the Cutie: If Mettaton's diaries are any indication, they've been depressive since their cousin decided to leave the Snail Farm to become a training dummy. Made even worse for them when Mettaton leaves the farm himself to become a celebrity. Tellingly, the player is the only person who is willing to be friends with them. (Undyne tried, but her Hot-Blooded personality was, by her own admission, a bit too much for Napstablook.)
  • Catching Some Z's: Napstablook repeatedly says "z" over and over to make you leave them alone. It doesn't work. The characters do all genuinely go "zzzz" when they sleep, though. The joke is that in Napstablook's case, the textbox actually spells out that the ghost literally is saying "z" instead of acting believably asleep.
  • Chekhov's Gunman: They start out as a simple random mini-boss, and completely leaves the story after that. Until they end up saving you from the Mad Dummy. Later on, they also accidentally help you Spare Mettaton, and turns out to have a major connection to him.
  • The Eeyore: Unless the protagonist makes an effort to cheer them up. And even then, it doesn't last long. They're generally in an endless downer mood, to the point their favorite activity after meals is to just flop on the floor and feel like trash for hours.
  • Foreshadowing: Minor example during their fight, should you try to kill them, notice how they don't flinch upon taking an attack. Continue to attack, and they reveal that ghosts can't be killed that way, and they were only lowering their HP to be polite.
  • Headphones Equal Isolation: Big blocky ones.
  • Hidden Depths: If the protagonist flirts with Napstablook in response to their 'Dapper-Blook' trick, their only response is "oh no...", implying that either Napstablook thought their attempt to amuse the Human Child went a little too well, or that they're slightly uncomfortable with being flirted with.
  • Leitmotif: "Ghost Fight", which later gets downplayed into "Pathetic House" when you meet up with them again later.
  • Medium Awareness: They're able to read the in-battle menu boxes, as shown if you Check them.
    Check Description: This monster doesn't seem to have a sense of humor...
    Napstablook: oh, i'm REAL funny.
  • Mini-Boss: They block the player's progress forward, and engaging them in battle is the only way to get past... unless you're on the "No Mercy" route, in which case they'll immediately disappear.
  • Nice Guy: A bit overly-passive and gets in your way briefly, but all in all, they're very friendly and inviting. And when you try to kill them, even though you can't? They lower their HP on purpose just to be polite.
  • Nice Hat: They cry themself one, a tiny little top hat made of their own tears. They call it the Dapperblook look.
  • Nigh-Invulnerability: Because they're incorporeal, they can only ever be harmed because they lower their own health bar in order to be polite.
  • No-Sell:
    • When Flowey absorbs the souls of the entire monster population to become Asriel, Napstablook just closes the blinds of their windows to avoid the large flash of light outside and keeps themself busy with music.
    • Also, if you try to kill them, they reveal that they're completely immune to your attacks and were only lowering their own health bar to be polite.
  • Not So Harmless: If you cheer Napstablook up until they display their "dapper blook" look, but then fail to cheer them up again (flirting with them does much the same thing as cheering them up in this case, changing only their immediate reaction), they burst into tears and start unleashing barrages of projectiles that could put Touhou Project bosses to shame. Do not upset Napstablook, it'll be the last thing you do. Not to mention that they're completely unkillable.
  • Punny Name:
    • While they're first encountered pretending to sleep on the ground, their name also sounds like Napster, an old file sharing program. They're later revealed to be a DJ who uses another file sharing program to download music.
    • Napstablook also sounds a lot like "naps to block", which is exactly what they do in the Ruins.
  • Shrinking Violet: Napstablook is quiet, shy, socially awkward, and overly polite.
  • Skippable Boss: On the No Mercy path, Napstablook fades away as you approach their sleeping spot.
  • Slept Through the Apocalypse: When Flowey absorbs the soul of every monster, Napstablook doesn't even realize anything happened since they were at home with their blinds closed.
  • Spanner in the Works: When Mad Dummy realizes you can't hurt it and it can't hurt you, it decides to keep you in the fight forever by refusing do anything during its turn. Napstablook unknowingly halts the battle by coming in to say hi and driving Mad Dummy away with their tears.
  • Swiss Army Tears: They can both attack and form clothing with their tears.
  • Throw the Dog a Bone: In the True Pacifist ending, Mettaton decides to induct Napstablook into his new troupe, reuniting the cousins and letting them reach fame on the surface together.
  • Turns Red: If you don't cheer them up or flirt with them after they display their "dapper blook" look, their attacks get absolutely brutal and borderline undodgeable.
  • Villain Forgot to Level Grind: They're exactly the same on Hard Mode as they are in a normal game, despite almost everything else being stronger. Apparently, they "missed the memo and is the same difficulty as normal", as Check tells you.
  • Warm-Up Boss: Napstablook is the first enemy in the game whose attack patterns are legitimately hard to dodge even if you know what you're doing... but the pacifist way to beat them is very obvious, and if you do it right they'll only actually attack you for one round (being scripted not to attack on the second round of the fight or the turn before it ends). Also, they're a lesson about how bosses are harder to Spare than enemies are, while still being unkillable so you don't mess up a Pacifist run against them if you can't figure it out; no other boss except the Mad Dummy lets you off easy like that.

    Nice Cream Guy
It's the frozen treat that warms your heart!

A Nice Cream salesman who totes his cart to several places around the Underground as you travel. Business hasn't been booming, though...

  • Amazing Technicolor Population: He's a blue rabbit-like creature.
  • Break the Cutie: If you don't spare a mandatory encounter by killing the monsters involved, he will remain upset and hopeless about his business, since said encounter had the monsters buy all of his Nice Cream if they were spared.
  • Cannot Tell a Joke: According to Burgerpants, he thinks that the nice messages on his Nice Cream wrappers count as jokes.
  • The Ditz: He's not very good at thinking out his stand locations. The first is in an ice region, while the second is in a cave that's off the main path. The third location at least makes some sense, being in Hotland, but unfortunately he's put himself outside a fancy hotel that contains a fast food restaurant that sells name-brand frozen treats (MTT-brand Starfaits), past what would normally be the back entrance to the hotel (the main entrance being the side facing New Home), guaranteeing that the only people who would potentially visit would be people travelling to/from Snowdin or Waterfall (or who had business in Hotland proper), and didn't care about the MTT-brand products. Thankfully, sparing one of the major encounters means the third location actually works well for his business.
    • Finally averted in the credits, as he does the most logical thing and starts selling Nice Cream at a beach.
  • Dungeon Shop: His first two locations are located in the middle of Snowdin and Waterfall. The one at Hotland is past the point enemies spawn, so it doesn't count.
  • Everyone Calls Him "Barkeep": The only character that mentions him in dialogue simply calls him "the Nice Cream guy".
  • Foil: A cheerful guy despite his business failures, in contrast with Burgerpants, who is successful but loathes his job.
  • Intrepid Merchant: He seems to be following the same trail as you, though this means that he sets up shop in the worst places possible.
  • Nice Guy: To a point where it rubs off onto his products.
  • No Name Given: Never gives out his name, and nobody else mentions it. In Deltarune, an NPC working at the local P"E"ZZA restaurant who's implied to be him is referred to as "Blue Ears," but whether this is his actual name or merely a nickname is unknown.
  • Odd Friendship: With Burgerpants. Apparently, Burgerpants can't stand the Nice Cream Guy's lack of a sense of humor, but puts up with it because he gets free food out of it.
  • The Pollyanna: No matter how business goes, he's always willing to keep going. The only thing that can stop him is killing the Royal Guards.
  • Recurring Traveller: Appears in three different locations throughout the game to sell his wares.
  • Stepford Smiler: While he's definitely optimistic and shows a lot of emotion when he has a customer, it's easy to see how upset he is at his lack of success. Should you kill the Royal Guards, he'll drop the act entirely and become rather gloomy.
  • Throw the Dog a Bone: In addition to him being overjoyed when you buy his Nice Cream, sparing the Royal Guards will cause them to buy out his entire stock, encouraging him to stay in business.
  • Took a Shortcut: No matter how fast you go, he'll always be able to make it from mid-Snowdin to mid-Waterfall before you. Same thing goes for mid-Waterfall to the end of Hotland, though at least in this case the "shortcut" in question could be the elevator system.
  • Visual Pun: There's an American brand of ice cream called Blue Bunny.
  • You Are Better Than You Think You Are: The messages on the Nice Cream wrappers (that display when used) are very uplifting.


A quiet fire monster who runs Grillby's, a popular bar in Snowdin. Everybody comes to Grillby's.

  • The Bartender: He's the owner and bartender of Grillby's.
  • The Blank: His only facial features are his glasses; he doesn't even seem to have eyes.
  • Obsessive-Compulsive Barkeeping: His idle animation — almost his only animation — is him polishing a glass.
  • The Quiet One: Almost never speaks; a monster in the bar usually translates what he thinks Grillby means, but he admits he has no idea if he's anywhere close. In the True Pacifist Ending, he'll tell you that you did a "good job.", but that's about it.
  • Wreathed in Flames: It makes him stand out a bit in Snowdin.

    Monster Kid

A monster who follows you from Snowdin.

  • Accidental Hero: In the neutral/pacifist run, throughout the human child's trip through Waterfall, the Monster Kid frequently saves the human child from getting caught or killed by Undyne just by being at the right place at the right time.
  • Ambiguous Gender: Their gender is never stated in the game, since no opportunity for it to be revealed in a sentence ever occurs. Toby Fox did refer to them as "he" in the original version of the art book, but this was edited after a fan backlash. They also refer to themselves with the typically-male pronoun "ore" in the official Japanese translation.
  • Armless Biped: Appears to be this: they often trip but pull themselves back up without the use of arms or any other kind of appendage and if you don't pick up an umbrella during the rainy segment in the Waterfall, they remark that it seems that you can't hold one either. Their tarot card also shows them running through Snowdin holding a popsicle in their mouth.
  • Broken Pedestal: If you saved them from falling from the bridge, they say they do not think Undyne is that great anymore, and that they found themselves a new idol, likely Papyrus.
  • Character Shilling: They do this with Undyne, telling the player how cool and awesome and righteous she is constantly as you walk through Waterfall. Though it turns out to be true, the player may not initially agree since Undyne is trying to kill them at the time.
  • Chekhov's Gag: After every encounter, they will trip as they run off, to the extent where it becomes a Running Gag. This turns out to set up for them to fall off a bridge, barely hanging on to the edge near the end of the Waterfall. They survive because even if you choose not to help, Undyne will rescue them.
  • Comically Missing the Point: It takes them a remarkably long time to figure out that you are a human.
  • Go Through Me: If you save them on a Neutral/Pacifist run, they stand between you and Undyne and shakily states this trope word for word. On No Mercy, they stand in your way because they won't allow you to hurt anyone else.
  • Hero-Worshipper: Almost all of their dialogue is gushing over how awesome Undyne is. During the Playable Epilogue, they realize that Undyne might actually just be kind of a jerk, and starts gushing over Papyrus instead.
  • His Name Really Is "Barkeep": According to Toby, their name really is 'Kid'.
  • Improbable Infant Survival: In No Mercy, the fallen child attempts to kill them when they get in the way, only for Undyne to save them. But, given what happens at the end of every No Mercy run, they're probably not doing better than the rest of the planet.
  • The Klutz: They frequently trip and fall on their face, presumably because they don't have arms. In their tarot card artwork, they have a bandage on their head.
  • Look Behind You: If you've already seen their speech on No Mercy, this is how it is shortened on future attempts; they start their speech, but they turn around and say "What? Look over here? What for—" before the game goes to the battle screen for the Undyne fight.
  • Morality Pet: Their actions in a No Mercy run imply that they're trying to be this to the player character, still doubting claims of your evilness, and the resultant Go Through Me gets Undyne killed on the spot if you don't spare them. She gets better pretty quick, though. Much better.
  • Nice Job Breaking It, Hero!: In a No Mercy run, they follow you around while Undyne is hunting you, and at a few instances, Undyne gives up on a chance to slay you so as to remove them from the area for their own safety. If you complete a No Mercy run, then it's partially because the Monster Kid got in the way.
  • Running Gag: Literally! When they break out into a run, before leaving the frame, they'll trip and fall flat on their face before getting right back up and continuing their run.
  • Shoo the Dog: When they finally figure out you're a human, they ask you to be mean to them so they can feel okay about hating you, since your races are enemies. If you refuse, they'll reluctantly insult you instead. If you choose to insult them, they laugh, saying that their sister calls them that all the time, so they have to insult you instead anyway.
  • Verbal Tic: "Yo!"

Hey... there... noticed you were... here...

An enormous aquatic monster who is very lonely.

  • Ambiguous Gender: Their gender is never stated in the game.
  • Animesque: While some of the game artwork is this to a degree, they are the most prominent (their eyes in particular), and the inexplicable "san" at the end of their name.
  • Luminescent Blush: Sports some pink blush when they look optimistic.
  • Mood-Swinger: They change moods very quickly, with expressions ranging from wide-eyed optimism to barely-holding-in-a-panic-attack.
  • Punny Name: Not Onionsan themself, but the name of a band they wants to put together is called the Red Hot Chibi Peppers. They've only thought of the name.
  • Shrinking Violet: Gives off this vibe.
  • Stepford Smiler: Has a huge smile on their face every time you see them and greets you happily whenever you walk by, despite very clearly being distressed about the sinking water levels of Waterfall. Brief cracks in their facade suggest they're actually very depressed.

Woah there!
I've got some neat junk for sale.

An old turtle monster who sells you items in Waterfall.

  • Adventurer Archaeologist: Certainly looks the part despite his age, with his magnifying glass and pith helmet. However, the only artifacts he has on sale are actually the equipment of the purple SOUL, or at least copies of them.
  • Cool Old Guy: He's pretty friendly and playful (assuming you're not in a No Mercy run at least), if only a bit senile.
  • Deadpan Snarker: On a No Mercy run, he falls firmly into this. Quotes include 'So you came... what a treat!' and 'Don't expect a discount'.
  • "Facing the Bullets" One-Liner: Lapses into Medium Awareness below, but when you try to sell him something on the No Mercy route...
    Gerson: I wouldn't buy your chitzy garbage at knifepoint.
  • Humble Hero: In the No Mercy route, he claims he was never a hero, while simultaneously distracting you and buying time for others to escape to safe places. According to Ross and Barry, that's enough for him to count as a realistic hero.
  • Lampshade Hanging: If you try selling him anything, he'll point out how ridiculous that'd be, since he doesn't want MORE junk on his hands.
  • Meaningful Name: A somewhat convoluted one. His full name (Gerson Boom) is a reference to an infamous competitive Super Smash Bros. 64 match involving players Gerson and Superboomfan, where they spent roughly 50 minutes turtling each other, including a 23 minute timeframe where they didn't hit each other at all.
  • Medium Awareness: On the No Mercy route, he implies that he knows you can't attack shopkeepers, and is happy to charge you money and chat with you to buy more time for other monsters to evacuate.
  • Mr. Exposition: If you ask him about the Delta Rune and its significance. Notably he's the only one who refers to the symbol by name.
  • Named by the Adaptation: Deltarune gives his full name as Gerson Boom.
  • Retired Badass: Was once a hero much like Undyne is now. He was apparently called the Hammer of Justice. Though if you call Undyne outside of his shop, she mentions he's a legend for having been in the war because he survived it, not because he did anything special during it, which speaks leagues for how horrifically one-sided the war truly was.
  • Seen It All: His age helped a lot in his knowledge of history, since he's lived through most of it.
  • Signature Laugh: Wa ha ha!
  • Time Abyss: He's old enough to have been in the human/monster war.
  • Turtle Power: Definitely a turtle, for "power" see Retired Badass above.

hOI!!!!!! i'm tEMMIE!!

A type of cat/dog-like monster. They are all named Temmie (except for Bob).

  • Author Avatar: Of the game's primary artist, Temmie Chang. In the credits, while most characters are listed as being created by someone, Temmie is credited as being Temmie (the artist) as opposed to being made by her.
  • Broke the Rating Scale: After a patch in January 2016, using CHECK on Temmie will state her ATK and DEF are "Tem outta Tem."
  • Catchphrase: "hOI!! i'm temmie"
  • Cat Smile: Only natural, being cat-dog creatures of some description. Most prominent on the Temmie Shopkeeper. Also rather fittingly, the species wears The Ditz hat as a whole.
  • Cloud Cuckoolander: Easily some of the strangest monsters in the game. Their faces seem to be completely separate from their bodies, allowing them to move around the front of their head freely and even completely separate if you wait long enough when you're in battle with one of them and if you pay the Temmie Shopkeeper's college fee, she leaves her face behind while the rest of her moves offscreen.
  • Creator Cameo: Temmie is one of the artists who contributed to the game.
  • Cute Kitten: A part-cat, part-dog monster that's all adorable.
  • Cuteness Overload: They love humans. Unfortunately, humans (or at the very least, the protagonist) are allergic to Temmie. One of their attacks when you encounter them is a stretching paw that gently touches your SOUL before retreating (which is to say, attacking by petting).
  • Cuteness Proximity: For humans. They go absolutely ballistic if they find you, gushing over how cute you are.
  • Department of Redundancy Department: Her Golden Ending title is... "Temmie". Both white and yellow titles, in fact.
  • The Ditz:
    • A whole species of them. For instance, one of them is trying to hatch an egg, which upon examination turns out to be hard-boiled.
    • The Temmie Shopkeeper is also the only shopkeeper you can sell items to, on the basis of just having poor impulse control. If you keep selling her items, she randomly decides that she wants to buy that specific item at a higher price while simultaneously complaining that she should save money for college instead but she never actually runs out of money to buy your items: as a result, you can fund her college solely by buying items from her and selling them back to her, implying that she already had all the money she needed to go to college but was too stupid to realize it.
    • Encountering Temmies in battle can result in them forgetting their own attacks, or accidentally misspelling their name in the battle screen (as "Temmiy").
  • Enemy Summoner: Flexing at them during a battle will cause Aaron to appear, and Temmie to run away.
  • Expy:
    • They're quite similar to the Mr. Saturns from EarthBound with their strange speech patterns, nonsensical village and alien demeanor along with a verbal tic in their dialogue.
    • Also possibly to Nepeta of Homestuck as Aaron is to Equius, given the unique interaction they can have.
  • Genki Girl: If you encounter them in battle, they're constantly vibrating in place.
  • Hidden Depths: The Temmie Shopkeeper has the completely unexplained ability to know how many times you died, which very few characters have. See Ultimate Blacksmith below.
  • Intrigued by Humanity: Temmies LOVE humans and find them to be cute.
  • Karl Marx Hates Your Guts: Hilariously inverted. The Temmie shopkeeper seems to have no concept of the value of money — she'll pay much more for some items than other items which are much stronger, and you can sell her own items back to her (or items sold by the nearby shopkeeper Gerson) for a higher price than you paid for them.
  • Leitmotif: "Temmie Village" and "Tem Shop", which are remixes of "Dogsong".
  • Muscle Angst: Flex in front of one and she'll remark "muscles r ... NOTCUTE!"... Then Aaron will pop up and Temmie will simply run off because she can't stand him and his muscles.
  • Obfuscating Stupidity:
    • The shopkeep Temmie speaks in proper English if you agitate her by refusing to sell her an item she really wants twice in a row.
      Temmie: Is this a joke? Are you having a chuckle? Ha ha, very funny. I'm the one with a degree.
    • On a No Mercy run, the Temmie shopkeeper will try to scam you with an absurdly expensive (and useless) Temmie Flake instead of offering to pay for college so you can obtain the Temmie Armor, implying that despite being Temmie, they're at least perceptive enough to realize helping you is an awful idea.
  • O.O.C. Is Serious Business: Played for laughs with the Temmie shopkeeper if you refuse to sell them something that they're offering you extra money for.
  • Odd Name Out: They're all named Temmie. Except for Bob.
  • Painting the Medium: Their dialogue is filled with bizarre spelling, capitalization, and punctuation errors that Funetik Aksent alone can't account for.
  • Planet of Steves: All of the Temmies are named Temmie, with the exception of one named Bob.
  • Puff of Logic: The Temmie that is allergic to itself doesn't show any signs of a reaction until it tells you as much, then it immediately breaks out in 'hOIVS'.
  • Rubber Man: Their attacks consist of stretching their limbs to either 'pet' you or walk around with the chance you'll bump into their legs.
  • Self-Deprecation: For artist Temmie Chang. She was put in the game... as an entire species of complete idiots.
  • Spell My Name with an "S": The correct spelling is "Temmie", but "Temy" and "Temmiy" also pop up due to weirdness (the former being the spelling used for the Temmie Armor, the latter occasionally popping up in battle flavor text). "Tem" as shorthand seems to be consistent, at least.
  • Trademark Favorite Food: Tem Flakes. Which are made out of construction paper.
  • Trauma Button: Don't flex in front of one, especially if you have muscles, or it'll run away frightened.
  • Ultimate Blacksmith: Paying for the Temmie shopkeeper to go to college will allow her to create for you the single best armor in the game. It starts out ridiculously expensive, but the price goes down every time you die.
  • Uplifted Animal: One Temmie in the village, who goes by the name of Bob and speaks in an intelligent manner.
  • Verbal Tic: A few of the words in their dialogue are puns of the word "hoi" ("bOI!", "hOIVS!")
  • Voice Grunting: A cat-like chattering noise.
  • We Buy Anything: The shopkeeper will buy anything from you, including items that she just sold to you a few moments ago, and often at a higher price than you bought it for.

Don't look so blue, my deary~

A spider girl who's having a bake sale. If she invites you to her parlor, excuse yourself.

  • Achilles' Heel: Gameplay-wise, she can be defeated in the first turn if you eat a spider-based food item in front of her, thus proving that you care about her cause!
  • All Webbed Up: Her special soul effect, which turns your soul purple. You're confined to hopping between horizontal tracks rather than floating freely like normal.
  • Anthropomorphic Food: Has a "pet" muffin monster that attempts to eat the player's SOUL, chasing them upwards in a Rise to the Challenge scenario.
  • Arachnid Appearance and Attire: Muffet has a five-eyed, spider-like face and a total of 8 limbs. Most of her attacks involve spiders.
  • Bad Boss: Downplayed; making her spider friends into pastries is one thing, but feeding them to her pet cupcake monster while trying to attack you is another. The spiders don't mind, though.
  • Battle Boomerang: One of her projectiles acts like this, with it flying almost entirely across one of the lines before flying backwards. Going with the food theme, they're actually croissants.
  • Blue-and-Orange Morality: Even if you're in the No Mercy route and she's perfectly aware that you're a violent psychopath, she's perfectly willing to let you go when she finds out that you've never harmed any spiders. There's also the fact that she has it out for you in any route because she thinks you hate spiders, but bakes spiders into her own pastries.
  • Bribing Your Way to Victory: You can pay Muffet some of your money to have her reduce her attack power on any turn. This price goes up every time the option is taken. Alternatively, you can avoid fighting her by buying food from her, or by eating something you bought from an earlier spider bake sale.
  • Calling Your Attacks: After each turn, a small, normal spider will walk on screen holding a sign with pictures of donuts, croissants, spiders or a cupcake, indicating what type of attack Muffet will use next.
  • Carnivore Confusion: The reasons she attacks is that she was informed that you hate spiders and killed a lot of them, yet she herself cooks other spiders into her pastries and cider. It may have something to do with monsters being made of magic, but it's still very strange. Then again, real-life spiders sometimes do eat each other. It could also be that, as a predator, she views killing something for food to be perfectly acceptable, but killing something for fun to be cruel.
  • Cute Little Fangs: Muffet sports a pair that always protrude from her mouth.
  • Cute Monster Girl: You have to admit, she does look adorable in her little outfit and matching tea sets.
  • Edible Ammunition: In addition to sending spiders out, she'll toss in donuts and croissants when attacking. Considering her own Carnivore Confusion, the spiders themselves also count as this.
  • Everyone Has Standards: Implied. It seems that, while she eats spiders and doesn't mind other people doing the same, she won't tolerate cruelty towards them, like killing them for other reasons or torturing them.
  • Giggling Villain: "Ufufu~"
  • Hartman Hips: Possibly just her puffy pants but she has quite a large "tuffet" in comparison to her limbs, quite possibly hiding her actual abdomen.
  • Hold the Line: In order to Spare her, you need to last long enough for a spider to come along with a telegram for her saying that you haven't hurt any spiders. You can skip right to the note by eating something you bought from the bake sale back in the Ruins.
  • Hypocrite: She attacks you because she believes you kill spiders. You know, those same spiders she makes her pastries out of? Of course, her anger towards you seems more directed at you being cruel to spiders and torturing them rather than simply killing them to eat them like she does.
  • Intrepid Merchant: Holding a bake sale in the middle of Hotland. Pastries made by spiders, for spiders, of spiders!
  • Leitmotif: "Spider Dance", which is partially a remix of "Ghost Fight".
  • Made from Real Girl Scouts: All of the products of her spider bake sale are made with real spiders. She also intends on using the protagonist as an ingredient.
  • Meaningful Name: Her name is an obvious reference to the "Little Miss Muffet" poem, in which a spider frightens away a young child.
  • Mini-Boss: You must fight her in order to move forward, and her battle is rather unique and hard, but she has no impact on the narrative, and you can even skip the whole battle if you do the right thing.
  • Money Fetish: You can pay her money in battle to reduce her attack power, and the ways to skip fighting her both involve spending money. Also, she was hired by someone for a lot of money to take the player's SOUL. Although to be fair, she has a pretty good reason for wanting it.
  • Monstrous Cannibalism: Not only does she use other spiders as filling for her baking, she pouts that she should have webbed Alphys up and turned her into pastry filling. Considering that large spiders are known to eat smaller spiders (with females in particular often eating the exhausted males after mating), it's not too surprising, though it also makes her a hypocrite for attacking you because you supposedly harm spiders.
  • Nice Job Breaking It, Hero!: Letting her ramble on a No Mercy Run reveals Alphys personally warned her about you during the evacuation, and left an escape path leading to the capital. Upon using said path, the Hotlands would seal up behind her and trap you inside. Unfortunately for Alphys, Muffet refused to abandon her nest and completely shrugs off the evacuation, preferring to kill you herself. As a result, you simply murder her and move on through the Hotlands unimpeded.
  • Perpetual Smiler: Keeps it even when dying or having her soul sucked out.
  • Pet Monstrosity: A giant, cupcake-like spider monster that has an intense appetite? Perfect pet for someone like Muffet.
  • Pinball Projectile: If she angles her donut projectiles, they'll bounce off the walls of the dodge window.
  • Psycho for Hire: She was offered a lot of money to take the protagonist's SOUL.
  • Rise to the Challenge: Her cupcake monster acts as this; it chases your SOUL upwards across several lines for quite a while. The wall is the easy part in this case; the hard part is the mass of spiders that are being sent down to the monster while you're trying to climb upwards.
  • Say It with Hearts: Tildes, actually~
  • Signature Laugh: Ahuhuhuhu~
  • Skewed Priorities: During a No Mercy run, she knows and acknowledges that you are a bloodthirsty mass-murderer. She's still perfectly willing to spare you, though, simply because despite all the people you've killed, you still never harmed any spiders among them.
  • Skippable Boss:
    • If you buy an item from her bake sale — unlikely, since everything costs 9999 G — she won't fight you, unless you're on a No Mercy run. Alternatively, eating a Spider Donut or Spider Cider in-battle with her will cause her to spare you instantly, letting you end the battle as early as the first turn, before she has a chance to attack.
    • She'll offer to spare you immediately on a No Mercy run because sure, you've killed a lot of monsters, but you haven't hurt any spiders.
  • Spiders Are Scary: At least, when you don't buy their baked goods. Subverted for the most part, as she's pleasant otherwise.
  • Spider Swarm: Most of her attacks involve swarms of spiders or swarms of pastries.
  • Spontaneous Choreography: Two text boxes that display at the beginning of your turn note that the spiders are clapping to the music, and that Muffet eventually joins them in a synchronized dance.
  • The Tease: She'll offer some rather suggestive lines if you opt to stay in her web after she decides to spare you, and tells you that you're free to come back and let her tie you up any time.
  • To Serve Man: She initially intends on using the protagonist as ingredients in her pastries, but grumps that they don't look very tasty.
  • Vague Age: Her creator described her as "a lil' baby spider monster", but clarified that it wasn't literal. She's seen running her own business and she addresses the protagonist as "deary".
  • Well-Intentioned Extremist: She needs money for the purpose of raising funds to rescue the spiders trapped in the Ruins, as they cannot make it past Snowdin's cold weather.

    Bratty and Catty
Hey! Check it out!

Yeah! Check it out!

Two trendy monster girls who hang out in an alley and sell you stuff.

  • Affably Evil: They're just SO hyped for the destruction of humanity! They seem embarrassed about it in the epilogue, if the player confronts them about being a human.
  • Big Beautiful Woman: Catty is noticeably plus-sized, and Burgerpants refers to her as a “hot chick” at at least one point.
  • Childhood Friends: They were friends with Alphys when they were younger, though Alphys is enough older than them that they describe her as a "big sister." However, they haven't hung out with her in awhile, since Alphys is now the Royal Scientist.
  • Cute Little Fangs: Catty has them. Well, she is a cat.
  • The Dividual: As they are the only shopkeepers that work together, they are only seen together. Aside from visual difference there isn't much that distinguish them.
  • Dub Name Change: Bratty is known as Aligatty in the official Japanese localization.
  • Fangirl: Of Mettaton, to the point that Catty tries to pay you to get Mettaton to sign her butt. They also both go off on a long spiel about being married to him, where he just doesn't know it yet.
  • Fat and Skinny: Implied in their their shop sprites. Catty's the fat, while Bratty's skinny.
  • Foreshadowing: Talking to them about Mettaton will bring up some very interesting facts about him they've noticed.
    • They notice that Mettaton always acts like being built was his idea.
    • He always treats Alphys like an old friend.
  • Furry Confusion: Comes up in the epilogue. Catty expresses her desire to own a pet cat, while Bratty expresses her desire to eat one. But Bratty's just joking. Allegedly.
  • Heterosexual Life-Partners: Despite both loving Mettaton, Catty offhandedly mentions "[she] doesn't want to have a dream without [Bratty] in it".
  • Hypocritical Humor: If you try to sell them something while you have a Glamburger in your inventory, this conversation ensues.
    Catty: Oh my God. Is that a Glamburger? OH MY GOD!!! GIMME!!!
    Bratty: God, Catty. Try to have some self-control.
    Catty: Sorry...
    Bratty: 'Cause they OBVIOUSLY brought that Glamburger for ME.
    Catty: NO WAYYY!!!!!
  • Like Is, Like, a Comma: To go with their Valley Girl accents.
  • Meaningful Name:
    • Catty's a cat. Go figure.
    • Both of them have bratty Valley Girl mannerisms, and one of them is even named Bratty.
    • Their species, too. See Stealth Pun below.
  • Multicolored Hair: Catty's hair is black with dyed blue bangs.
  • Non-Mammalian Hair: Bratty, an alligator monster, has blonde hair styled in Regal Ringlets.
  • Ship Tease: With each other, but Catty also mentions that though Burgerpants is weird, she also thinks he's "kind of cute".
  • Signature Laugh: MEOW-MEOW! Incidentally, this is the cat sound from the music composition game in Mario Paint.
  • Skewed Priorities: On the No Mercy path, the two leave a lengthy note with both of their own comments to the protagonist insulting them and telling them not to take their stuff... because they didn't want their pens to go to waste. And all the while, Alphys was trying to get them to evacuate.
  • Stealth Pun: Together they are an Alley-cat and an Alley-gator. They are also V-alley girls.
  • Trademark Favorite Food: Glamburgers. If you choose the "sell" option, they ask you to get them some, and they get excited if they notice that you are carrying one.
  • Valley Girl: With a touch of Boston, to judge by their use of "wicked" to mean "very".
  • Wingding Eyes: They both end up with hearts for pupils whenever they talk about Mettaton or Glamburgers.

Don't live like me. I'm 19 years old and I've already wasted my entire life.

A long-suffering employee at the MTT-Brand Burger Emporium. Has a dour outlook on life.

  • Affectionate Nickname: If the player gets friendly with him, he'll regularly call them "Little Buddy." Inversely, if the player is doing the genocide route, he'll call them "Little Weirdo."
  • Be Careful What You Wish For: He used to actually want to work with Metatton. Now he does, and he couldn't be unhappier. He even quotes the name of the trope word for word.
  • Boss's Unfavorite Employee: Mettaton may not be the best manager, but he's generally a Benevolent Boss to his employees... aside from Burgerpants. He even made a whole album dedicated to telling Burgerpants how bad at his job he is.
  • Burger Fool: The foremost employee in MTT Burger, which plays this trope to a T, and the victim of every single stereotype related to them. In fact, it appears that he has fully resigned himself to this fate.
    Burgerpants: I'm 19 years old and I've already wasted my entire life.
  • Cartoon Creature: He looks like a mix between a cat and a bear, and due to his constantly changing sprite, sometimes he looks more like one than the other.
  • Chubby Chaser: Refers to both Catty and Bratty as "hot chicks," the former of which is visibly overweight. Proving that, at the very least, plumpness isn't a dealbreaker for him.
  • Cigarette of Anxiety: He regularly lights up a cigarette when talking to the player, no doubt to relieve the stress of his job.
  • The Cynic: Completely resigned to being stuck in his terrible job forever, thinks friendship is just a way for attractive people to enslave you, generally has nothing good to say about anything or anyone... He has a bad case of it. The only thing that keeps him going is the hope that the barrier is broken and that he can leave the fast food business behind him to pursue his acting career.
  • Embarrassing Nickname: And it's the only name he's ever called.
  • Expressive Accessory: The M on his hat changes along with his sprite. Sometimes it's an M, sometimes it's a squiggle, and sometimes it's a W.
  • Gonk: The result of being animated with a John Kricfalusi-esque attachment to emotion over sticking to the model gets him doing some hilariously ugly expressions none of the other characters even come close to making, not even Flowey. It's also because Toby didn't change his "terrible concept art."
  • Hypocritical Humor: When you tell him that Bratty and Catty want him to stop acting like it's their fault he got his nickname so they can become friends, he claims that friendship is just a way for attractive people to make you their slave. Cue Beat.
    Burgerpants: So, uh, what time would they wanna hang out?
  • I Ate WHAT?!: According to him, Glamburgers are at least partially made out of (edible) sequins and glue.
  • Non-Standard Character Design: He wouldn't look out of place in an episode of Ren & Stimpy. His face, and the rest of his body for that matter, don't stick to one shape between his different expressions.
  • Only Known by Their Nickname: He got stuck with it after an attempt at smuggling some Glamburgers for Bratty and Catty got him startled by Mettaton and his pants dropped when trying to pick up some burgers that fell out, which caused all the other burgers in his pants to spill out.
  • Playing a Tree: The credits show him as a bush in a play Mettaton is performing.
  • Slept Through the Apocalypse: He's completely unaware of the evacuation in the No Mercy run. Upon being told this, he blows it off. When told everyone is dead, he asks if that means he doesn't have to work today before being similarly unconcerned. Hilariously, this cynicism keeps him alive in the long run since there's no way to actually fight someone in the shop menu, so he can't be killed as long as he stays there.
  • Small Name, Big Ego: He fancies himself a jaded worldly person with the potential to be a great actor. Really he's just an insufferable lazy cynic that often blames others for his problems. He tends to go on trying to impart wisdom to you about how the only way to get through life is to lie to yourself, and that attractive people only ever want to take from you. You can convince Catty and Bratty to invite him on an outing to the dump, mostly out of pity.
  • Smoking Is Not Cool: A habitual smoker who's also a pretentious, lazy cynic stuck with a job he hates.
  • Suspiciously Specific Denial: In the No Mercy route, he's aware that the protagonist is killing everyone, but he continues his job as if nothing is wrong, even when questioned about everyone leaving.
  • Threat Backfire: Attempting to threaten him on the No Mercy run causes him to spout this gem:
  • Throw the Dog a Bone: He finally gets to realize his original dreams in the True Pacifist Ending, in which he's seen onstage with Mettaton, Napstablook and Shyren at a concert.

    Annoying Dog
(He doesn't know what to say.)

A recurring NPC that exists to be lazy and annoy everyone. Also, he's Toby Fox, creator of Undertale. Resembles a Samoyed, a real life dog breed.

  • Achievements in Ignorance: The Annoying Dog unwittingly programmed an indie-game just by barking into a translator.
  • Ambiguously Human: Make that ambiguously canine. He's a dog monster that can absorb items through his skin and leaves behind a "dog residue", which can be variously described as a shed husk, shiny trail, webbing, unwashed dishes, glowing crystals, or an unfinished jigsaw puzzle. Then again, he lives in a world of monsters, implying he is not an actual dog.
  • Author Avatar: Appears in the Greenlight trailer and the hidden developer room as Toby's avatar.
  • Darkhorse Victory: In the Neutral ending when all major bosses are dead, but no enemies are, the Annoying Dog is heavily implied to become king, simply because nobody is willing to challenge him for it. At least his laziness makes for a good ruler... somehow.
  • Diabolus ex Machina: Pretty much its MO. If something inconvenient, annoying, or unfortunate has to suddenly happen to the Protagonist or one of their friends to make their day worse, it's often the Annoying Dog's fault. Examples include stealing Toriel's phone so you can't call her for assistance, swiping Papyrus' bones so he can't use his Special Attack on you, and absorbing the Legendary Artifact so the Protagonist can't have it. Perhaps the biggest one, though, is him stopping Hard Mode simply to teach the player to accept that it’s over.
  • Leitmotif: "Dogsong", while more often used in the game for dogs in general or Trolling moments, is seen as the Annoying Dog's theme, and pops up almost every time it appears. The song plays when Sans is talking to the player in the Neutral run when a dog becomes king, which heavily implies it was the Annoying Dog himself.
  • Mythology Gag: Possibly unintentional, but how it managed to program a whole indie game by barking into a translator by accident may remind certain fans of how Toby himself composed Megalovania.note 
  • Recurring Extra: The Annoying Dog, Toby's Author Avatar that appears all throughout the game as a lazy, greedy and stupid dog. He even shows up at the end of Hard Mode.
  • Running Gag: Frequently shows up just to cause trouble, especially for poor Toriel and Papyrus. It steals the former's cellphone multiple times, and in the case of the latter first it eats his ultimate attack and then it eats his bone collections.
  • Self-Deprecation:
    • It's described as lazy and annoying, and generally does nothing but be a nuisance around everybody. Toby even calls himself a shitty dog when posting the news about his own game having higher ratings than Hideo Kojima's then latest game on Tumblr.
    • Within the non-failsafe Developer's Room, examining the Annoying Dog's computer reveals "most bad posts come from him". The Annoying Dog is the game's Author Avatar.
  • Sitcom Arch-Nemesis: With Papyrus - he is always stealing Papyrus' bones, while Papyrus tries to use Annoying Dog in one of his puzzles against the player.
  • Suddenly Voiced: The Annoying Dog actually talks at the end of Hard Mode to declare it over.
  • Troll: The Annoying Dog lives for it. All of its appearances involve messing with the characters or the player themselves, and "Dogsong", its theme, is associated with trolling moments such as Sans' I Surrender, Suckers in the No Mercy run. In the Developer Room, it's revealed that almost every troll-post online was made by this dog.
  • Trolling Creator: The above combined with being an Author Avatar makes him (and Toby Fox) an In-Universe example. How many game designers personally show up in the middle of the game to screw with their own characters and the player?
  • The Unfought: No matter how often you see the Annoying Dog nor how much it might annoy you, none of the times where you see it allow it to be fought. The one time you directly interact with him, the games states that his rug needs to be "patched" to fight him. When the game was patched in January 2016, dialogue was added to show that a single patch wouldn't work since the holes are growing.
  • Wink "Ding!": If you open the drawer in Undyne's house, the Annoying Dog will be revealed to be inside. It winks with a ding before closing the drawer.

    River Person
Tra la la.

A boat-master who takes you from town to town.

  • Ambiguous Gender: "I am the riverman. Or am I the riverwoman...? It doesn't really matter."
  • Catchphrase: "Tra la la..."
  • Cool Boat: It's normally a bland piece of wood, but occasionally and randomly it will turn into a dog-headed boat that moves by levitating and running over the water.
  • Dark Is Not Evil: Wears a black hooded cloak and their face (if any) is covered entirely in shadow, yet they're simply another friendly and socialable monster — one who serves as public transportation, at that.
  • Don't Fear the Reaper: They look like the Grim Reaper with the mysterious hooded cloak, but they're pretty personable and helpful, all things considered.
  • Expy: Their character seems to be a Shout-Out to Kapp'n from Animal Crossing, as a wise boat-master who imparts random tidbits of trivia in song. Also resembles Charon, the ferryman of the river Styx in Greek Mythology.
  • The Faceless: Their face is obscured by a hood.
  • The Ferryman: Fits perfectly the classical depiction of this trope, being a hooded figure who allows the player to travel from place to place using their boat.
  • Hidden Depths: They seemingly know that Flowey is neither a monster nor a human. And while it's mostly speculation at this point, one of their possible lines implies that they know about Dr. Gaster.
    "Tra la la. Beware of the man who speaks in hands."
  • In the Hood: They always wear their hood up, which contributes to how mysterious they are.
  • Nerves of Steel: They're the only character that the Fallen Child directly interacts with during a No Mercy playthrough who doesn't react to them in the slightest despite everything that's happening around them, even though they don't have the innate protection against being attacked that shopkeepers like Gerson and Burgerpants do. Maybe the protection extends to all fast travel services as well?

How well does it match the trope?

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