Undertale - Monster Encounters / Characters

Undertale Main Character Index
Major (The Human Child, Flowey, Sans, Papyrus, Undyne, Mettaton, Asgore Dreemurr)
Others | Monsters | Spoilers (The Fallen Human)

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Ruins enemies

Dummy

It doesn't seem much for conversation.

HP: 15

AT: 0

DF: 0 (Check), -5 (Data)

A cotton heart and a button eye, you are the apple of my eye.

Chekhov's Gunman: They turn out to be a ghost possessing a dummy, and Mad Dummy's cousin.
No Name Given: Even Mad Dummy doesn't remember their name.
What was their name again...?
Screw This, I'm Out of Here!: They will tire of your aimless shenanigans and float away if you keep wasting your turns without talking to or attacking them. This is because they're possessed by a ghost.
Shrinking Violet: According to Mad Dummy; if you fled from the fight, Mad Dummy says they were "a shy sort" and that this "broke their little ethereal heart."
Training Dummy: Literally; they have no way of harming you. You can either attack them (they go down in one hit and give no EXP) or try to strike up a conversation with them (which pleases Toriel).
The Voiceless: They're a dummy. Even after you learn that they probably should be able to speak, you can never interact with them beyond your first battle anyway. There are talking Dummies in New Home, and their cousin is a dummy that talks.
What Happened to the Mouse?: Because they hadn't become corporeal yet, they can't be killed and will always leave their dummy regardless of what you do to them. They're only mentioned by a few characters and their current whereabouts are unknown.

Froggit

"Ribbit, ribbit."

HP: 30 (Normal), 20 (First Froggit)

AT: 4

DF: 5 (Check), 4 (Data), 1 (First Froggit data)

Life is difficult for this enemy.

Book Ends: Discounting Flowey and the Dummy, Froggit is the first actual "random"^note enemy to appear. A lone Froggit is the last monster to appear when telling you the story of Asriel and the Fallen Child, just before you meet Asgore. It is also the last monster (outside of Asriel) you see in a post-pacifist ending, where the Froggit that asks you to spare the monsters will say how proud of you it is.
Deliberately Monochrome: Curiously, it's always this, unlike virtually every other enemy outside of battle.
The Ditz: The Froggits that talk to you are not this, as they provide valuable advice to the player character. Any one that fights you, though...
Froggit doesn't seem to know why it's here.
Eyes Do Not Belong There: Pay attention to a Froggit's animations (especially when Toriel scares one off for you) and you'll notice that it has eyes on its underbelly.
The Goomba: The first "real" enemy you encounter. It's not quite as easy to deal with as Whimsum, but given that you actually need to try to spare or defeat a Froggit, it serves the role better.
Punny Name: Its name is a portmanteau of "Frog" or "Frogger" and "Hermit" or "Kermit".
Zero Effort Mook: The first Froggit you face gets scared off by Toriel after one turn.

Whimsun

https://static.tvtropes.org/pmwiki/pub/images/whismun.png

"Forgive me..."

HP: 10

AT: 5 (Check), 4 (Data)

DF: 0

This monster is too sensitive to fight...

Apologetic Attacker: The only reason it's attacking you is because it feels obligated to do so, and it will let you know this with its battle dialogue.
Driven to Suicide: Seems to be on the verge of it, given how pathetic it is. One of its encounter lines is “smells like mothballs and lavender.” These substances are both used to kill moths, which Whimsun resembles.
Harmless Villain: If you can even call it that. It makes no effort whatsoever to harm you if you stand still.
Moth Menace: Downplayed. While they appear to resemble a moth wearing a bedsheet ghost costume, they really aren't that threatening or malicious.
One-Hit-Point Wonder: While it actually has 10 HP in-game, it dies in one hit to any attack, no matter how weak.
Pest Controller: They are able to attack the player by sending an eclipse of moths at them.
Prone to Tears: So meek that attempting to console it is enough to make it flee.
Support Party Member: While Whimsun makes no attempt to attack you directly, its attacks do surround you and reduce the space you have to dodge.

Moldsmal

*Sexy wiggle*

HP: 50

AT: 6 (Check), 4 [Ruins] (Data), 7 [Waterfall] (Data)

DF: 0

Stereotypical: Curvaceously attractive, but no brains...

Artifact Mook: Appears in Waterfall as a slightly stronger enemy... which is a moot point, because by now, you can probably tell that they can be Spared without even using the ACT menu. Their main purpose is to make Moldbygg a more surprising encounter (because Moldbygg looks like a Moldsmal at first, but can't be Spared instantly).
Blob Monster: One that looks like lime jello.
Brainless Beauty: A parody of the concept, as the description demonstrates.
Palette Swap: Parodied; according to Check, the Waterfall Moldsmals are a different color, which obviously means they're stronger. Not like you can see the former trait.
Portmanteau: Their name is a combination of "Mold" (as in a jello mold) and a misspelling of "Small" (reflecting their small size).
Spread Shot: It can do an "Exploding Shot" version, where it fires several bullets that split apart into eight smaller bullets in all cardinal and diagonal directions.
Underground Monkey: Slightly stronger variations appear in Waterfall, though there's no other differences between them and the Ruins versions.
Zero Effort Mook: You're usually able to spare them from round one. If not, you may be dealing with a Moldbygg.

Loox

"Please don't pick on me..."

HP: 50

AT: 6 (Check), 5 (Data)

DF: 6 (Check), 4 (Data)

Don't pick on him. Family name: Eyewalker.

All the Other Reindeer: Implied. The shoe is on the other foot when they're in groups, however.
Cyclops: He isn't called Loox for nothing!
Hypocrite: Will pick on you if he's teamed up with at least one other monster.
Oculothorax: Has a small mouth, tiny limbs, and a huge eye for a body.
Piñata Enemy: Picking on Loox increases his EXP yield each time you do it (up to 3 times, but this used to stack infinitely). This makes them great for LV grinding if you're good at dodging.
Punny Name: Phonetically the same as "looks", and his full name is a pun on "Luke Skywalker".
Shout-Out:
- Its quotes "Please don't pick on me" and "Finally someone gets it" reference Monster Party, which has some of its enemies say the same.
- Loox's design is an intentional nod to Mike Wazowski, to the point where its internal filename is flat-out "Mike Wazowski"; the latter is also the case with the Loox NPC that appears outside Asgore's flower shop in Chapter 2 of Deltarune.

Vegetoid

"Farmed Locally, Very Locally"

HP: 72

AT: 6 (Check), 5 (Data)

DF: 6 (Check), 0 (Data)

Serving Size: 1 Monster. Not monitored by the USDA.

An Aesop: It constantly reminds you to eat your greens. The fact that its green attacks heal you takes this further.
Ambiguous Syntax: Vegetoid's here for your health.
Anthropomorphic Food: That apparently likes to offer monsters not-so-anthropomorphic food.
Creepy Good: It's a strange, frightening-looking sentient vegetable that pops up out of the ground to battle you. It also reminds you to eat your greens and will happily feed you if you ask.
Eating the Enemy:
- One of the ways to defeat Vegetoid monsters is to use the "Eat" action on them. However, this doesn't kill them, since the player character only takes one bite.
- In the demo, however, this kills the Vegetoids, especially when you cannot SPARE until its health is low enough.
Edible Ammunition: Pelts you with lethal veggies, unless you ask for a meal, in which case it pelts you with lethal veggies and a single green one that heals you, instead.
Evil Laugh: It "cackles", anyway.
Green Thumb: It is able to magically grow a large number of vegetables and then use them as projectiles.
Helpful Mook: Enforced. One of the ways to spare it is to ask for "Dinner" and "eat your greens" (literally, one of its bullets turns green and restores 1 HP when it hits you).
The Voiceless: Averted, despite insisting otherwise.
Vegetoid: Plants Can't Talk, Dummy

Migosp

"HEED THE SWARM."

HP: 40

AT: 7 (Check), 5 (Data)

DF: 5 (Check), 4 (Data)

It seems evil, but it's just with the wrong crowd...

Big Creepy-Crawlies: It's a large beetle that summons smaller bugs to attack.
Dance Battler: Subverted. While it will dance during battle, it's only after the other enemies are gone and it's just expressing itself. And since it doesn't move from its spot, the player can only take damage from the dancing Migosp by deliberately making contact with their SOUL.
Hive Mind: It calls the main character a "Filthy Single Minder." It itself, apparently, only is part of one when another enemy is on the field.
Peer Pressure Makes You Evil: It only attacks when other enemies are around. If it's the only enemy left on the field, it talks about how it can finally be itself and just starts dancing for the rest of the fight, becoming sparable.

Snowdin enemies

Snowdrake

"Ice puns are 'snow' problem!"

HP: 74

AT: 12 (Check), 6 (Data)

DF: 7 (Check), 2 (Data)

This teen comedian fights to keep a captive audience.

Accent Adaptation: Speaks with heavy Kansai-ben in the Japanese translation, due to the dialect's association with comedy acts and Kansai-speaking comedians.
Comedy as a Weapon: Snowdrake can be spared after laughing at his jokes, and monsters with him can be spared after making your own joke.
Feathered Fiend: While he isn't exactly evil, he will attack others simply to get their attention and resembles some kind of bird.
In-Series Nickname: He's called "Snowy" by the few people who talk about him. It becomes important when you encounter his mother, as her barely managing to say it confirms the two are related.
Kick the Dog: One of the ways to "spare" Snowdrake is to just heckle him repeatedly. It eventually culminates in you telling him that nobody will ever love him the way he is now, at which point he becomes despondent and runs away.
Missing Mom: Mentioned by his father. She ended up as one of the Amalgamates in the true lab.
Pungeon Master: He constantly makes ice puns. His father is a comedian in Hotlands, and is ashamed of him for it.
Punny Name: His head is designed like a snowflake, and he's a dragon-bird monster ("drake"). Sometimes he'll realize mid-fight that his own name is an ice pun as well.
Razor Wind: The crescents he lobs at you are implied to be this.
Toothy Bird: He resembles some kind of avian and has blocky teeth.
Unique Enemy: A minor example: if you kill him, all other encounters that would include him will have the functionally identical Chilldrake in them instead.
"Well Done, Son" Guy: Laughing at his jokes prompts him to proudly proclaim that "Dad was wrong!"

Chilldrake

"NEVER do your homework!!"

HP: 74

AT: 12 (Check), 6 (Data)

DF: 7 (Check), 2 (Data)

Rebels against everything!! Looking for its friend Snowy.

Cool Shades: The only physical difference between it and Snowdrake in battle, though overworld sprites show Chilldrake is green while Snowdrake is blue.
Rebellious Rebel: The only reason they rebel is because it's cool.
Remember the New Guy?: It will appear in Snowdin Woods once you pass Papyrus, even if Snowdrake is still alive.
Rule-Abiding Rebel: If you talk to it out of battle after reaching Snowdin, it reveals that it eats lunch packed by its parents, for one thing.
Satellite Character: Only encountered in battle after you off Snowdrake, and about half its dialog and flavor text references him.
The Unfought: Only encountered when you kill Snowdrake, meaning that it cannot be fought at all if you're going for a True Pacifist route.
Your Approval Fills Me with Shame: If you choose to Agree with its rebelling, it'll become uncomfortable and can be Spared, due to not feeling like a rebel anymore.

Ice Cap

"I just loooove my hat, okay?"

HP: 48

AT: 11 (Check, with hat), 1 (Check, without hat), 6 (Data, with hat), 0 (Data, without hat)

DF: 4 (Check, with hat), 0 (Check, without hat), 0 (Data, with hat), -100 (Data, without hat)

This teen wonders why it wasn't named "Ice Hat".

Attention Whore: Regularly tries to make people pay attention to its hat, and is offended if they don't.
Clothes Make the Superman: If you manage to swipe its hat, it becomes… Ice. Literally, a block of ice◊.
Exact Words: Take away the cap from Ice Cap, and it becomes just Ice.
I Just Want to Be Special: Why all Ice Caps wear their caps. At least one of them considers getting a piercing to stand out.
An Ice Person: Wears a hat made of ice, and attacks with icicles.
Inferiority Superiority Complex: If you successfully steal Ice Cap's hat, its dialogue afterwards suggests that it struggles with self-esteem issues, hence the hat and showboating. You can help reassure it by complimenting its real appearance.
Punny Name: An ice cap is a type of glacier, but here it refers to the cap of ice it wears.
Signature Headgear: Ice Cap makes the gigantic icicle it wears as a hat such a core aspect of its identity, it turns into an ice cube without it.
Snowlem: He is a little snowman that is wearing a very big hat.

Jerry

"Man, you guys SUCK at this."

HP: 80

AT: 0 (Check), 1 (Data)

DF: 30 (Check), 8 (Data)

Everyone knows Jerry. Makes attacks last 2 seconds longer.

And There Was Much Rejoicing: Non-lethal example. This is what happens when you ditch Jerry:
You and the other monsters celebrate Jerry's disappearance.
Asshole Victim: Should you choose to kill it, it pretty much had it coming given its unpleasant and annoying personality. However, killing it does switch the route from Pacifist to Neutral.
The Friend Nobody Likes: The battle text notices that the other monsters sigh exasperatedly whenever Jerry is around. You can even conspire with the other monsters (unintentionally) trying to kill you in order to ditch it. It's taken to the point where it doesn't even get a place in the end credits.
Full-Frontal Assault: As revealed by its Tarot card, Jerry is completely naked while fighting you.
Gonk: Has an intentionally gross design to match its personality.
Hated by All: The game makes it abundantly clear that nobody likes this monster in the slightest, and ditching it is actually considered a net positive for both you and the other monsters. Case in point:
Icecap and Snowdrake confront you, sighing. Jerry.
Hate Sink: Jerry is deliberately obnoxious and hard to get rid of (lethally or otherwise), so you can understand why its "allies" hate it. Sparing it, while possible, is far more difficult than plain ditching it when it's not looking. You and the other monsters celebrate escaping Jerry.
(After ditching Jerry) You and the other monsters celebrate Jerry's disappearance.
- The Fallen Child plays with this. If you're LV 8 or above (most likely by grinding this early on), Jerry is automatically spareable, and if you are on the Genocide Route, you can choose to spare him without consequences to your run, perhaps implying they would rather let him live than stay around him a second longer — or that they derive amusement from the suffering he inflicts on other monsters and wish to see it continue.
Jerkass: It acts obnoxious during battle, so you can see why the other monsters hate it.
Jerry eats powdery food and licks its hands loudly.
Jerry sneezes without covering its nose.
Jerry tells everyone that he's going to the bathroom.
Joke of the Butt: Jerry's buttocks are on full display for all to see in its Tarot card.
My Friends... and Zoidberg: It's introduced separately from other monsters, usually in a derogatory or at the very least dismissive manner ("Jerry came too").
Screw This, I'm Outta Here: The main way to SPARE it, via the "Ditch" ACT. The other monsters in the fight join you because they don't want to deal with it either. Take too long in Fighting or Sparing them, and Jerry will return to the fray.
Shaped Like Itself: Some flavor text says, "Smells like....... Jerry."
Stone Wall: Has 0 attack, but very high defense for that point in the game. This was likely done to make even Genocide players despise it. Makes the one way you can spare it much easier, though.
Support Party Member: Parodied. Jerry's only combative function is to lengthen its allies' attacks, but its personality is the exact opposite of supportive.

Gyftrot

"Hohohoh! Go ahead and laugh..."

HP: 114

AT: 16 (Check), 7 (Data)

DF: 8 (Check), 3 (Data)

A much-maligned reindeer monster.

Butt-Monkey: Teenagers have covered its antlers in junk, and it's put it in a bit of a foul mood. You can remove the junk yourself, but it'll just accumulate more later.
I Choose to Stay: It stays in the Underground during the True Ending so it can finally have some peace and quiet. If you removed all of its decorations, it'll leave eventually and become a Christmas display.
An Ice Person: Can attack with snowflakes.
Kick the Dog: You can put even more decorations on it, much to its dismay. You can only put googly eyes on it. Attempting to decorate more will have the flavor text declare "You can't improve on perfection." If you remove decorations from Gyftrot and then redecorate, it'll feel betrayed.
Monster Mouth: Its head is shaped very much like a regular deer, save that its jawline is vertical rather than horizontal.
Pet the Dog:
- The citizens of Snowdin have noticed its plight and dedicated a tradition to it where they decorate a big tree and put presents underneath it. Gyftrot doesn't appreciate the sentiment, especially since they haven't actually helped it at all.
- You can give it money once you've removed the decorations off its antlers.
Shell Game: One of its attacks is this, with gift boxes. The correct box in this case turns into a blue projectile, meaning you can just stand still and dodge it when it flies upwards with the other boxes.

Glyde

"Sorry... for NOTHING" *ollies*

HP: 220
AT: HIGH (Check), 9 (Data)
DF: HIGH (Check), -20 (Data)

Glyde is thinking of new slang for the word "cool," like "Freakadicious."

Attention Whore: Worse than Ice Cap, even. To Spare it, you have to deliberately deny it attention after giving it some.
Boss in Mook Clothing: Doesn't have a unique battle theme and doesn't take that long to defeat, but it's effectively invincible, deals a lot more damage than anything else in the area, and is difficult to find on your own.
Eyes Do Not Belong There: Its "defeated" sprite reveals that the spot on its tail is a third eye.
Lady Not-Appearing-in-This-Game: Downplayed. The release trailer showcases a battle with Glyde, but unlike every other monster shown in the trailer, it's an Optional Boss you actually have to go out of your way to find, and it's not easy to encounter even if you know how^note, on top of the fact that it can't be encountered after fighting Papyrus.
Metal Slime: Effectively. It only appears in a single room, and even then with a very low encounter rate (and only before you fight Papyrus on top of that), but is easily the most lucrative single enemy in the game to spare.
Optional Boss: Considering it's as much an Easter Egg as it is an actual enemy, defeating Glyde isn't acknowledged in any way besides the money you obtain.
Totally Radical: It weaponizes this trope, thanks to its attack explosions turning into "cool" words.
Weapons-Grade Vocabulary: Its larger projectiles explode into words like "Nicey" and "Chill".

Waterfall enemies

Woshua

"Wosh u face"
"Wosh u hand"
"Wosh u leg"

HP: 70

AT: 18 (Check), 7 (Data)

DF: 5 (Check), 1 (Data)

This humble germophobe seeks to cleanse the whole world.

Almighty Janitor: Woshua becomes a literal example when his Golden Ending is achieved^note.
Bilingual Bonus: Its name may be derived from the Chinese phrase 我刷 (wǒ shuā), meaning "I brush."
Helpful Mook: Enforced. You have to get him to Clean you (that is, send an attack with two or three bullets healing you instead) to spare him.
Literal Metaphor: Mettaton's news ticker has a line that says Woshua cleans up crime by dousing criminals in soap and water. "Crime doesn't go down but it smells amazing."
Neat Freak: Extremely obsessed with cleanliness, to the point that letting him clean you is the main way to spare him. It even turns out that he regularly visits the trash dump just to clean the trash and organize it into identical piles.
Only Friend: Implied to (rather reluctantly) be this to Aaron.
Police Are Useless: He tries to clean up crime, according to one MTT news ticker… but all he does is make the criminals smell nice.
Punny Name: More like Wash-you-a, and likely based on the name Joshua.
Terrified of Germs: The reason why he tries to clean everything, and can only be spared if he cleans the player. If you hug Moldbygg (and get covered in slime), then try to touch Woshua, he will run away terrified.
True Companions: The bird is his best friend.
Try Not to Die: He advises the player to do this if you talk to him after going through Waterfall once, since he has to clean up the dust you make when you die. (Apparently, he doesn't realize that you're human or doesn't realize that humans don't instantly collapse into dust when they die.)
You Monster!: Will potentially call your SOUL unclean if you've killed anyone.

Aaron

"CHECK all you want! ;)"

HP: 98

AT: 24 (Check), 7 (Data)

DF: 12 (Check), 2 (Data)

A large, muscular monster who is disliked by other monsters.

Amusing Injuries: Attacking him can cause his muscles to “droop comically.”
Character Development: After the event where he's scared by Napstablook's music, he will leave battles when shooed away. Before then, shooing him just causes him to say something creepy. ^note
Character Tics: He's always winking, even when he's scared.
Emoticon: He uses these while talking (in every single sentence he says, to the point where they replace periods), possibly to heighten his obnoxiousness ;)
Expy: A muscular horse-based creature that prominently sweats? Sounds a lot like Homestuck's Equius. Toby Fox is certainly aware of the connection, given a tweet he made shortly before release joking that Andrew Hussie had grounds to sue.^note
Flexing Those Non-Biceps: Although his sprite doesn't change, flavor text says, "Aaron's muscles droop comically" when he's at low health.
The Friend Nobody Likes: He's disliked by most other monsters in Waterfall. Temmies will leave if he shows up, and Shyren flat-out avoids him. Woshua barely tolerates him.
Glitch Entity: If a hacker tries to hack in one of the unfinished monster battles, any monsters who lack a "hurt" sprite upon being spared will use Aaron's as a placeholder.
Helpful Mook: Likely unintentionally. If encountered with Woshua, he'll turn the latter's bullets blue.
Ironic Hell: He considers the cavern being filled with spooky music to be this for being obnoxious. He also considers anime being real to be similar to his nightmares becoming true.
It's All About Me: Visit him after defeating/sparing Undyne but before entering New Home, and he will conclude that you're visiting Waterfall again just to see him flex.
Occult Detective: He becomes inspired into becoming a paranormal investigator if he gets spooked by Napstablook's songs.
Our Mermaids Are Different: Specifically, he's a merhorse (or a seahorse).
Testosterone Poisoning: He's very muscular and loves to show himself off. You can spare him by flexing, which he then turns into a flex-off... and flexes himself right off the screen.
Tuckerization: According to the art book, Aaron is named after Toby Fox's former roommate, who joked that he should appear in the game as a "very muscular and strong" enemy.

Shyren

"se re, se re se mi se mi"

HP: 66

AT: 19 (Check), 7 (Data)

DF: 0 (Check), 2 (Data)

Tone-deaf. She's too ashamed to sing her deadly song.

Actually Four Mooks: The monster you meet in combat is actually two entities. Shyren herself is only the 'head' of the monster and her 'body' is an un-named monster (in the files it's named "shyren_agent", suggesting that it's her talent agent). This is supported in the official Mettaton Live poster.
Flying Seafood Special: She 'swims' effortlessly in the air.
Friendship Song: If you continuously hum to her, you become very famous and good friends.
Increasingly Lethal Enemy: By humming to Shyren, you help her overcome her shyness and she'll become confident enough to sing. But this happens in a fight, and the more she sings, the more you have to dodge.
Portmanteau: Her name is a portmanteau of "shy" and "siren".
Shrinking Violet: She's exceedingly shy. The player can help her get over her insecurities by continuously humming to her.
Unique Enemy: There's only one encounter with her, but unlike a miniboss, she's no more difficult than your average random encounter. Despite this, three of them appear in New Home, all with agents, even!

Moldbygg

*Chaste wiggle*

HP: 70

AT: 18 (Check), 7 (Data)

DF: 18 (Check), 4 (Data)

A Moldsmal with some odd lifestyle choices.

Blob Monster: Since it's another version of Moldsmal.
Hates Being Touched: You spare it through the 'Unhug' command.
Mind Screw: Wait, how exactly do you "unhug" something?!? You either hug it or you don't.
My Species Doth Protest Too Much: It's a Moldsmal that has strict personal boundaries, instead of sexily wiggling all the time.
Portmanteau: Like Moldsmal, its name is a portmanteau of "mold" and a misspelling of an adjective that describes size.
Spot the Thread: Moldbygg doesn't move while disguised as Moldsmal; a real Moldsmal jiggles. Additionally, Moldsmal can be spared immediately while Moldbygg can't.
Spread Shot: A bizarre inversion; it can do a reversed version of Moldsmal's exploding bullet, with eight bullets combining into one and flying upwards.
Underground Monkey: A more powerful Moldsmal. In fact, it appears to be a Moldsmal at first before erupting from the ground.

Hotland enemies

Vulkin

"Ah! I'll help! Healing magmas!"

HP: 20

AT: 25 (Check), 8 (Data)

DF: 0 (Check), -10 (Data)

Mistakenly believes its lava can heal people.

Betty and Veronica: As a joke, when fighting a Tsunderplane and a Vulkin, they will be introduced like this.
Healing Shiv: Hilariously subverted; its magma cannot heal people.
Helpful Mook: An inversion of the "accidentally-assisting" type. It wants to help you, but isn't particularly effective at it...
Magma Man: It believes that its lava can heal people (it can't).
Mundane Utility: It can be seen next to Sans's hot dog stand using its magma to heat up a hot dog.
"Toasty bun!"
Punny Name: "Vulcan" (god of the forge) or "Volcano" with "kin".
Obliviously Evil: As noted, it doesn’t seem to recognize that it’s not healing people. Downplayed in that it’s not evil.
Shock and Awe: It has an attack where it summons a smiling cloud to rain down lightning bolts on you. This is because of a possible Genius Bonus: Any particlate cloud of sufficient size can create lightning, due to charge built up in the cloud. This includes ash clouds from volcanoes, which tend to be called 'dirty lightning'.
Unwanted Assistance: In-Universe. It's a kind monster and wants to help you, but it doesn't realize that its attacks hurt you.
Video Game Caring Potential: Two of the three ways to spare it are to encourage it (making its attacks harder to dodge) or hug it (reducing your defense). Alternatively...
Video Game Cruelty Potential: You can tell it that its attacks aren't helpful at all, lessening its attack, but leaving the poor thing heartbroken, and if you do it again, it runs away crying.

Tsunderplane

"It's not like I LIKE you."

HP: 80

AT: 25 (Check), 8 (Data)

DF: 26 (Check), 6 (Data)

Seems mean, but does it secretly like you?

Anguished Declaration of Love: It can be coaxed into blurting out its feelings in the midst of battle.
Clingy Jealous Girl: If paired up with a Vulkin during battle:
Tsunderplane attacks! Not because it's jealous Vulkin is paying attention to you!
Death from Above: One of its attacks is to send planes that drop firebombs at you.
Defeat Equals Explosion: It's unique among monsters in that it will explode instead of fading away.
Incredible Shrinking Man: When spared, Tsunderplane will become tiny in the upper right corner of the screen. Vulkin insists it does this all the time.
In Love with Love: Tsunderplane claims to have this in the epilogue to excuse its earlier attempts to get closer to you.
Killed Mid-Sentence: If the player kills Tsunderplane, it will let out an anguished cry before it explodes.
"B-but I never got to...!" (kaboom!)
Late for School: In a parody of a common anime romance trope, the epilogue mentions at some point it was late flying to school and bumped into someone while having toast in its mouth.
Made of Explodium: One of the few monsters that doesn't turn to dust upon death on-screen. It instead spirals out of control, crashes, and explodes.
Master of the Mixed Message: A news ticker in a Mettaton section says that it gave a cashier hours of confusion by telling him it "didn't want to buy these products or anything."
Punny Name: Tsund-Airplane. Its name is also a near-homophone of Cinder-Plane.
Sentient Vehicle: A sentient Tsundere airplane.
Sizeshifter: Able to appear as large as a real-life Airbus plane when it wants to. On the flipside, see Incredible Shrinking Man above:
Tsundere: The Tsunderplane is a tsundere airplane that apparently has a crush on you. If you find it later after the barrier's been destroyed, it admits in a lengthy, probably rehearsed speech that it was only in love with the concept of romance, although the yellow credits suggest that it's still in denial.
Weaponized Exhaust: It can push its exhaust clouds horizontally.

Pyrope

"Hot enough for ya!?"

HP: 110

AT: 29 (Check), 8 (Data)

DF: 14 (Check), 1 (Data)

This mischievous monster is never warm enough.

Cartoon Bomb: Drops them in one of its attacks. They even explode into a cartoon "BOOM".
The Dividual: If two appear at once, they are called "The rare and threatening Double Davis."
Elemental Personalities: Pyrope is an anthropomorphic flaming coil of rope and specializes in fire magic, and is brash and mischievous in personality.
Fire of Comfort: You can turn up the temperature to make Pyrope happy at the cost of making its attacks more powerful. Oddly enough, this applies to the player as well, since his fire is completely harmless as long as the player's soul keeps moving.
Having a Blast: As well as using them in one of its attacks, one of the items in Mettaton's news ticker says it would've loved the bomb scenario that the player is in.
Interface Screw: Should you turn the heat up, the screen wiggles in a heat haze. This gets worse the more you turn the heat up.
Meaningful Name: Pyro + Rope = Pyrope. Not to be confused with Terezi Pyrope, or the gemstone pyrope (the name was most likely taken from the former, due to Toby Fox's work on Homestuck).
Perpetual Smiler: That large grin NEVER leaves its face at any point.
Playing with Fire: Pretty obvious just by looking at them. But instead of spewing flames, they will strike you with a burning rope.
Pyromaniac: They like heat a little too much. And despite being literally on fire, it never feels hot enough.
Stealth Pun: Rope burns occur when a rope runs across your skin quickly, causing great friction, and thus have nothing to do with fire. Pyrope, however, is literally a burning rope. It can be subverted, though, since some of the flavor text makes the pun more explicit ("Smells like rope burn").
Violation of Common Sense: The only way to avoid his attacks is to aim your soul through the fire instead of avoiding it.

CORE enemies

Madjick

"Please and thank you."

HP: 190

AT: 29 (Check), 8 (Data)

DF: 24 (Check), -1 (Data)

A mercenary monster that uses magic.

Armless Biped: What looks like two floating hands are actually two magic orbs.
Blindfolded Vision: Madjick seems to be doing this with its hat.
Death Glare: You can glare at the orbs to weaken them. Staring at them twice incapacitates it.
Dressing as the Enemy: Wielding the Stick against it will trick it into thinking that you're a wizard just like it.
Energy Ball: Two of these float around it during the fight. You have to stare them into submission to spare it. One of its attacks also involves three orbs chasing you, which can phase through the box and teleport to the other side.
Eye-Obscuring Hat: Its eyes are covered by its wizard hat.
Hired Guns: Just like Knight Knight, Astigmatism, Final Froggit, and Whimsalot.
Interface Screw: It can reverse your controls, which can be stopped by clearing your mind.
Magical Incantation: Spouts these during its fight. It includes the classic 'Hocus Pocus' alongside 'Please and thank you'.
Mundane Utility: In the True Ending, it can use its magic to become a better bowler.
Perpetual Smiler
Punny Name: Mad Jick = Magic.
Shout-Out: One of its magic words goes, "Tinkle Tinkle Hoy!", a reference to Oyasumi Punpun, in which "tinkle tinkle hoy" are the magic words used to summon a god.
Sword and Sorcerer: Often appears alongside Knight Knight.
Troll: It can be satisfied into being spared by letting it interrupt you when you try to talk to it.

Knight Knight

"Adieu."

HP: 230

AT: 36 (Check), 8 (Data)

DF: 36 (Check), 2 (Data)

This megaton mercenary wields the Good Morningstar.

Boss in Mook Clothing: While not as proportionately powerful to the player upon encounter as Glyde, she does have the most health of any non-boss monster in the game, and she takes several turns to spare (only two if the player previously hummed to Shyren five times). Her attacks are also very elaborate for a non-boss enemy.
Cyclops: Appears to have one giant, single eye.
Eyes Do Not Belong There: She has an extra set of eyes and a beak on her abdomen.
Hired Guns: Just like Madjick, Astigmatism, Final Froggit, and Whimsalot.
Magic Knight: She uses a mace as well as sun and moon spells.
Music Soothes the Savage Beast: She can be pacified by singing her to sleep, allowing you to then spare her.
Painting the Medium: She is unique among monsters in that she does not have text boxes and instead has large, free-floating white text.
Pre-Mortem One-Liner: Most of her lines are permutations of "Goodnight/goodbye".
Punny Name: You have the option to sing Knight Knight to sleep. Nighty-night! Also, her weapon is the Good Morningstar.
The Quiet One: She only speaks in single short sentences. Even when appearing in New Home to tell the monsters' story, Madjick is the one to tell most of their segment.
Samus Is a Girl: You wouldn't be able to determine her gender if it weren't for the flavor text describing her swinging her weapon around.
Shout-Out: Her body shape, with a relatively small head and a very large face on her chest, as well as arguably the usage of celestial bodies as weapons, is heavily reminiscent of Tengen Toppa Gurren Lagann.
Solar and Lunar: She has an attack where she summons a Sun which fires bullets, or a Moon which causes a hail of bullets.
Sword and Sorcerer: Often appears alongside Madjick.

Final Froggit

"Robbit, robbit."

HP: 100 (CORE), 32 (Ruins)

AT: 30 (Check), 8 [CORE] (Data), 7 [Ruins] (Data)

DF: 24 (Check), 0 [CORE] (Data), 2 [Ruins] (Data)

Its future looks brighter and brighter.

Combat Compliment: It will be impressed if you stand up to Astigmatism.
Eyes Do Not Belong There: Overlaps with Wingding Eyes; Much like its lesser cousin, Final Froggit has eyes on its underbelly.
Hard Mode Perks: Will appear in the Ruins on Hard mode.
Hired Guns: Mettaton hires some to attack you in the CORE.
Ironic Echo: Most of its lines are dramatic inversions of lines that concerned Froggit.
"Final Froggit knows exactly why it's here."
Seen It All: It has this attitude when you fight it. You spare it by mystifying it and show that there's much left in this world to see.
Shell-Shocked Veteran: If its flavor text of the battlefield being filled with the smell of mustard seed is any indication.
Underground Monkey: A more powerful version of Froggit.
Wall Jump: Its frog "bullet" that it attacks you with can jump again after hitting a wall.

Whimsalot

"Not this time."

HP: 95 (CORE), 20 (Ruins)

AT: 34 (Check), 8 [CORE] (Data), 7 [Ruins] (Data)

DF: 12 (Check), -3 [CORE] (Data), 0 [Ruins] (Data)

A guilty mercenary monster.

Despair Event Horizon: It lost its conscience because it views life as having no hope.
Driven to Suicide: Its check text reads “smells like nightshade and bleach”, both of which are used in suicide attempts.
- Notably, its lines tend to have a resigned feeling to them. "I've made my choice. I've made my peace." And you spare it praying for safety — but for whom? You, or Whimsalot itself? Perhaps its spare is a compression of talking it out of suicide?
Face Framed in Shadow: Removing its mask reveals its face to be mostly hidden.
Glass Cannon: Has a high amount of attack, but the lowest defense of any Core monster. Before the January 2016 update, it was a negative value.
Hard Mode Perks: Will appear in the Ruins on Hard mode.
Hired Guns: Mettaton hires some to attack you in the CORE.
My God, What Have I Done?: You can spare it if you manage to make it "remember its conscience".
Underground Monkey: A more powerful version of Whimsun. Notably, it actually has the emotional fortitude to attack properly.

Astigmatism

"Pick on me."

HP: 100 (CORE), 50 (Ruins)

AT: 32 (Check), 8 [CORE] (Data), 7 [Ruins] (Data)

DF: 26 (Check), -2 [CORE] (Data), 2 [Ruins] (Data)

This manipulative bully ALWAYS gets what it wants.

Hard Mode Perks: Appears in the Ruins on Hard mode.
Hired Guns: Mettaton hires some to attack you in the CORE.
Manipulative Bastard: To spare them, you have to do whatever they say. In the credits, this enemy becomes a "domineering glasses salesman".
Oculothorax: A walking eye-monster, just like Loox, although occasionally it will close its eye, form teeth on it to make it look like a grinning mouth, and gain another set of eyes on the vertical lines above its main eye.
Underground Monkey: A more powerful version of Loox.

Hard mode enemies

Parsnik

"Hisssss"
Hersssss

HP: 72

AT: 30 (Check), 7 (Data)

DF: 28 (Check), -2 (Data)

This cobrafied carrot has a headful of tasty snakes.

Anthropomorphic Food: It's still a vegetable, albeit only in the loosest sense.
Eating the Enemy: Bizarrely, this is still an option. (The protagonist will slurp the snakes up like spaghetti.)
Edible Ammunition: Similar to asking Vegetoid for "Dinner", you can ask it for "Snacks"... which it will mishear as "Snakes." You can still eat the green one, though.
Hard Mode Perks: Only appears on Hard mode.
Helpful Mook: Enforced. Asking it for "Snacks" works exactly the same as asking Vegetoid for "Dinner".
Medusa: Has snakes for "hair" instead of leaves, anyway.
Nightmare Face: Its visage is intimidating, to say the least.
Punny Name: "Parsnip" with the suggestion of the word "snake".
Sssssnaketalk: A few of its lines are this, as seen in the quote above.
Underground Monkey: A more powerful version of Vegetoid.

Moldessa

(slime sounds)

HP: 52

AT: 27 (Check), 7 (Data)

DF: 23 (Check), -4 (Data)

Can't decide on a face. Can't see friend from foe.

Blob Monster: Notably more humanoid than the other blob-shaped monsters.
Hard Mode Perks: Only appears on Hard mode.
Helpful Mook: If Moldessa appears with other monsters, the "Lie Down" ACT will make them all spareable.
Underground Monkey: Another variant on Moldsmal.
Wingding Eyes: Takes this trope to the logical extreme with an entire Wingding Face. Since its facial features are constantly shifting around, you have to help it settle on a face to spare it.

Migospel

"Honk. HOOONK!"

HP: 45

AT: 28 (Check), 7 (Data)

DF: 17 (Check), 3 (Data)

This messed-up clownbug thinks battle's a performance.

Big Creepy-Crawlies: Like Migosp, it's a large insect that can summon bugs in its attacks.
Hard Mode Perks: Only appears on Hard mode.
Monster Clown: Literally a monster who also happens to be a clown. It drops the goofy facade if it's the only monster remaining in battle.
Sad Clown: It pretends to be happy in the presence of other monsters, but as soon as they leave, it shows its sadness. Apparently, it laughs to hide its pain.
Underground Monkey: A more powerful version of Migosp.

Characters / Undertale - Monster Encounters

Ruins enemies

Dummy

Froggit

Whimsun

Moldsmal

Loox

Vegetoid

Migosp

Snowdin enemies

Snowdrake

Chilldrake

Ice Cap

Jerry

Gyftrot

Glyde

Waterfall enemies

Woshua

Aaron

Shyren

Moldbygg

Hotland enemies

Vulkin

Tsunderplane

Pyrope

CORE enemies

Madjick

Knight Knight

Final Froggit

Whimsalot

Astigmatism

Hard mode enemies

Parsnik

Moldessa

Migospel

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Index

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Characters / Undertale - Monster Encounters

Edit Locked

Ruins enemies

Dummy

Froggit

Whimsun

Moldsmal

Loox

Vegetoid

Migosp

Snowdin enemies

Snowdrake

Chilldrake

Ice Cap

Jerry

Gyftrot

Glyde

Waterfall enemies

Woshua

Aaron

Shyren

Moldbygg

Hotland enemies

Vulkin

Tsunderplane

Pyrope

CORE enemies

Madjick

Knight Knight

Final Froggit

Whimsalot

Astigmatism

Hard mode enemies

Parsnik

Moldessa

Migospel

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