735q4e87 Wiki
* To know more, see Undertale Wiki's page:



– Undyne before battling Frisk

Undyne (known as StrongFish91 on the UnderNet), is a fish-like monster that leads the Royal Guard. Clad in her full suit of armor, she pursues the protagonist through the entirety of Waterfall and is frequently evaded or inadvertently thwarted by Monster Kid.



Undyne is a fish monster that has blue scales and a long red ponytail. She has red and blue fins on the sides of her head, and a pair of sharp, yellow, protruding teeth. She wears red eye shadow and has an eyepatch on her left eye. She also wears a black tank top and jeans, but debuts in armor varying in light and dark shades of gray. Her eyes have black vertical pupils and a yellow sclera. Undyne has no nose.

Alphys Date

During the date with Alphys, Undyne wears a white turtleneck under a black leather jacket, a scarf around her neck, pants, lipstick, a light-colored eye patch, and lets some of her hair down.


Whenever she persists through Determination after her HP reduces to zero, her pupils turn white, and her sclera turns black. She no longer has an eyepatch, and her newly revealed empty eye socket emits a flashing light in the shape of a spear. Her hair spikes at the ends like a trident and her fin rays become more rigid and pointy. She also appears to have donned a new set of darker colored armor with souls/hearts on her chest plate and new white gloves, which have spikes protruding from their backside, accompanied by boots with pointed toes.


Undyne is passionate about everything that she does. She acts quickly on her ideas and is steadfast in her beliefs. Though she wants to defeat the protagonist, she also tries to be fair and offers an explanation of how Green Mode works. Asgore taught her the value of pacifism, which is why Undyne sees the protagonist as "a wimpy loser with a big heart." When the protagonist first encounters her, she fights to further Asgore's plan of collecting seven human SOULs but, if the protagonist shows mercy, Undyne just as quickly defends them from Asgore.

She loves to help others and mentors Shyren and Papyrus in various skills. Undyne dislikes puzzles, loves japes, and enjoys anime, an affinity she shares with her romantic interest, Alphys. Since Alphys told Undyne that anime is actually human history, Undyne regards human history as exciting and cool.

Out of all encountered monsters, Undyne possesses the most Determination. In Genocide Route, she melts before her death, implying that her body cannot handle the amount of Determination she has.

Abilities and powers

  • Spear Telekinesis- During her first battle with Frisk, Undyne can summon light blue energy spears to telekinetically launch them or have them emerge from the ground.
  • Arsenal- Undyne can create an unlimited amount of spears.
  • Enhanced Strength- Undyne is capable of withstanding hits, albeit for a long time, as shown in the Genocide Route. She's also capable of lifting up Alphys and throwing her in a garbage can in the True Pacifist Route.
  • Determination- Undyne has the most (if natural) Determination out of all the monsters in the Underground. However, this in turn causes her to melt, implying that Undyne's body cannot handle the amount of Determination she has.
  • Undine Physiology- Undyne is an undine, an elemental being associated with water.
  • Soul Manipulation- As a monster, Undyne can manipulate the soul of another.
  • Binding- Undyne can bind others' in their tracks, preventing them from moving or escaping, by turning their soul green.


Enter this link for story

AU's Undyne is in

  • UnderFell
  • UnderSwap
  • OuterTale
  • DeltaRune
  • Undersource
  • Alphyne (Undyne/Alphys Amalgamate)
  • UnderTale Rho
  • ErrorTale
  • SolarTale
  • InkTale
  • DanceTale
  • HorrorTale
  • UnderTomb
  • AxeTale
  • FreakTale
  • UnderWorld
  • UnderFresh
  • Pokemon Trainer! Undyne
  • UnderMon
  • PokeTale
  • ReaperTale
  • OceanTale
  • UnderSail
  • ChessTale
  • LittleTale
  • StorySpin
  • StorySwap
  • SpongeTale
  • StoryShift
  • GlitchTale
  • UnderWar
  • WarTale
  • GoreTale
  • SamaraiTale
  • KatanaTale
  • NegaTale
  • RoseTale
  • UnderSteam
  • Spinned Fate
  • EverTale
  • Twisted Rotation
  • TaleTwist
  • Brotherhood
  • Doused Flames
  • DeltaTale
  • TuberTale
  • OverTime
  • SherlockTale
  • Stomping Ground
  • Reclaimed Realms
  • The Crystal Caverns
  • Tantamount
  • History Recast
  • Anecdote
  • UnderSwap: Super Sigma
  • UnderSwap MH
  • SwitchTale: Flower Masquerade
  • TS!Underswap
  • Shifted Fate
  • UnderTale Corrupted Justice
  • UnderCross
  • ShiftedTale
  • Pairswitch
  • UnderTale: Reshuffled
  • Terraformed
  • ChronicleTwist
  • TurnedTables
  • TwistPlot
  • NologicTale
  • UnderToad
  • SteamTale
  • RolereVerse
  • StoryShift
  • HELP_Tale
  • UnderSkew
  • The Simpsons: Holidays of Future Passed
  • Inverted Fate
  • UnderPants
  • MafiaTale (aka.UnderMafia)
  • SwapFell
  • CandyTale
  • Trickster! Undyne
  • DemiTale
  • CT! Undyne
  • QuantumTale
  • Scramble Saga
  • WarriorTale
  • GenderBend! Undyne
  • FutureTale
  • SwitchTale
  • Shadow! Undyne
  • DarkTale
  • AlterTale
  • Under.exe
  • UnderTunes
  • Human! Undyne
  • OblivioTale
  • ShardianTale
  • MelodyTale
  • Twisted Story
  • UnderScramble
  • UnderVirus (aka. Vundyne)
  • CounterTale
  • Undyne's Tale
  • SwampTale
  • SegaTale
  • HavenTale
  • CPUtale
  • AnotherTime
  • AtlantisTale
  • GenoHope
  • BadTimeTale
  • DemonTale
  • AngelTale
  • UnderKissy
  • UnderTerror
  • GZtale
  • PhobiaTale
  • AsylumTale
  • PredatorTale
  • MettaTale
  • WonderTale (aka. UnderLand)
  • Echoed Dreams! Undyne
  • OtherTale
  • RoleSwap
  • RoleShift
  • UnstableTale
  • MetroidTale
  • UnderKeep
  • Seraphim!Undyne (aka. Omega! Undyne)
  • AlienTale
  • FusionTale (aka. Uranus)
  • Ghost+Undyne
  • QuarterSpin
  • UndyneTale
  • Don't NameTale



Undyne has a crush on Alphys which flourishes into a full relationship on a pacifist run.


The king of monsters is Undyne's friend, boss and trainer.


She is Papyrus' friend and trainer. She also teaches cooking, despite sucking at it herself.


Undyne is Sans's boss, she never refers to him by name.


He is Undyne's neighbor. They don't know each other well.


She had taught Shyren piano lessons prior to Shyren's sister falling down.

Monster Kid

MK idolises Undyne.

The Royal Guard

Undyne is the captain of the guard. She cares about the members and is assumed to know (most of) them fairly well.