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Character Info

Also Known As:


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 first introduced in her armor varying in shades of gray, but

without armor, is a piscine, anthropomorphic monster. She has blue scales

and a long red ponytail. She has red and blue fins on the sides of her head, and

a pair sharp yellow protruding teeth. She wears red eye shadow and has an eyepatch

She also wears a black tanktop and jeans. Undyne has no nose.


Undyne is passionate about everything that she does. She acts quickly on her

ideas and 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.

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.