| Undyne | |
|---|---|
| Undertale character | |
 3D render of Undyne created for Fangamer | |
| First game | Undertale (2015) |
| Created by | Toby Fox |
| Designed by | Toby Fox Temmie Chang |
Undyne is a character in the 2015 video game Undertale and the 2018 video game Deltarune. She is a monster who serves as the captain of the Royal Guard of the Underground under its king, Asgore. She is initially an antagonist to the player-character, the human, but depending on the human's actions, she may become their ally. She is reluctant to befriend the human, but through persistence by the player, eventually realizes that they were a good person. If the human makes a point of killing every monster possible, Undyne will transform into Undyne the Undying, vowing to destroy the human in order to save humans, monsters, and all other life from their actions. She is a lesbian, revealed to be in love with Alphys.
Undyne was created by Toby Fox, who created most of the rest of the game. He received assistance from other artists, including Temmie Chang. Undyne went through multiple depictions in early concept designs, including being more fish-like in art by Fox and resembling an Axem Ranger from Super Mario RPG in art by Temmie. She was difficult for Fox to design at first before Fox settled on her final design and characterization. Undyne later appeared in Deltarune, though in an unrelated role to the one she has in Undertale, as she was now depicted as the chief of police of Deltarune's hometown in the light world.
Since her appearance in Undertale, she has been met with positive reception. Undyne's sexuality, as well as her relationship with Alphys, were praised by critics for how they were depicted. She was considered one of the best characters in and out of Undertale, particularly as a female character. Her boss fights were also praised, with Game Informer calling the "genocide" route boss fight against her one of his favorites. Her music was also discussed, with critics and writers discussing how her music reflects her personality and actions. She has been the recipient of multiple pieces of merchandise, including a Nendoroid figure from Good Smile and multiple pieces from Fangamer.