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Napstablook's name may be a play on "Napster bloke," in reference to the file-sharing software Napster, which was frequently used to share music files. The computer in Napstablook's house also displays "a music-sharing forum".
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Toriel was created as a parody of tutorial characters, with developer Toby Fox citing Fi from The Legend of Zelda: Skyward Sword as a notable influence. Her motherly personality was chosen both as an extension of her hand-holding and due to the general lack of genuinely motherly characters in RPGs.
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The track "The Choice" almost exactly matches the track "Undertale" when sped up by 666%.
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Temmie's weird speech patterns seem to be inspired by Mr. Saturn from the Mother series.
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The markings seen on Papyrus' chestplate are the same markings seen on the Starman's chest from EarthBound.
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A unused animation of the NPC species "Temmie" is seen walking or running. This may have gone unused due to temmie being a static character like most other NPCs.
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An unused Spell icon was seen in a screenshot of the game, probably implying that spells were going to be used in the game.
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Undertale has two secret endings that can be seen by doing a Spoiler:Pacifist Run after a Genocide Run. If the player chooses to stay with Toriel, Chara's face appears on Frisk and a lower pitched version of Flowey's laugh plays. If the player chooses to leave, the picture of Frisk and friends is replaced with a picture of Chara in Frisk's place and big Xs appear on other characters. This may be implying that Chara killed them after the game. The only way to get the true pacifist ending back is to either modify or replace the game's save files.
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