Muffet

What brings you to my parlour deary? perhaps you’d like to buy one of my delicious spider donuts? ahuhuhu! … What kind of monster were you again?

Muffet appears to be the leader of the spiders in the Underground. She also runs her own bake sale in Hotland, with the purpose of raising funds to rescue the spiders trapped in the Ruins, as they cannot make it past Snowdin's cold weather. After running into her web, Muffet fights the protagonist.

After the battle has gone on long enough, Muffet receives a telegram from the spiders in the Ruins. The contents of the telegram vary depending on the protagonist's actions. After receiving the telegram, Muffet concludes that the protagonist does not hate spiders and decides to let them go, apologizing and jokingly offering to wrap them up in her web and play with her pet again for free next time they come around.