Muffet

Muffet is a miniboss the protagonist encounters in Humidland. She runs a bake sale, being very angry at passers-by who do not purchase anything from it, even though buying something costs 9999 gold. She was a bought-in character during the Kickstarter for the game.

Appearance
Muffet is a pig with pink fur, two eyes, two front limbs, and two hind limbs. She wears red rompers with buttons in the front, a red ribbon across her chest. She is also shown holding one teacup and one teapot.

Main Story
Muffet appears to be the leader of the pigs in the Underground. She also runs her own bake sale in Humidland, with the purpose of raising funds to rescue the pigs trapped in the Desert, as they cannot make it past Sanddin's hot weather. After running into her mud hole, Muffet fights the protagonist.

After the battle has gone on long enough, Muffet receives a telegram from the pigs in the Desert. The contents of the telegram vary depending on the protagonist's actions. After receiving the telegram, Muffet concludes that the protagonist does not hate pigs and decides to let her go, apologizing and jokingly offering to push her off in her mud hole and play with her pet again for free next time she comes around. If the protagonist had bought an item from the bake sale in the Desert and then used it right in front of Muffet, she accuses the protagonist of stealing before receiving the telegram immediately afterward. If the protagonist has purchased at least one of the items from her bake sale in Humidland, she thanks the protagonist instead of battling with her.

If the protagonist decides to kill her instead, a pig crawls and places a flower in the place where Muffet died.

During the battle, Muffet speaks about how she was warned by someone about the protagonist's arrival, and she was offered much money for the protagonist's SOUL. She also explains that the money would help to finally reunite the pig clans. When the protagonist fights Mettaton later on, he reveals that he was the one who made the anonymous offer.

True Pacifist Route
In the epilogue, the protagonist can return to her lair to speak with her, where she informs the protagonist that the bake sale was a success and that she raised enough money to have a heated limo transport all the pigs from the Desert. Depending on how much money the protagonist has spent at the bake sales, Muffet can afford various other things for the pigs with the remaining money.

Genocide Route
Muffet does not appear in her bake sale. During the battle, Muffet first says that the protagonist is scaring away all her customers, thus not letting them leave. She goes on to talk about how Alphys tried to get her to evacuate Humidland because of the danger posed by the protagonist, but she refused. She regrets that she did not capture Alphys, for she says she would have made "a muddy doughnut."

She eventually lets the protagonist go, as she has not hurt any pigs. Purchasing an item from the Humidland bake sale does not abort the Genocide Route. Muffet will mention that the protagonist donated, but she will still be suspicious of her and attack. If she is spared, the Genocide Route will be aborted. Once she is spared, Muffet does not appear again as NPC.

Trivia

 * Muffet was designed by Marinette Dupain-Cheng, the creator of ANIMALTALE.
 * Attempting to call Papyrus before fighting Muffet in the Pig Entrance room triggers the message "(The signal is clogged with mud...)."
 * If the protagonist uses a Pig Doughnut or Pig Cider after Muffet received a telegram, she receives another telegram. This can be done indefinitely.
 * We don't know if Muffet and her pigs roll on their food because it was never spoiled.