Scariest Undertale Monsters

The Top Ten
1 Deprived Gaster

Look at him! He looks all melted! If you hit him a few times then he will look even worse! And who could forget the faces he makes!

2 Omega Flowey

This guy looks so disgusting! He has two faces. One looks like a private part while the other is a television with a scary face on it.

Though he's my favorite character, I'm still confused as to why he's photorealistic while the rest of the game is 16-bit.

3 Chara Chara is a character in the game Undertale by Toby "Radiation" Fox who is one of the seven people to fall to the Underground prior to the fall of the player character. Their name can be changed by the player and will be assumed as the player character, until the Pacifist Route when Asriel asks for the player's name, which is Frisk. In the genocidal route (achieved by killing as many monsters as you can without sparing), they appear by the end to destroy the world, which happens regardless of the player's choice or intervention. Due to this, most people see them as a villain.

Have you ever had a nightmare of this demon trying to kill you? Well that’s what she does. Same philosophy as Flowey it’s kill or be killed. At the end of the genocide route she will tell you to erase the file. If you refuse the witch, then Chara is gonna walk slowly to you, screaming with a creepy face, trying to kill you.

4 Asriel Dreemurr Asriel Dreemurr is a character from the 2015 game Undertale. He was created by Toby Fox.

Asriel is the child of King Asgore Dreemurr and Queen Toriel, but he seemingly passed away prior to the game's events. His backstory is only focused on in the True Pacifist Route, which means the player does not kill a single character. As a young child, he was a close friend of Chara, a human child who... read more

Try looking at his final form. His wings are kind of dark looking. And look at his teeth! They look really sharp.

5 Sans Sans or Sans the Skeleton is a character in the 2015 RPG Undertale created by Toby Fox. He is a lazy, pun-loving skeleton who is a supporting protagonist in the "pacifist" and "neutral" routes of Undertale, and a heroic antagonist/final boss of the "genocide" route. He is known for his incredibly difficult boss fight, bad puns, and the phrases "geeetttt dunked on!!!" and "you're gonna have a bad time." He is also named after the font "comic sans." Known for also being Ness from the Mother series. (known as Earthbound in Western territories.)
6 Undyne Undyne is a main character in Toby Fox's 2015 RPG, Undertale. She is the heroic fishlike captain of the Royal Guard, who takes it upon herself to protect the monsters of the Underground. Her name is derived from the word "Undine", and is a pun on the word "Undying". Her most loved monsters are her mentor, King Asgore, her best friend, Papyrus, and her love interest, Alphys.

She might be really cool, but it gets scary when she shoots spears out of nowhere, she chases after you, and when she dies. Again she melts in her death scene.

7 Muffet Muffet is a character from the game Undertale. She appears in a region called Hotland, selling pastries to raise money to rent a heated limo to help the spider clan from the Ruins (who are also raising a bake sale) reunite with the one in Hotland because the spiders can't cross Snowdin.

Yes, I am a boy 20 years old and I'm still scared of them spiders to this day, and also genocide route bonetrousle creeps me out too much because its to slow for papyrus and papyrus is the easiest boss in the game

Is anyone afraid of spiders here?

8 Mad Dummy

Think about the music it makes when you make him mad! He looks so creepy in battle too! And his minions turn into scribbles and everything! I would not want to touch them!

9 Flowey Flowey is a flower in the RPG Undertale. He is the first character you meet, and also your best friend.

€�You Idiot! 😈 In this world, IT’S KILL OR BE KILLED! DIE!

10 Endogeny Endogeny is a minor character in the indie game "Undertale," developed by Toby Fox. This creature is a part of the "Amalgamates," monsters that have been experimented on and fused together. Endogeny is a disturbing blend of several dogs and is encountered in the True Lab. Despite its unsettling appearance, the character highlights themes of tragedy and compassion within the game's narrative.

Just look at this disgusting dog!

The Contenders
11 Amalgamates Amalgamates are a group of characters in the video game "Undertale." They are created through experiments combining different creatures and objects, resulting in bizarre and unsettling forms. The Amalgamates are a reflection of the game's themes of compassion and the consequences of scientific manipulation. Their presence adds a haunting atmosphere to the game's underground world.

Of course, amalgamates!

12 Jerry
13 Memoryhead
14 Reaper Bird
15 Snowdrake's Mother
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