Fell sans

Fell, Fell Sans

male

skeleton, monster

Sentinel and Manhunter

Gaster blasters
Bones
Telekinesis
Teleportation

No information

Attempted murder of a child

no information

Fell Sans looks very similar to his brother from UnderTale. This is a sharp-toothed skeleton whose upper left canine is gold (canine definition: a pointed tooth between the incisors and premolars). He is slightly taller than the UT Suns. Fell Sans wears black sweatpants, just like UT Sans. However, they do have a vertical yellow stripe on each leg. He wears red and white sneakers with yellow socks. He has bags under his eyes (due to lack of sleep). His left eye glows red 24 hours a day. He wears a red sweater, in contrast to UT Suns' white jersey. He is wearing a heavy black coat with a gold zipper. On his hood he has white, brown, yellow, pink (a combination of red and white) fluff. Fell Sans often sweats due to the heat from his large coat (black clothing can attract heat). He sometimes has a crack in his skull (most likely caused by his brother, Papyrus). He wears black fingerless gloves or red mittens or no handwear at all.

Unlike the classic Sans, who is kind and calm, Underfell Sans is a completely different matter. He is rude, angry and has a strange relationship with his brother. Papyrus often insults him to the point where he publicly calls him boss. Due to his aggressive nature, Sans also shows hatred towards humanity after they sealed the monsters underground.

Even though Papyrus often bullies him, the brothers still care for each other, although they don't show it. Sans has his limits of cruelty, as he can snap at Papyrus if he goes too far, sometimes to Papyrus's surprise (things can get so bad that the brothers can start a fight with each other, even if not to the death).

He is still quite humorous, although he doesn't like puns, preferring knock-knock jokes. Sans sometimes calls Papyrus "bro" instead of boss in public to annoy him. However, he does this infrequently as it is the smart thing to do.

Instead of Flowey claiming that the rule in the Underdark is "Kill or be killed", Sans is the one who enforces it. If Frisk goes down the pacifist path, he will be confused and disappointed by their kindness. Once they are in the corridor, Sans will fight them until they manage to rehabilitate him. After this, Sans declares that he will not harm Frisk again and leaves.

Sans is slightly more powerful than his UnderTale counterpart. He can manipulate bones and telekinetically transport living souls. He can also manipulate Gaster Blasters. He can teleport, just like Sans from UnderTale. Bones and the Gaster Blasters it summons are red.

Frisk
The Path of the Pacifist
Sans has a personal hatred for Frisk and wants nothing more than to kill Frisk. After their meeting in the courtroom, Frisk managed to “re-educate” Sans. After this, Sans declared that he would no longer harm Frisk.

Path of genocide
At first, Sans believes that Frisk is weak and will eventually be killed. After losing his brother, Sans becomes broken. He doesn't feel hatred because in this world, monsters follow the motto "kill or be killed." Sans goes to the courtroom and waits for Frisk. Instead of fighting or threatening Frisk, he thanks Frisk for believing in the motto. Sans doesn't want to fight Frisk because Frisk has become very strong. Sans tries to calm Frisk down, but to no avail. When it becomes clear that Frisk will not back down, Sans begins to fight with all his might, but Sans ends up dying after 24 rounds. During the fight, Sans loses his fear of Frisk and comes to terms with his inevitable death.

Papyrus
Their relationship is very tense. Papyrus is Sans' brother. Their relationship is based almost exclusively on conflict and pain, to the point that Papyrus forces Sens to call him "boss" rather than "bro", which he hates. They rarely speak to each other as equals, and Papyrus always speaks before him. It is said that Papyrus is only so strict with him to keep both of them safe. Papyrus enjoys intimidating and even abusing Sans (physically, mentally, and emotionally). Sans begins to worry around Papyrus. Sans wants his brother to at least take care of him, although some speculate that Sans abused Papyrus as a child.

Flowey
Sans hates Flowey because of his weakness.