🖤ℕ𝕚𝕘𝕙𝕥𝕂𝕚𝕝𝕝𝕖𝕣🔪

Nickname: Killer
Connections:
Nightmare!Sans (Master)
Universe: Alternate Timeline of Undertale
(Presumably "Something New")
Biography:
He was once the classic Sans in an endless cycle of genocide, but at some point he remembered the resets and routes his Frisk had taken. Desperate to end the cycle, he met his Chara, who made a deal with him: kill all creatures in the Underground. This gradually made him increasingly bloodthirsty, to the point where he took Chara's soul, making him stronger and more determined than Frisk. Without the ability to save and load the game, Frisk was killed permanently. After Sans's timeline was completely destroyed by him, he went on a killing spree with other timelines before meeting Nightmare!Sans and joining his quest.

Killer!Sans looks significantly different from Classic!Sans. His jacket is slightly grayer than Classic!Sans's. Instead of white cotton, the hood is light yellow. He wears a black, high-collared shirt, and on the front of the shirt is a glowing red target in the shape of a soul. The color of his shorts is inverted: instead of the usual black with a white stripe, they are white with a black stripe, and instead of slippers, he has sneakers the same color as his jacket. Killer!Sans' eyes are completely black, with black tears running down to his chin, like the blue threads on Error!Sans's face. Although in Underverse 0.6, his white pupils are sometimes visible. He has a penchant for knives and sharp, knife-like objects.

Killer!Sans uses a sharp knife as his primary weapon, similar to a kitchen knife but with slightly different proportions. He has the ability to teleport, which he can use to dodge attacks or quickly escape from combat. Additionally, Killer!Sans can summon sharp-edged bones, which can be used as melee weapons if necessary. He also uses Gaster Blasters, which can fire laser beams like regular blasters but with the added ability to bite. Like other Sanses, he can use telekinesis to hurl opponents.

Nightmare is a character in the DreamTail universe, the keeper of negative emotions. Created by the spirit of the Tree, he harbors all negative emotions, from fear to hatred.

Nightmare is Dream's brother.

Nightmare was created to protect the dark side of the Tree of Feelings. Along with his brother, Dream, they guarded the tree as guardians.

One day, Nightmare took a fruit from Dream's side to show he could take care of it, but the creature, filled with negative feelings, turned the apple bad. Everyone blamed Nightmare, so he ate all the fruit from the tree. That's when Nightmare became the man we know today...

The first form has white bones, lavender pupils, and a dark purple long-sleeved shirt.

In his second form, he's covered in a shell of hatred and has four tentacles extending from his back. His left eye constantly glows blue/turquoise.

Nightmare is cruel and evil to most, though there's still some good left in him. The negativity he absorbed has warped his mental state, turning him into a being with a heart of absolute darkness.

Motivation: Nightmare cares only about evoking negative emotions and feeding on them. Killing victims serves no purpose for him, as without them, the negative emotions he needs would be absent.

Capabilities:

1. Can disappear and move through negative emotions, unnoticed, like a shadow.
2. Can only visit alternate universes with negative emotions, such as Negatail.
3. Uses tentacles to fight and intimidate enemies.
4. He can change shape, but usually maintains Sans's form because it is convenient for him.
5. Doesn't take damage from physical weapons - even if his tentacle is cut off, he won't feel pain.

Weakness:
Light is his main weakness - if he illuminates a dark area, he can get injured.

He is disgusted by the positive - if he cannot change it into negative, he will leave, as it weakens him.

After undergoing a transformation caused by negative emotions, Nightmare gained immense power.

Date of birth: December 21.
Zz: Sagittarius.