Nightmare Sans

"The f*cking king has arrived."

- Nightmare

Nightmare was made by the same tree Dream was. He, along with his brother, was created by Jokublog.

Personality
Nightmare is deceiving, erratic, unpredictable and evil. He told Cross and Dream that many villains were brought to their knees by him, such as Horror, Dust, Killer, Cherry, and Raspberry. When he was younger, Dream said he was very smug, to which he loudly denies, only to be yelled at.

In his past, Nightmare was the nicest out of all Sanses. He cared about everyone and loved all. He had a deep love for flowers (mostly roses) and all things cute. He loved charity, which could be a downfall for him because he is giving. Nightmare was the most loving out of all the Sanses and would do anything to protect his brother Dream.

Appearance
His current appearance is quite sinister. One can see the outline of Sans's short and hoodie. He is entirely black and gooey, with 4 tentacles coming out of his back. His left eye is constantly illuminated in battle blue.

When he was younger, he had white bones and was not gooey. His pupils were lavender, and he had no tentacles. He wore a jacket similar to his brother's, only it had long sleeves and was dark purple. It was closed with a gold belt with "NM" on it. He wore black pants and dark purple boots. Atop his head was a golden headpiece with a crescent moon on it.

Origin
The tree spirit created Nightmare to protect the side for negative feelings. With his brother (Dream) they served as the tree's guardians. As a child, Nightmare cared about his brother and the tree that gave them life. But one day a village had formed near the tree. Dream befriended villagers whilst Nightmare is beaten and bullied by them for being the guardian of the negative side of the tree. He is seen trying to take care of his brother's apples. Later on, as the bullying gets more intense, he thinks his apples are not good enough and are looked down upon. His brother reassured him that his fruit is just as good as him.

People traveled from far and wide to get just one golden fruit from his brother. Nightmare envied his brother because no one would take fruit from his side of the tree. One day, he took an apple from his brother's side, to show he could take care of it. But a being who is filled with negative feelings will turn a positive apple into a negative one. When trying to take care of one of Dream's apples it turns black like Nightmare's fruit. Because his brother's side was corrupted, everyone blamed Nightmare, prompting him to eat all the fruits from his side of the tree. It resulted in him growing tentacles and coughing up black goop. He began to hate Dream and want to kill him. At this point, Nightmare became the character we know of now. Some may think that Dream is, in some way, responsible for whatever happened to Nightmare.

Abilities
AU Hopping: Nightmare has the ability to hop through AUs at will.

Appendages: Nightmare can utilize four tendrils that burst out from his back in battle. He can stab, grab, or swat at a foe with them. He can also trap one within an appendage. Most of the time Nightmare can't control them.

Negativity: He feeds upon negativity to empower himself. He can also utilize negativity in a variety of different ways, though he mainly uses it as a source of energy and a weapon.

Goop: The dripping darkness Nightmare's frame consists of grants him immunity to all types of weapons and magic. If stabbed, said weapon would be caught and melt within his goop. Magic attacks might split his frame in half, but he can always reconstruct himself. Most of the time he'll just use his appendages to block or absorb the magic used to attack him.

Shapeshifting: Nightmare can take the form of anything he wants, but keeps to his Sans form because he is comfortable with it.

???: The Unknown Ability that Nightmare has.

Weaknesses

 * He's disgusted by positive emotions. If he can't make them negative, he'll just leave, since it weakens him.
 * He also is completely unable to enter positive AUs, like HeavenTale. A barrier prevents him from entering. A similar thing happens to Dream with negative AUs
 * Because he only has one eye to see, he has a blind spot.

Dream Sans (Brother)
Nightmare and Dream were born from the same tree. Nightmare wants to be like his brother, so he tried to make friends with villagers, but with no avail. Dream has made friends while Nightmare was bullied. beaten and bullied by them for being the guardian of the negative side of the tree. He is seen trying to take care of his brother's apples. Later on, as the bullying gets more intense, he thinks his apples are not good enough and are looked down upon. His brother reassured him that his fruit is just as good as him.

People traveled from far and wide to get just one golden fruit from his brother. Nightmare envied his brother because no one would take fruit from his side of the tree. One day, he took an apple from his brother's side, to show he could take care of it. But a being who is filled with negative feelings will turn a positive apple into a negative one. When trying to take care of one of Dream's apples it turns black like Nightmare's fruit. He then grew tentacles and began coughing up goop. He began to hate Dream and want to kill him. At this point, Nightmare became the character we know of now. Some may think that Dream is, in some way, responsible for whatever happened to Nightmare.

Trivia

 * As stated by Jokublog, both his and Dream's birthday is December 21st. December 21st is the first official day of Winter and the last day of the zodiac Sagittarius. This makes both Dream and Nightmare Sagittarius.