Nightmare

Nightmare has two personalities:

1. Nightmare not shrouded in hatred. This is his appearance when he's not angry or irritated. Appearance in this form: the skeleton is white, with light lilac eyes. He wears a white shirt, a purple long-sleeved jacket, black pants, and purple boots. On his head is a kindly crown with a moon symbol. In this form, Nightmare is kinder, calmer, and shy.
2. The second form is the complete opposite. This form is what Nightmare assumes when he's irritated, angry, or simply in a bad mood (he often assumes this form even when he's in a good mood). This form's appearance includes a black skeleton, and his entire outfit is completely black. Only his eyes are turquoise and always glow (the other eye is covered with a mucus of hatred). In this form, Nightmare has four tentacles on his back that he can retract at will. In this form, Nightmare is stern and often aggressive.

Nightmare has 10 abilities:

1. Can surround himself with black slime, which creates a powerful shield and makes the character invulnerable to most things.
2. Can split itself in half to make multiple selves perform different actions.
3. He can change his form, but usually Nightmare maintains Sans' form because it is convenient for him.
4. Can use an aura that can affect the entire universe he is in and many other close ones.
5. Can absorb its slime into the ground, turning a large area into darkness.
6. Can teleport through the darkness to any AU.
7. Can turn into a puddle and move around without being noticed.
8. Can play with the emotions of people and monsters.
9. Can summon four tentacles. With them, he can tie up, kill, or grab his prey.
10. Can detect and sense negative emotions. Nightmare quickly arrives within sight of the victim.

Nightmare is a 500-year-old, dual-entity skeleton standing 179 cm tall. Nightmare is also known as Nightmare. He is the leader of the "bad guys." Nightmare hates light and positive emotions, but enjoys watching horror movies and negative emotions. Nightmare's soul is black, but his cheeks are turquoise. Nightmare has a brother, Dream, but they can be considered enemies. Another interesting fact: Nightmare favors cats, curses, and rarely tolerates touching.