-|•𝗞𝗜𝗟𝗟𝗘𝗥 𝗦𝗔𝗡𝗦•|-

A skull with a noticeable crack is a consequence of a battle with a strong opponent.
Eyes: The left eye is completely black with a blood-red pupil, the right eye is empty.
Clothing: blue sweatshirt, black shorts with white stripes, white shirt, blue tennis shoes. Clothing often appears dirty and bloodstained.
Weakened bones are the result of prolonged starvation.
A wider and more psychotic smile is the result of a head injury. Always hungry

Skeleton. Like the original Sans, he's a skeleton.
Clothing. He wears a blue hoodie with a white hood and shorts, both covered in a layer of dust. This dust is the residue of killing other monsters, which he committed to increase his level and stop the genocide.
Eyes. He has mostly blue eyes, but there's a red ring around his left eye. This causes purple steam to emanate from his socket.
Overall appearance: His appearance is more menacing and worn compared to the original version.
He is rude and crazy because he killed everyone in his universe, he doesn't like communication and talks to his "brother" whom only he sees

In his current form, Nightmare appears as an entirely black skeletal monster with the outlines of clothing (shorts, a hoodie, and slippers). Four writhing tentacles extend from his back, which he can retract at will. His left eye constantly glows blue. The character's body is unstable and "melts," which is related to his nature as a bundle of negative energy.
He's angry, hot-tempered, hates affection, or something like that, and loves dark chocolate. If he's surrounded by a lot of love and tenderness, he'll start to "melt," and he'll need to eat his negativity apple to get back into shape.

His appearance reflects the character's "glitchy" nature: his skeleton is deformed, and his color scheme consists of black, dark red, dark blue, yellow, and orange.
Some details:
The body is black, the legs are red.
The bones of the hands are also multi-colored: the metacarpals are black, the proximal phalanges of the fingers are red, and the middle and distal phalanges are yellow.
The teeth are yellow.
The eyes are asymmetrical. The sclera is red. One eye has a small yellow pupil, while the other has a circle with yellow, blue, and black stripes. The right eye is usually smaller than the left.
The markings are light blue teardrop-shaped stripes that run from the eyes to the chin.
Glasses - He often wears red round glasses due to vision problems he developed after being Jeno.
His clothing consists of a parka jacket with blue patterns on the sleeves and yellow pockets. He wears a red shirt (possibly a sweater) underneath. His wide, black pants are uneven and have red stripes at the bottom: the left side has a blue gradient and is sewn together, while the right side appears to be a blue cuff sewn onto the pants. He wears a long blue scarf and mismatched black sandals. Error is believed to steal clothes and then stitch them together.
Environment - White "ERROR" text is often visible around it, and minor visual glitches may also occur.
He hates being touched, which is why he glitches, he loves dark chocolate, he doesn't like Inca, and everything else.

T-shirt. Black.
Jacket. White, with short sleeves and a hood; in earlier versions, unbuttoned.
Shorts and a belt. They have the letter "X" on them.
Scarf. Long, secured with two crossed belts.
Heart locket. Gold, with a design inside.
Quite peaceful and sweet, he'll stab someone with his huge red knife when attacked. He's quite shy, but when necessary, he's resilient and ruthless. He's generally kind and warm-hearted.

Killer Sans - Killer! Sans looks like regular Sans
Some details of appearance:
Gray jacket with cream-colored fur on the hood.
Shorts are white with black stripes.
There is a red circle in the chest - this is the soul of Sans and Chara.
Mascara flows from his eye sockets, which he can control.
At certain moments, depending on the situation, barely noticeable pupils become visible in the eye sockets. This most often occurs when Killer experiences strong emotions, such as anger.
He's crazy, loves chaos, which he creates himself, and has never shown compassion or love. He loves going on missions and killing monsters while on missions, and he also kills people.