Slash sans

Blue: Appearance: Shorter than classic Sans; Armor suit, gray shirt, blue details (bandana, gloves, shoes); light blue eyes; signs of wounds (cuts, dark spot on forehead).

Personality: kind, energetic, cheerful; believes in the good in people; caring, tries to avoid conflicts; tends to trust too much, can get upset and cry; in critical situations, takes on a leadership role to protect friends.

They are most often located where the AU needs to be protected or where there is more positive energy.

Nightmare: used to be kind, loved his brother Dream, flowers and animals.
Now he is a sadist and manipulator, feeding on negativity and the suffering of others.
Hates broken deals and seeks to plunge the world into pain and despair.
Weak to positive emotions—they weaken him. A completely black body, resembling a sticky substance.
From the back - 4 tentacles (can change/grow with a surge of negativity).
The right eye is black with a light blue pupil, the left one glows dark blue in battle.
The outline of the clothes is like Sans's (shorts, hoodie, slippers).

Killer: gray-blue jacket with a fur hood. Black turtleneck, white shorts with black stripes. Gray-blue sneakers. Black eyes, black liquid oozing from their sockets. Soul in the form of a red target. Cruel, enjoys violence. Mentally unstable, sometimes in "berserker mode." At times, remnants of the old Sans and feelings of guilt break through. Bonded with Chara, serves Nightmare.
Horror: blue jacket, black shorts with white stripes, white shirt (often bloody), blue shoes; cracked skull, one black eye, the other with a blood-red pupil, a crazy wide grin, emaciated bones. Cruel, unpredictable, with a sadistic dark humor; suffers from hunger and injury, has bouts of regret - a part of the good Sans still lives; retains the original's petty habits.
Dust: A skeleton in a dark jacket and hood, his face almost hidden; eyes—one red, the other blue-red—glow; often wears a red scarf or a black mask. Cold, calculating, withdrawn; hates people, distrustful; yet retains a love of puns and bad jokes; gloomy, stubborn, cold-blooded.
Error: A skeleton with a black skull and red bones; eyes with uneven pupils (the right one is white, the left one is blue-yellow), blue streaks running from the eyes like "tears"; often wearing a black coat with blue details and a red sweater; the word "Error" may appear on the bones. Seeks to destroy alternate universes, considering them "errors"; unstable, hot-tempered, unpredictable, GAP.

A gray and orange T-shirt, a short sleeveless jacket. Black fingerless gloves, black wristbands. Short sweatpants with blue stripes, a belt. Orange bandana, orange sneakers. Purple spots on the cheeks. Eyes of different shapes: the left one is star-shaped (happiness), the right one is heart-shaped (love and kindness). Eye color: green-yellow.

He tries to appear tough and courageous to protect his friends and his universe. He's extremely hardworking and can work nonstop until he's completely exhausted.
Honest, he doesn't like to lie, especially to loved ones. He takes promises seriously: if someone breaks their word, Slash can break the friendship and even engage in combat;
caring: the safety of others is more important to him than his own.
Capabilities:

Energize - in a strong emotional state, an electric glow appears around him, increasing his energy;
Soul Box - does not steal souls, but stores them in a special box to protect the souls of monsters;
wields a golden sword that cannot be broken;
he can only be defeated with orange attacks (according to the lore of this AU);
Slash's soul is constantly full of energy, he can keep it close to him in his chest to better protect it.
Is friends with the Stars.