Geno!Sans

Geno!Sans, also known as Aftertale!Sans, often referred to as Geno by the narrators, is a Sans who survived the genocidal wrath of Chad, who successfully killed almost every monster in existence in his timeline, including his brother Geno!Papyrus. He adopted BB!Papyrus, whom he found out had a really rough life.

Appearance
Like a typical Sans, Geno is a short, largely-built chubby skeleton. He has a rounder skull, a triangular nose, and has pupils.

However, Geno has some noticeable differences that tells him apart from the other Sanses; he has scarring over his right eye with some glitching over it and a singular scratch scar going over it as well. He may sometimes bleed from his mouth and/or chest if he's angry or severely distressed.

Geno typically wears a blue jacket, a white t-shirt, and black pants with singular white stripes on each leg. Before giving it to BB!Papyrus, Geno wore Geno!Papyrus's signature red-orange scarf.

He usually expresses anger by making his pupils disappear. However, when angry enough or using telekinesis, Geno has a cyan pupil ring in his left eye.

Personality
Geno, like most other Sanses, is a laidback, somewhat lazy skeleton. Despite this, he is very overprotective of BB!Papyrus, to the point he is considered a mother-hen, like many other Sanses. He sometimes shows sign of PTSD, specifically when he sees a Papyrus gets hurt or if their skull detaches. He is "seen" talking in lower case most the time, rarely using capital letters.

Pre-SHAETALE
Geno lives peacefully with his brother, and everything's peaceful. One day, a human, Chad, falls and begins a mass genocide, killing monsters without trouble. Chad kills almost every monster, including Papyrus.

Geno, wracked with grief and wanting to put an end to to the genocide before every monster goes extinct (and the humans might be in trouble too), fights Chad. He wins, thus making Chad retreat.

Debut
Towards the end of the Bad Brother Arc, Geno is introduced to BB!Papyrus, a Papyrus who has an awful life due to his brother BB!Sans. After hearing of his situation and how rough it was, he immediately adopts him and takes BB in.

Abilities
Geno has all standard monster and skeleton monster abilities. He also has abilities exclusive to the skelefam.

KARMA Magic: As a Sans, Geno's magic is entirely KARMA-based; the higher the target's LV, the more effective his magic is. His KARMA magic acts like a poison, taking health slowly overtime rather than all at once. It also ignores the meta invincibility frames. Even with an ATK of 1, his KARMA magic is very strong against those at high LV.

BB!Papyrus
Geno, after hearing BB!Papyrus's story, immediately feels sympathy and quickly adopts him, and treats him like he had his brother. He is very careful to BB's shy and easily-frightened nature, making sure not to TP to him and making sure he doesn't see electricity. He is very patient with BB and showers him with compliments and affection. If they're visiting Shae and her family and it's storming, Geno comforts BB and tries to distract him from the lightning.

Of course, Geno is very protective of BB.

Chara
Geno, at first, is very untrusting towards them, immediately getting defensive when they're around. However, Shae assures him they're not evil like their Geno counterpart. The two are on good terms, albeit having a friendly rivalry.

Trivia

 * Geno is the second Sans counterpart to appear in the AU, the first being BB!Sans.
 * Like all the other Sanses, Geno is left handed.