Killer Vanya

The original name of the Killer universe (or rather, AT) is Undertale: Something New. However, the name Killertale is also welcome.
It is believed that Killer arranges "killing time" (killing time).
Killer's blaster is white with black hatred shining from his eyes, not the other way around. It's a fandom mistake that he doesn't have any at all.
The killer is depicted as having a real knife, but cannot summon red knives like Storyshift!Chara can.
Chara's spirit remains within Killer, as does their soul—a fusion and balance between the souls of monster and human. However, Chara doesn't bother Sansa for the most part while he's mad and murderous. Chara only reveals itself when Killer becomes calm and balanced.
The exception is the good ending, where Killer kills Chara, freeing his consciousness from their body.
Killer doesn't have a RESET button. He only acquired one after killing Chara, thereby regaining control of his soul (which leads to good endings). Killer also never uses SAVE skillfully.
Killer loves cats because of his sister.
Killer is very good at card games, which is what he is implemented in

Has all the abilities of the traditional Sansa, but they are more dangerous and sick - the bones and teeth of the Gaster Blasters are sharpened;
Instead, when he is wounded, he bleeds the same black substance, but does not notice it.
Similar to his eyes, the sockets of his Gaster Blasters also widen in black.
In the fourth state, his bones turn red, both in his body and when he attacks.

Appearance
At the end of the Genocide Path, Chara bribes Vanya, telling him there's no point in faking a smile and instead, to strengthen himself and move forward. A broken Vanya agrees, and Chara possesses him. After the reset, Vanya tries to pretend he doesn't care about others, as if everyone else will forget, but killing Bredvat leaves him with a strong sense of guilt. After several Genocide Paths, Vanya's soul merges with Chara's, making him colder and more indifferent.

The killer looks like the original, but his jacket is black and blue with a fur-trimmed hood, a black turtleneck that always reveals his changing soul, and white pants with black stripes. Instead of slippers, he wears black sneakers. His face changes depending on his state of mind.