Reaper Sans

addicted to coffee.
He can't stand lies and can sense them a mile away.
prefers black humor.
In his free time, he will visit Geno and later, when he realizes his feelings for Geno, he will pursue him by any means and with all the hints and flirtations

teleports.
Everything he touches dies (except Geno)
can turn into a raven, as this is his second full form.
can fly too.
It's clear that he is immortal, but he can feel pain.

skeleton
Reaper Sans - as a true god and reaper of death, he wears a black magical robe and a small gaster blaster on a rope around his neck. He also has a rope on his belt.
with large black wings like a raven behind his back.

Brother - Papyrus, also the god of death and sends souls on their final journey. Still as funny as the original.
The Creator, Gaster, the god of magic, created Sans and Papyrus from a black hole (since all gods are born from a star, it's logical that the god of death should be born from what remains after a star's death—a black hole. But Gaster miscalculated his power and created two skeletons instead of one god of death). He doesn't consider himself their father. He's strict, and Sans fears and respects him.