Had an idea for this duo recently, together they are responsible for adding souls to the armies of Hell:
Booker (haven't decided if he is an actual demon or a human that went through a ritual or something):
Booker has a symbiotic connection with the a powerful hellhound by the name of Golgatha (connection appears visibly as a hellish leash that seems to emerge from the palm of his right hand). The activation of this connection is said to have burned Booker’s eyes into nothingness, replacing them with a pair given to him upon receiving Golgatha. These eyes allow him to kill someone by making eye contact with them (though this ability is taxing and requires time to recharge).
Golgatha:Despite her size (about that of a small car), Golgatha can easily keep up with and surpass the top speed of a vehicle and just as easily topple a tank with a shoulder-check. Her enhanced agility allows her to jump great heights and even climb at great speeds. Her flesh is pinkish, with sparse jet black hair, and glows with hellfire-infused muscle fiber. She is incredibly strong and savage and can sustain large amounts of damage without flinching. Her teeth and claws are powerful enough to rend wood, brick, superhuman flesh, and most metals. Golgatha has a superb sense of smell due to her not having any actual eyes. It appears her “vision” is made up of a dull 3D mapping of where her scents originate. It is said that through these means she can track and detect anyone over any distance and can even detect and interact with astral forms.
FEEL FREE TO DRAW THEM IF YOU WANT!