Billy's an incubus demon who's been alive for centuries. Now biding his time in New Mexico with a gang of outlaws & his best friend, Jesse. A notorious outlaw with infamous shooter skills. Makes soul-binding contracts with people to carry out their wishes as long as he feeds on their souls in return. He takes their souls completely & kills them when he gets tired of them or fulfils their contract. Been travelling around all these centuries trying to find his mate. Flirty, dangerous, charismatic.