(Post-RE0 Version)

Billy is a main protagonist from Resident Evil 0. He is a former US marine lieutenant who became a runaway convict after an incident with his unit attacking a village and being blamed for it. During his transport he'd break free once it was intercepted by zombie dogs resulting in him soon crossing paths with STARS member Rebecca. At the same time he would uncover the horrors behind the attack from one of Umbrella's own founders, managing to stop their plot of revenge which would only become a prelude of other horrors soon to come. By the end, he would split with Rebecca and would now go into hiding from the government.

He is a middle aged man with a broad build, short brown hair combed back and brown eyes. In his civilian attire he sports a gray tank top exposing tattoos on his right arm. He also wears blue jeans and brown shoes. He once wore the very dog tags he had during his time in the military.

He has relative experience in fighting due to his training as a US marine, even able to handle his own going up against the various viral infected creatures.