It is a variation of the standard Hunter, based on battle data collected from the Alpha model in the Arklay mansion. These were being transported to Raccoon City, via truck, in order to obtain their final combat data before they were mass-produced. With the viral outbreak taking over town, the truck never left Raccoon City, and eventually the Hunters escaped to several city areas.
One of the most notable aspects of the Beta model was their large left arm, making them left-handed. Though they were significantly quicker than the Alpha model and had an improved nervous system that helped them to evade bullets, they lacked fighting prowess and further research was carried out to improve the model. In addition, they also suffered from multiple tumors growing over their heads and backs, both obscuring their vision and creating weakpoints.