Bullet is an AI companion that accompanies Ellis on his search for the missing boy. Ellis can issue him commands, ordering him to search or to return to him, as well as praise or reprimand him. Ellis can also give Bullet treats if he has any.
Ellis can also call his veterinarian, who advices him to reprimand Bullet if he is being stubborn.
Before the start of the game, Bullet is given to Ellis by his police department, whom comments that Bullet has been through a lot, just like Ellis has. Bullet later accompanies Ellis during his search for the missing boy.