Roy is immediately characterized by his imposing stature; not the largest of the rogue Nexus-6 replicants, but intimidating all the same. Physical attributes include his blue eyes and white, bleached hair.
Batty wears a black trench coat, and a gray shirt tucked into his pants.
On his skin, tattoos mark where combat enhancing attachments would go during combat operations Off-world.
The "Prodigal Son" of Eldon Tyrell, Roy returns to his "father" by hijacking an off-world shuttle with the assistance of some other replicants (Leon, Pris, Zhora and two others). These renegade replicants kill the crew and set a course for Earth. Roy begins by seeking a longer life, Failing this, he ultimately destroys his own maker.
After a failed attempt to break into Tyrell's headquarters (which results in the deaths of the two unnamed replicants), Roy and Leon had previously been investigating ways that they could lengthen their lifespans by viciously interrogating Hannibal Chew. Chew directs them to J.F. Sebastian, and Pris goes to meet J.F. first. Later on that day, Zhora is killed by Blade Runner Rick Deckard and Leon is killed by Rachael.Roy arrives the next morning at J.F.'s home, the abandoned Bradbury Building. He tells Pris about Leon and Zhora's deaths, and is overwhelmed by emotion and barely able to share the news. Learning that J.F. is playing a lengthy game of chess with Eldon Tyrell. Roy shares the winning moves with J.F., who takes him to the Tyrell Corporation to meet with the man himself. Roy and Tyrell briefly debate the possibility of extending the lives of replicants, and Tyrell concludes that it is impossible. Roy asks Tyrell for forgiveness of his sins, but Tyrell seemingly does not, telling him that he's also done wondrous things; it does nothing to comfort Roy. Roy then kills Tyrell, and then kills J.F. before retreating back to the Bradbury Building.
Deckard arrives at the Bradbury Building and "retires" Pris. Roy, arriving moments later, begins to play a cat-and-mouse-game with Deckard, frightening and taunting him until he finds Pris' body, when he breaks down into tears. Roy begins to taunt Deckard more violently, breaking two of his fingers as vengeance for Zhora and Pris, then encourages Deckard to join him in fits of violence after Deckard hits him with a pipe. During this scene, Roy shoves a nail through his malfunctioning hand, a foreshadowing of his inevitable demise. Roy then forces Deckard to retreat to the roof of the Bradbury Building.
On the roof, Deckard attempts to escape Roy by jumping to another rooftop, but almost falls short, clinging desperately to a girder extending off the side of the building. Deckard, trapped, spends his perceived last moments hanging onto the roof as his hands slip, a fatal fall almost certain. After musing about the nature of what it is to be a slave, Deckard begins to fall, casting a final act of contempt at Roy by spitting at him. Despite this, Roy grabs Deckard and drags his body over the edge. Moments later, as his four-year lifespan draws to a close, Roy reflects on the moments he has been privileged enough to view, like "C-Beam glittering in the dark near the Tannhauser Gate." He dies shortly afterwards. A replicant dove flies out of his hand into the night; a possible symbol of the continuation of his soul after death.