Deckard's unicorn dream sequence, inserted into the Director's Cut , coinciding with Gaff's parting gift of an origami unicorn is seen by many as showing that Deckard is a replicant – as Gaff could have accessed Deckard's implanted memories.   The interpretation that Deckard is a replicant is challenged by others who believe the unicorn imagery shows that the characters, whether human or replicant, share the same dreams and recognize their affinity,  or that the absence of a decisive answer is crucial to the film's main theme.  The inherent ambiguity and uncertainty of the film, as well as its textual richness, have permitted viewers to see it from their own perspectives. 
That also goes for the characters in the film, though we have an idea about who supporting players such as Robin Wright ( House of Cards ) and Jared Leto ( Suicide Squad ) are playing now, thanks to their appearances in the Blade Runner 2049 marketing thus far. With a cast as stacked as this one, counting people such as Barkhad Abdi ( Captain Phillips ), Mackenzie Davis ( The Martian ), Dave Bautista ( Guardians of the Galaxy Vol. 2 ) and Edward James Olmos (reprising his role as Gaff from the original Blade Runner ) amongst its ranks, there’s no need to rush and introduce all these players at once, either.
As if it wasn’t unlikely enough that McCoy’s pursuit of a group of rogue Nexus-6 replicants would so closely mirror Deckard’s, both actually take place at the same time. When you meet with Tyrell, Rachael will mention ‘the other Blade Runner’. Study a photo taken in Animoid Row and you’ll see Deckard in the background showing the snake scale to the fish woman. It’s a neat touch, but only highlights how unoriginal the story is. Perhaps the similarities between Deckard and McCoy are intentional: a popular fan theory posits that all blade runners are actually replicants.