Six renegade replicants

This has been fixed in the Final Cut. It is mentioned by Harry Bryant that there are six replicants loose on Earth. In the original version, it is also mentioned that one of the replicants got 'fried'.

In the "Final Cut" version however, the overdubbing states that "two of them got fried".

• Roy Batty - Is a commando and suggested by Bryant to be the leader of the escaped group.

Leon - A soldier and manual laborer.

• Zhora - A sex worker retrained as an assassin.
• Pris - A 'basic pleasure model'.
• Hodge - One of the replicants who got 'fried'.
• Mary - The other replicant who got 'fried'.

As a result, five replicants are still alive. Rick Deckard is asked to hunt down Roy, Leon, Zhora and Pris, all of whom appear in the movie. Whether there are really six replicants or just five, is still debated among fans.

Roy

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Pris

Zhora

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Leon

The replicant that never was

The original release production audio has Bryant saying "I have five skinjobs on the street". The workprint had it overdubbed to "four". The dub is clearly a studio executive. It was intended to be a place holder until they could rerecord it with M. Emmet Walsh. However, due to the creation of the Voice-over and "Happy Ending" running the time to finish the film out, like many things, the line was never rerecorded. One of these five replicants is said to be Mary. Mary appeared in an early script and was even cast with Stacy Nelkin -- who had screen-tested for Pris -- in the role. The scenes for this character were dropped due to budget restraints. At the time the filmmakers decided to leave out the character, they had already filmed the Bryant/Deckard scene which states there were six replicants. According to the script the story goes like this:

Deckard kills Zhora and then spots Rachael looking on. He chases Rachael, only to be beaten up by Leon. After Rachael kills Leon, Deckard buys a bottle of Tsing Tao and has to warn her with a glance when Gaff approaches. Gaff takes him to Bryant, who tells him that there were "four to go" (Roy, Pris, Mary, and Rachael).

When they eliminated Mary from the script, they had a problem: Bryant should say that there are "three to go" (Roy, Pris, and Rachael). Instead of reshooting this scene, they moved it and the scene of Deckard buying Tsing Tao ahead of Leon's death, so that the "four to go" would be Roy, Pris, Leon (not Mary), and Rachael. They nearly got away with this, but a few problems remained:

1. When Deckard is talking to Bryant, he shows wounds from his fight with Leon, although he hasn't had the fight yet. This has been fixed in the Final Cut.
2. Since he now buys his bottle before he fights Leon, it should be there while he's chasing Rachael and fighting Leon (it's not). The bottle mysteriously reappears when he gets back to his apartment. Considered a beloved flaw by Scott.

This problem is purely the result of Bryant telling Deckard, "I've got four skin jobs walking the streets" but only accounting for one of the remaining two.

It is rumored that during dubbing, Ridley Scott initially had Bryant's line changed, but then changed his mind and left it with "...six replicants".

Conclusion

You can choose either to believe Bryant's comment about six replicants being an error and that there were always just five replicants. One was 'fried', and Deckard is looking for the last four. In this scenario, Rachael is just another harmless replicant who manages to escape Tyrell Corporation.

OR...

If you choose to believe there are six replicants, there are possibilities that Deckard is the sixth escaped replicant, or Mary is, if you choose to include her character. Otherwise, the sixth replicant is simply unknown.

OR... the "real deal"...

Since Bryant's line in The Final Cut version of the movie--which Ridley Scott had 100% control over--was changed to say TWO replicants got fried while attempting to break into the Tyrell Corporation, it appears obvious that in the end Scott wanted there to be only four replicants left "on the street"--Roy, Leon, Zhora and Pris, with Rachel then being added by Bryant when he talks to Deckard after Zhora's retirement. This does away with the mysterious "sixth replicant", and any possibility that it's a reference to Deckard.