The six humanoid models revealed so far include:
* "Aaron Doral" – Three copies have been shown so far. The first is as a public relations worker for the abortive Battlestar Galactica museum, who is revealed to be a Cylon in the miniseries and is stranded at Ragnar Anchorage by Adama. The second is a suicide bomber who narrowly misses killing Adama and Tigh. The third is one of the 'controllers' who monitors the progress of Helo and the duplicate Boomer on Cylon-occupied Caprica, working alongside one of the duplicate Number Sixes.
Sharon Valerii (Grace Park).
* Sharon Valerii – Numerous copies have been seen although only two have been featured regularly. One (Lieutenant Junior Grade Sharon "Boomer" Valerii) was a sleeper agent aboard Battlestar Galactica who did not know that she was a Cylon, although she suspected it. Another Sharon is fully aware she is a Cylon and accompanies Galactica crewmember Lt. Karl "Helo" Agathon who met her while he was stranded on Cylon-occupied Caprica.
The Boomer aboard Galactica performed a number of involuntary actions due to her Cylon programming, including bombing the ships water tanks and shooting Commander Adama. Despite taking these actions, Boomer has no recollection of them after they happen and often seems confused. After the failed assassination attempt, Boomer was thrown in the brig. While being escorted to another cell she was shot and killed by Specialist Cally.
The Boomer on Caprica originally served the other Cylons faithfully, attempting to make Lt. Agathon fall in love with her. However Boomer ended up falling in love with him and the two conceived a child together. Boomer then effectively defected to the humans, helping Helo escape Cylon patrols and to liberate Starbuck from a Cylon breeding facility. Boomer also stole a Cylon Heavy Raider ship which the trio used to return to Galactica. Upon reaching the Galactica she was immediately incarcerated, as another Boomer had shot Commander Adama. Even in the brig she aided the crew in removing a Cylon computer virus from the ship's systems, then broadcasted another virus to a massive Cylon strike force attacking Galactica, resulting in the destruction of hundreds of Raiders. Since the defection of Caprica-Boomer, a third Boomer has been seen along with Number Six and Aaron Doral (on Cylon-occupied Caprica), discussing the future direction of the Cylon fleet.
* "Leoben Conoy" – Two copies have been shown so far, the first claiming to be a smuggler upon being discovered in the munitions depot at Ragnar Anchorage. Adama kills this copy and has the body taken back to the Galactica. The second is an agent provocateur, an apparently unsuccessful saboteur who is captured aboard a passenger ship, claiming to have planted a nuclear warhead somwhere in the fleet. Commander Adama, having spent time with the first copy, knows how dangerous this Cylon model is. Conoy is adept at psychology, mixing lies with truth making him very difficult to believe or to ignore. He is tortured for information by the strong-willed Starbuck on Adama's orders, but the result is the remaining human fleet is even more vulnerable to attack. The president Laura Roslin realizes nothing he says can be trusted and has him thrown out the airlock, but not before Conoy tells her that Adama is a Cylon.
* "Simon" – Two copies have been shown so far, both at a Cylon breeding facility on Caprica. Simon appears to be a tall, slender, dark-skinned male with close cropped or balding hair, approximately 35 years old. The first copy posed as a human physician treating Lt. Thrace for a gunshot wound in what was supposedly a hospital on Caprica, but he was also performing invasive tests on her reproductive organs. He accidentally revealed himself as a Cylon when he called Lt. Thrace "Starbuck", even though she had not told him her callsign. After killing Simon (by jabbing a shard of a broken mirror in his neck), Lt. Thrace encountered another Simon copy while fleeing the breeding facility, before he was killed by Starbuck's rescue party.
* "D'Anna Biers" – Two copies have been shown so far. D'Anna appears to be a woman approximately 36 years old, blonde hair, and the copy on the Galactica has a regional accent. The first copy poses as a reporter for the Fleet News Service, and is asked by President Roslin and Commander Adama to create a documentary to help the fleet relate to the hard-working staff on the Galactica (after they discover she possesses controversial video footage of a friendly fire incident). With full access to the ship, this D'Anna stumbles across Caprica-Boomer and during an incident with two Cylon Raiders manages to relay a transmission of the documentary back to the other Cylons on Caprica. The Cylon copies viewing the documentary are Doral, Valerii, Six and D'Anna. The D'Anna on Caprica speaks with an "American" accent, as do most of the natives of Caprica. The Galactica crew is completely unaware that the Galactica-D'Anna is a Cylon, and she is currently still at large in the Fleet. D'Anna is played by actress Lucy Lawless. Her role as the D'Anna on Galactica is the first time she has used her native New Zealand accent onscreen in many years.
Number Six (Tricia Helfer).
* Number Six – is a beautiful female model evidently designed for seduction. (The name may be a reference to The Prisoner). In the first episode she is shown having an affair with Baltar (and possibly others) on Caprica, and she was the Cylon "Trojan Horse" who built vulnerabilities into the Colonial defense system mainframe, allowing the Cylons to annihilate the Colonies and deactivate the automated systems of the Colonial fleet. One of the series' most effective plot devices is that the Number Six on Galactica can only be seen by Baltar -- in every episode she appears to torment Baltar in disturbing waking visions, as well as making him 'relive' his last hours with her on Caprica. It is not clear whether she is a product of his incipient madness, as he first thinks, or if (as she claims) she is a projection of a chip that she implanted in his brain, or some other form of mental projection. A brain scan of Baltar in the second season episode Home revealed no chip. She did appear once on Galactica in physical form, calling herself "Shelley Godfrey". There are also several copies of Number Six on Caprica including the copy working with the third Doral copy observing Helo and Boomer. The Cylon religion appears to be of central importance to her, she refers to "God" in almost every episode, and part of her mission is evidently to convert Baltar to the religion of the Cylons' "one true god." Another of the Number Six model named "Gina" infiltrated the Battlestar Pegasus but was later captured by its crew. After being taken prisoner she was tortured and gang-raped by Pegasus crewmen on a routine basis. By the time Dr. Baltar examined her, after Pegasus reunited with Galactica, she was in a catatonic state from the trauma of her abuse. The Pegasus crew kept her shackled to the ground with cuffs on her hands and feet and a collar, which were all connected by a chain that was bolted to the floor. The Pegasus crew felt that Cylons aren't people, and never considered this as prisoner abuse because they feel the humanoid Cylons are just machines.
It is interesting to note that, just prior to her death, Galactica-Boomer revealed to Dr. Baltar that eight humanoid Cylons remained alive, hidden within the fleet. Known models and obvious clones would likely not remain hidden long in the present state of security. Starbuck probably gave a description of Simon, but it's possible a copy of him may be hiding in the Fleet. The only other person in the fleet known to be a Cylon is the reporter-copy of D'Anna, however none of the Colonials are aware that she is a Cylon. Additionally, there are occasional implications that Colonel Tigh's wife may be a Cylon: initially presumed dead, she miraculously appears unharmed in the fleet, she was "tested" during a period when Dr. Baltar refused to reveal any true Cylons for fear of being exposed himself (whether her test was even completed is unclear), she repeatedly causes Tigh to make poor judgement calls, frequently in opposition to the President or Commander Adama. Baltar, in one episode, says to number Six that she is "only human", but this doesn't necessarily mean she isn't a cylon.
