Lego Terminator T-800

The 'Arnold' model came to be known as the 101, which refers to its likeness and skin type.
A deleted scene from Terminator 3: Rise of the Machines reveals that the Model 101's appearance was based on Chief Master Sergeant William Candy, with his Southern accent replaced by the more menacing voice of one of the developers. One part of the scene shows Candy next to a partially-complete endoskeleton, indicating that the Terminators were being developed by humans before Judgment Day. This contradicts information from the first film, where Kyle Reese refers to the Model 101 as "new", replacing the older rubber-skinned 600 series, also seen in Terminator Salvation. The T-800 is shown to be stronger both physically, tearing a malfunctioning T-600 in half, and manufacture, being the first model to be manufactured using titanium alloy. However, titanium loses strength when heated above 430 °C (806 °F) which later prompted Skynet's decision to use Coltan, which is also referred as columbite–tantalite, for better heat resistance as its metal base as stated in "Terminator-The Sarah Connor Chronicles"; it is also used for the T-850 and T-888 models. According to Terminator Salvation, the T-800 was the first terminator to have a human styled skeleton built using coltan and titanium alloy. The earlier Terminators had a bulkier appearance.
An entirely different origin of the Model 101's physical and vocal templates was provided in the novel T2: Infiltrator (published prior to T3), in the form of former counter-terrorist Dieter von Rossbach. The reason stated for copying Dieter was that Skynet was looking in the old military files for someone whose body could effectively conceal the Terminator's massive endoskeleton.
In the fourth film Terminator Salvation, actor Sam Worthington played the part of "Marcus", a 2003 year death row inmate sentenced to die for somehow causing the death of his brother and two policemen. Just before his execution he acceded to requests from Dr. Kogan (also apparently dying from illness and played by Helena Bonham Carter) for the use of his body by Cyberdyne Systems for the purposes of scientific research. After execution, he is next aware of reawakening in a Skynet bunker under attack by humans led by John Connor, although he is initially completely unaware that he is not human. In the case of this model Terminator, Skynet made a composite cyborg that is internally part human, part machine — including a human heart — rather than the Schwarzenegger-style cyborgs that are only human in their surface coverings. This difference is ultimately significant in the film. The "Marcus" Terminator is possibly less capable than the classical Terminator but ultimately wins out because Skynet — taking on the visage of the now-dead Dr. Kogan — mistakenly reproduced the memories, emotions and guilt of the original death-row template in too great a level of detail, resulting in the Terminator deciding to fight on the human side.