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If the liquid metal T-1000 can become anything it touches, why does it choose to be humanoid most of the time? Humans aren't very efficient; is there anything stopping it from becoming some other thing that can shoot more guns at a time and run faster?

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    It's not. On at least one occasion it has three hands (in da chopper) – Valorum Sep 10 at 10:39
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    @Darren Human != humanoid. Asking if T-1000 is human, then the answer is clearly no, as T-1000 is not flesh & blood etc etc. Humanoid refers to the more general human-like shape (two arms and two legs, a torso, a head etc), so it's more clear (perhaps concise was the wrong word there). – Rebel-Scum Sep 10 at 14:14
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    Since it looks like you are asking for an "in universe" answer, I will leave this as a comment. As for the movie-creation part: It is well known that human-like non humans is really really scary. The uncanny valley is a known thing. Thus for the movie to be a better thriller, the robot should be alternating between very human-like and human-like-but-not-at-all because it is the changes between them we find extra scary. Ref the first time you realized John's mom actually was the T1000... It is a part of what makes the movie successful. – Stian Yttervik Sep 10 at 16:18
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    If you're going to be looking for someone, it helps to blend in. A five-armed-bazooka-wielding-12-foot-tall demon might encourage the target to hide better. – Misha R Sep 10 at 19:33
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    Because it would probably be expensive to shot movie with fulltime cgi at that time – Askar Kalykov Sep 10 at 19:40
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The T-1000 has no compunction about being non-humanoid (or at least not possessing the statistically usual number of arms, heads and legs) when it suits its needs.

  • It forms stabbing and grasping tools that extend from its hands and arms.

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  • It's perfectly happy to have four hands or form a new head.

    enter image description here

It also performs superhuman feats such as running at 40mph, melting through walls and pouring itself in through ceilings but in the main it's operating human-scale machinery and weaponry (as well as acting as an infiltration unit) so it's best off emulating a human most of the time.

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    Humanoid doesn't mean that it's identical to humans, just similar, and minor differences like these don't conflict with it. The $6M Man could also run really fast, and amputees have hooks in place of hands. – Barmar Sep 10 at 15:00
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    I haven't, but if someone were born with that mutation I wouldn't think they weren't humanoid. – Barmar Sep 10 at 15:07
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    Consider Inspector Gadget -- isn't he humanoid? – Barmar Sep 10 at 15:08
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    Downvote. None of this examples is non-humanoid. – motoDrizzt Sep 11 at 7:51
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    @Valorum you're absolutely wrong about this. The definition of the adjective "android" is "having human characteristics or form; resembling human beings." dictionary.com/browse/humanoid The suffix -oid means "Of similar form to, but not the same as." en.wiktionary.org/wiki/-oid – RonJohn Sep 12 at 21:38
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As a Terminator its primary mission is infiltration and assassination. While it probably can make itself into a big cat that can run faster, that wouldn’t be very covert. Also, it needs physical contact with things to copy them.

We see it disguise itself as a floor in Judgement Day.

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It wanted to stay hidden and then assume the form a guard. And while it is difficult to destroy, it isn't indestructible. Too much attention and the government would try to end it.

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    It's also more practical for it to be in human form for controlling/driving vehicles – SpacePhoenix Sep 10 at 6:20
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    Also notice that its primary method for finding John is conducting interviews/interrogations and also posing as his adoptive and later actual mother. – Todd Wilcox Sep 10 at 11:41
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    I'm not sure becoming a big cat would make it faster. Humans are the fastest land animals over distance. – user120357 Sep 10 at 12:56
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    @KeithLoughnane Humans are only faster over (long) distance due to endurance, assuming that a killer robot doesn't get tired, other forms would definitely be faster when travelling on foot. – DBS Sep 10 at 13:12
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    @KeithLoughnane, man v horse suggests otherwise – Separatrix Sep 10 at 14:39
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I would imagine a lot of it has to do with its programming. Don't forget - at the end of the day it is a machine, and therefore governed by its program.

It also comes from the future - so Skynet has a different observable world than the "present day" - which may factor in with the programming.

I would make an assumption that his runtime protocols would range something like this:

  • Blend in as human
  • Anyone who discovers you are not human, must be terminated
  • Terminate primary target(s)

Of course this is wild speculation and conjecture.

Terminators are infiltration units - so the less attention they draw to themselves the better.

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    It might not even have "blend in as human" as an explicit protocal, but rather as an emergent behavior. If you must terminate everyone who discovers you, it's more efficient to simply not have to terminate every person you encounter. The simplest solution to that is to appear to be human most of the time. – Martin Carney Sep 12 at 19:22
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If I remember correctly, the T-1000 needs to transform into something in "its size" and need to use all its liquid metal.

He can't transform into something small because of that and he can transform into something bigger if he can create holes in his shape but he can't transform into something very big that need more liquid metal then he have (without holes).

  • Sure, but a large tiger or a gigantic swirly wheel thing with nine hands would also have a similar amount of material – Valorum Sep 10 at 19:04
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    Ah yes... Terminator 47: Apocarnival where a t1000 is trying to run down the Connors while they are on vacation. The twist comes at the end when a group of t1000s were mascaraing as the ferris wheel the whole time. – Matt Sep 10 at 21:38
  • Depending on how thin the "skin" wall can be while maintaining structural integrity then the T1000 can potentially become very very hollow. I wouldn't even know where to begin to figure out the math on this. – MonkeyZeus Sep 11 at 13:08
  • @MonkeyZeus, thin enough to disguise itself as a floor without anyone noticing – Separatrix Sep 11 at 13:18
  • @Separatrix That's because the floor is supporting the entire weight of the metallic puddle. It would be interesting to know how much the T1000 could balloon itself in human shape before it collapses. – MonkeyZeus Sep 11 at 13:20
5

The out-of-universe answer is, of course, that the T-1000, as a villain, needs a face. The face of Robert Patrick, to be exact. It does take a different form on two occasions, but they're exceptions, and of short duration.
Once, the plot required it, obviously the T-1000 couldn't have killed and impersonated Janelle if it didn't look like her. The other occasion with the fat watchman walking over the checkerboard floor was just, well... CGI show off. Don't forget it's an early 90s movie. CGI was super expensive, super awesome, super... cool. Magic. People watched Star Trek TNG and Black or White only because of the CGI back then. Which, at that time, were not just "OK effects" but stuff nobody could even have imagined as being possible before.

You see the same thing (villain face) in "Matrix" where every agent is Mr. Smith (and the few that arent, at the few, selected occasions, are all Mr. Jones and Mr. Brown). Why do civilians who are taken over by agents need to look like Mr. Smith? Well because Neo getting beaten up by the cat lady, or by a stinking hobo in the subway tunnel isn't nearly as "chic". The hobo doesn't have the face of the villain.

In-universe, the T-1000 is a nigh-invincible war robot, but as we see in the movie, it's not bulletproof, nor indestructible. So, avoiding being shot upon first sight is certainly not against mission parameters.

Plus, it has the concrete assignment of killing one particular person. What's the single best approach to do that? Well... get near the person in the form of a normal, harmless human, and then... just kill her. Oh wait, it was the boy who was to be killed in that movie... never mind, all the same. Kill him.

Pulling off a "I am Megatron, Destroyer of Worlds, bow to me or die!" in the middle of L.A. neither helps avoiding trouble with local authorities, it also significantly reduces the likelihood of civilians being willing to help you find your mark, let alone your mark who knows about murderous robots from the future, staying where he is. Really, there exist better strategies for not alarming everybody and their mother than appearing as an obviously non-human killer robot.

1

This answer is only within scope of T1 and T2. It's also speculation, but logical. Skynet is afraid to damage the timeline. There is a reason it does not send 100 terminators all over the place. There is a reason it does not try to detonate a nuclear weapon in a city to kill the targets. Skynet is trying to make sure the future that happens is one where it's created.

This means stealth is the most important prerogative of the mission. If the humans figure out there are robots attacking from the future, all AI research would be suspended. Skynet would not exist.

Because of this both the t-800 and t-1000 do their best to remain human. Anyone that sees them as robots must be killed. Doing something crazy like turning into a horse in the middle of the highway violates this prime directive.

In the end, changing the timeline is Skynet's downfall.

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