I made a portal core! What do you think?
Personality Cores are typically stored within a case equipped with two handles, above and under, which fits around the Core itself. They have a large, single "eye", which glows in a color related to its function, a pupil varying in size, and a varying number of dots at each side of the eye. The Core can rotate in all directions within its case, allowing it to see in every direction not hidden by the case. In the back of the Core, a three-pin plug to connect it to computer terminals can typically be found.
Personality Cores are very solid and robust devices, as they are unaffected by long falls, and can withstand moderate trauma (such as being partially crushed by a robotic clamp).
In Portal 2, Wheatley states that a Personality Core is never to disengage itself from its ceiling rail, as doing so would supposedly result in the termination of the core, though he later disproves the point himself as he survives even after being detached. Contrary to popular belief, a detached core can move. A detached core moves very slowly and tediously, rotating its exterior shell and handlebars.
All cores appear to have an extremely long battery life. The Aperture Science Apocalypse announcements indicate that in the event of the collapse of society, Personality constructs are designed to function on power sources as low as 1.1 volts for protracted periods of time.
As demonstrated by Wheatley, a Personality Core is also equipped with a flashlight function, seemingly for use if the Core ends up in a low-light environment. Wheatley claims that he was told not to turn on the flashlight which would destroy the construct, though this never occurs as he remains alive and well when he activates it.
When Chell detaches all of GLaDOS' Cores in Portal, the Cores are flung to different locations once GLaDOS is hit with a rocket. Despite no longer being physically attached to GLaDOS, they appear to be still linked to her somehow by a greenish, semi-transparent beam. It is only when grabbed by Chell and destroyed in the Emergency Intelligence Incinerator that their effect on GLaDOS stops (In Portal 2, the Personality Cores only affect Wheatley when attached to him). GLaDOS is also equipped with four discs and four servers installed in the entrance of her chamber. The Orange Box Prima Guide states that these four discs "represent each aspect" of her Personality Cores, but it is unknown what that means exactly.
Cores are not foolproof and can become corrupted. Using these corrupt cores to control another will also corrupt that core in the process. Several of these corrupted cores were seen in Portal 2:
The "Space Core," a yellow core with a rapidly dilating pupil who speaks enthusiastically and disjointedly about space;
The "Adventure Core" (who also claims his name is "Rick"), a green core with a cat-like pupil and highly macho personality who attempts to flirt with Chell; and
The "Fact Core," a pink core with a large round pupil who spews random (and often inaccurate) trivia while also claiming to be superior to the other two corrupted cores.
Wheatley himself had already become partly corrupted prior to his fight with Chell. The Space Core puts him on 50% corruption, the Adventure Core on 75% and the Fact Core on 100%, effectively preventing him from doing any further actions without being shut down fully in the process.
All cores appear to have a built-in failsafe that prevents them from telling the Test Subjects how to solve a test when they attempt to do so, they receive a jolt of pain as GLaDOS partly explained and Wheatley demonstrated in one test chamber.
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