List of minor Aperture Science employees and related people
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 Test Subjects
 Portal 2: Lab Rat list
 S.J. Nye
His/her Test Subject number was #1 until Rattmann moved Chell from #1498 to #1, changing Nye's number to #2.
 Lazarus Grey
His Test Subject number was #2 until Rattmann moved Chell from #1498 to #1, changing Grey's number to #3.
 Leve Rage / Raged
His/her Test Subject number was #3 until Rattmann moved Chell from #1498 to #1, changing Rage's number to #4.
 Robert C. Knoll
His Test Subject number was #4 until Rattmann moved Chell from #1498 to #1, changing Knoll's number to #5.
 Charles Cardoze
His Test Subject number was #1489 until Rattmann moved Chell from #1498 to #1, changing Cardoze's number to #1490.
 Phil Konig
His Test Subject number was #1490 until Rattmann moved Chell from #1498 to #1, changing Konig's number to #1491.
 Christopher M. Pham
His Test Subject number was #1491 until Rattmann moved Chell from #1498 to #1, changing Pham's number to #1492.
His Test Subject number was #1492 until Rattmann moved Chell from #1498 to #1, changing Navarro's number to #1493.
 William D. Kent
His Test Subject number was #1493 until Rattmann moved Chell from #1498 to #1, changing Kent's number to #1494.
 Al Anderson
His Test Subject number was #1494 until Rattmann moved Chell from #1498 to #1, changing Anderson's number to #1495.
 Emily Naransky
Her Test Subject number was #1495 until Rattmann moved Chell from #1498 to #1, changing Naransky's number to #1496.
 David C. Self
His Test Subject number was #1496 until Rattmann moved Chell from #1498 to #1, changing Self's number to #1497.
 Doug Hopper
His Test Subject number was #1497 until Rattmann moved Chell from #1498 to #1, changing Hopper's number to #1498. Chell was listed right after him.
 Marc Meaux
Meaux's Test Subject number was #1499.
 Brenda Bogenschutz
Bogenschutz's Test Subject number was #1500.
 James Murray
Murray's Test Subject number was #1501.
 Extended Relaxation Annex
When ATLAS and P-body open the Extended Relaxation Annex for GLaDOS, hundreds of Test Subjects in long-term relaxation are discovered, as seen in the outro video of Portal 2’s co-op mode. Each Test Subject has their name on their Stasis Chamber, two of which able to be glimpsed. All Test Subjects are killed off by GLaDOS accidentally after she underestimated their fragility while attempting to transform them into killing machines.
 John Applegate
Applegate is the first to been identified.
 L.D. Turner
Turner is the second to been identified.
 Test Subject #042
Test Subject #042 is featured on a clipboard found in the Enrichment Center in Portal. It appears to be a chicken that failed the tests it took. It is unknown if these tests involved the Aperture Science Handheld Portal Device, as they are never mentioned elsewhere, and no dead chicken(s) can be found across the Enrichment Center. Finding the clipboard in Portal: Still Alive will unlock the "Tests Like Chicken" Achievement. The clipboard is seen again in Portal 2 near an incinerator in the Turret Manufacturing.
 Test Subject #234
Test Subject #234 is featured on a clipboard that can be found in the Enrichment Center in Portal, as well as near the Emergency Intelligence Incinerator within the facility turret production lines. #234 apparently passed the tests he/she took.
It was previously speculated that Chell might be Test Subject 234, since "234" is featured on the bed in her Relaxation Vault, but this was disproved in Portal 2: Lab Rat, which states that Chell was Test Subject #1498 until Doug Rattmann changed her to Test Subject #1.
Aperture Science ad, showing "a clear picture of the future" with "tomorrow" and "Aperture" misspelled and featuring chickens, revealed during the PotatoFoolsDay ARG.
Two clipboards in an office, one about Test Subject #234, the other about the Advanced Knee Replacement.
"Test Subject #234" seen on the stasis bed in the Relaxation Vault at the start of Portal.
 Other personnel
 Janitor Bob
This character is not canon: When the Portal 2 development team had to come up with old-looking versions for all the important gameplay props, such as button panels, doors, cubes - basically everything the player could interact with in Test Shaft 09, they came up with the fictional character of "Janitor Bob". Without any scientific knowledge, he would be responsible for maintaining the old parts of the Enrichment Center, fixing everything with duct tape, a screwdriver, and everything he could get his hands on, resulting in something not particularly aesthetic, but at least that still works. Whenever the developers got stuck designing props for the Portal 2 chapter The Fall, they would ask themselves: "Well, how would Bob build it?".
Jerry is a nanobot (and is consequently unseen by the player) who temporarily employs Wheatley to help him and the rest of his nanobot work crew rebuild parts of the Enrichment Center. It is not known what he looks like due to his microscopic size, but his presence is indicated by a garbled, sped-up, vaguely mechanical voice. He apparently gets angry at Wheatley for knocking a girder out of position as he follows the lift that Chell is riding, and fires him. Wheatley then claims that he has a prejudiced work site.
When reversing and slowing down Jerry's voice, one will hear garbled, cryptic messages seeming to involve scheduled testing on Tuesday.
Karla, nicknamed "the complainer", is a minor employee, featured on a poster in Test Shaft 09. She is displeased by the fact that her new boss is a robot.
 "Bring your Daughter to Work Day" girls
When Chell visits the Employee Daycare Center on her way to the Neurotoxin Generator with Wheatley during Portal 2’s chapter The Escape, she comes across the remains of a "Bring Your Daughter to Work Day" science fair during which several experiments were showcased by employees' daughters (including herself), mostly on potato batteries. The list follows the in-game order.
Jessica experimented on providing power to a small calculator with three potatoes.
Beth experimented on providing power to a light bulb with one potato that went flat.
Alix experimented on providing power to a clock radio with one potato.
Laura compared power provided by a potato and a lemon.
Heather is the only one who did not make a potato battery but a "baking soda volcano" instead, with baking soda and vinegar (an actual experiment), to see if a baking soda volcano is as cool as a real one (she concludes it is not, the bright side being it cannot burn people). Wheatley comments: "Baking Soda Volcano. Well, at least it's not a potato battery, I'll give it that. Still not terrifically original, though. Not exactly primary research, even within the child sciences. I'm guessing this wasn't one of the scientist's children. I don't want to be snobby, but let's be honest: It's got manual laborer written all over it. I'm not saying they're not as good as the professionals. They're just a lot dumber."
Katharine experimented on providing power to some sort of hard disk drive with one potato.