Despite the protagonist of Portal, Chell, being seldom seen by the player, she quickly became a fan favourite. For the most part, Chell is your only human connection as you journey through the elaborate and treacherous tests that GLaDOS sets up for you; no wonder we all get attached.
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Though we all love Chell, we don't actually know very much about her. One closely guarded secret is her parentage, and the most popular fan theory about it speculates that Chell's parents may have worked at Aperture. What proof is there? That's what we're here to explain.
Very little is known about Chell's backstory. The game doesn't give us any information - she's just thrown into the tests after waking up in the Aperture Science facility. In any place it would normally appear, her surname is listed as [Redacted].
We do know a little more, assuming you're comfortable trusting GLaDOS. She says that Chell was abandoned at birth on multiple occasions. She also says mentions that Chell was adopted. Finally, there's one moment where GLaDOS mentions that two people with the same surname as Chell are in cryogenic stasis. If her previous statements were true, these two people would presumably be Chell's adopted parents.
The theory that Chell is the daughter of two aperture scientists existed for a long time, but really took off after the release of Portal 2.
The key evidence was that, while exploring old parts of the Aperture Science Enrichment Center, you can discover a forgotten 'Take Your Daughter To Work Day' event, with various science projects made by the daughters of Aperture Scientists. One of the boards includes the note "By: Chell" (see above). S
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