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Chell
Chell, documented as Test Subject #234, is the silent protagonist of Portal and the single-player campaign of Portal 2; she is a former Aperture Science Test Subject. Her predecessor is Mel. Although Chell's origins are unknown, she was definitely among the people present during GLaDOS' activation in 200-, as GLaDOS locked down the facility immediately afterward; information revealed in Portal 2 implies that Chell was the child of an Aperture scientist because one of the "Bring Your...