Chell

Chell is the main protagonist of the Portal series. She is a test subject of the Aperture Science computer-aided enrichment center. She is a silent protagonist with a stubborn will to live, the latter being the reason she is still alive.

Not much is known about her past, but certain Easter eggs show that she is related to a scientist who works at Aperture.

She is hated by GLaDOS, who believes that Chell murdered her during the events of Portal. At the end of Portal 2, though, GLaDOS ultimately sets her free.