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And on top of that,
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Plus, my headcanon Gaster and Cave Johnson would get along well because they're both scientists, and...
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There's also the thing about cake and pie. Except, I guess, the cake is a lie and the pie is not.
GLADoS is yellow (well. Her eye/optic thing is yellow.) and never acts based on emotion. She tends to be pretty sadistic, and has a thing for turrets and deadly neurotoxin. Flowey doesn't have emotions, and kills everyone. GLADoS is Caroline, and Flowey is Asriel.
On top of that, Chell is supposed to have not been accepted as a volunteer because she had an extraordinarily high tenacity- which you can more or less use interchangeably with determination.
Then there's the whole Rattman thing. You never see him in-game, only mysterious hidden dens, paintings on walls, and a few spots where you can hear what might be his voice. So no one really knows who he is/was- just like the Man Who Speaks in Hands.