Story said:
Just out of couristy though does Chell not have personality because she's viewed through a first person perspective? Aren't the actions taken by the player part of her personality?
I don't want to derail the thread even farther, I think I'll just make a new topic on the subject when I have the chance.
I think the first person perspective is part of it; it removes body language, which is mostly what characterises Amaterasu so well.
The actions undertaken by the player... Sometimes they can characterise. I wouldn't go so far as to say Chell doesn't have a personality at all; just that her personality isn't very well developed, because we only have a few little windows into it.
Ooh! I've thought of a particularly good example. The actions undertaken by the player can be great characterisation, I would say, when they're particularly mould-breaking. Chell escaping Aperture Science indicates a great resilience, but the same could be said of most video game heroes, silent or otherwise. It doesn't really indicate anything noteworthy in the context of video game protagonists. On the other hand, look at Daniel from Amnesia. At one point, Daniel must fill a large stone container with water to solve a puzzle, but the muffled noises from inside seem to indicate that something- or someone- is inside, and will drown if you do. There is no other way to progress, however.
That, I would say, sets Daniel apart. The player was in control, but It is part of his story that he filled that tank, and that differentiates him quite starkly.
I'm not sure whether I'm making my point very well...
EDIT: I forgot Grace Holloway, of Bioshock 2, and Brigid Tenenbaum from Bioshock 1 and 2. Those games have great all-round casts of characters, but those two are particularly complex and well-thought.