Saskia Blake does not look like what she is.

She is small, delicate, and quiet, at least on the outside.  Those who know her will also testify to the fact that she can be more than a little shy around strangers.  Talking to her gives the impression that she seems to like machinery far more than she likes most people.  Which is okay, because machinery seems to like her too, perhaps because she almost always speaks kindly to it (unless it's been a "BAD machine", in which case it will be severely reprimanded).

When seen outside her own workplace, Saskia is often hunched down into outsize coveralls, which completely hide whatever shape she might have.  She wears spectacles, even though Retinoxinase™ treatments would correct any visual problems she might have.  Maybe the lenses are more to hide behind, than to improve her visual accuity.  Mousy brown hair is pulled back into a loose tail, which somehow manages to make her look even smaller.

The overall impression her appearance gives is of a nobody.

Sometimes though, the mask slips.