One thing that I think the murderbot community has tragically overlooked is that Gurathin canonically has a unibrow.
Fugitive Telemetry, Chapter Four, page 56: “…Gurathin asked, his big brow creased.”
"Brow" is also a word used in some contexts to denote the entire forehead or brow ridge area (e.g. in Lord of the Rings, "a star upon his brow," meaning a gem set in a circlet positioned on the forehead)- and is especially used as such in fantasy, a genre Martha Wells has written extensively in. In this context, it can be interpreted as referring to a prominent brow ridge, which Gurathin has furrowed in a frown.
That said, I fully accept the unibrow headcanon into my heart. There is no better feature to suit this bespectacled nerd human. I look to our fanartists to rectify the tragic lack of Unibrowed Gurathin representation.
when the people are right, they're right.