Raan Jaani of the Navis Nobilte house Mahdavi.
Mahdavi navigators are from a unique strain that is only manifests in females and always with the same mutations:
Blue to grey skin, a pair of extra arms and materium blindedness (they can only see the world as it is reflected by warp energy similar to a bat's sonar. thus they typically are acompanied at all times by a retinue of sanctioned psyker slaves who are blinded out of respect to the navigator's station.)
Among other eccentricities Madhavi navigators wear only head-coverings out of consideration to their ship-mates, in an attempt to emphasize the danger of their third eye.
One other item of note, it is a sacrilege for House Mahdavi navigator's to touch the ground. While this bit of legalism is widely interpreted it at the very least means from birth Mahdavi girls never touch the bare flesh of their heels against solid ground. While in some cases this means the Navigator is never without a human palanquin less dogmatic interpretation by some navigators means they merely put on full attire when planet side including especially thick soled boots.
And for any of you that like that kind of thing the first draft is here...