I'm reading "On the steel breeze" by Alistar Reynolds. For a character named Travertine, he uses "ve" instead of "he" and "vis" instead of "his". This is a passage using "ve":
Travertine's a pretty divisive figure. Ve's a friend of mine... When ve was last in trouble..."
and this is using "vis"
Travertine examined vis fingers.
Is this some kind of formal treatment? or the writer made it up? I can't find any info about this.