Okay, okay, the thing with G'raha is: Concealment is not just a core part of his character. It's a core part of his culture. His tribe has been hiding Allagan secrets for five thousand years. And then the Darnus family moved in and they had to amp that secrecy up to 11.
He gets sent to Sharlayan as a child in order to hide who and what he really is. Even though his own family don't fully understand what secret they're keeping.
So, yes, for him pretending to be a bold adventurer or a wise exarch is kind of like breathing. Don't let anyone know the true you has been drilled into him since birth.
Of course he's fucking terrified of being himself after Shadowbringers.
Also, everyone on the Source knows him as the Evil Voice that ripped the Scions' souls out. Why would he not be nervous all the time?
You see him start to relax more and more as he actually admits the truth to people. The first thing he does is put his absolutely forbidden Allagan knowledge and royal blood to use! Publicly! To devise the tempering cure! And even over the course of that one plot, you can see him settling into his own skin. When Master Matoya waves away his apology for the botched summonings is kind of the final moment where he really seems to decide, Okay, I can actually be G'raha Tia, whoever that is.
