#of course the navy hood item description indicates there are other tarnished who saw grace while alive but perhaps its less common

[wraith-caller]

Fia is a Tarnished called to grace without having first experienced death, which may be something of a rarity. Melina tells us some of Marika's words across 2 different churches, the Third Church and the Church of Pilgrimage:

My Lord, and thy warriors. I divest each of thee of thy grace. With thine eyes dimmed, ye will be driven from the Lands Between. Ye will wage war in a land afar, where ye will live, and die.

Then, after thy death, I will give back what I once claimed. Return to the Lands Between, wage war, and brandish the Elden Ring. Grow strong in the face of death. Warriors of my lord. Lord Godfrey.

That indicates that Tarnished get their Grace back only after dying. The opening cinematic does a little to corroborate this. Hoarah Loux is impaled by arrows, the Dung Eater is being hung, and Gideon Ofnir is in his casket. Goldmask is a little more ambiguous, but given the others are dead, and the way he's sort of splayed out on the ground with his prayer book and other items in disarray around him, it seems like he could have fallen dead abruptly.

Fia is the only one that is unambiguously alive. She is sitting up, actively looking at the sight of Grace, and she tells us she was exiled from home for seeing it. So it's very interesting that she is very devoted to and at peace with death, when she may be one of the few Tarnished to never have died to begin with.