Garlean Third Eye Customization option

[Absimiliard]

To be fair, all of these are lore tidbits which aren't really made a big deal out of in the game itself, like no one ever questions why Erenville or G'raha Tia would be in Sharlayan.
By contrast every time a supporting character turns out to be a Garlean like Cid or Lucia it's always presented as a big reveal and they're treated differently for it by the game's writing as well as in their interactions with the Empire so the transition might not be as seamless for player characters. After all there's more than a handful of voiced lines where you're referred to as an Eorzean by imperials.

There are other Garlean expatriates in Eorzea. Take Kan-E-Senna's personal guard, for example. One of them is Garlean pureblood. His heritage does not change the fact his current nationality is Gridanian, which makes him an Eorzean. Regardless of race, fighting on behalf of Eorzea is more than enough reason for imperialists or just about anyone else to refer to you as an Eorzean.