I saw a thread like this a couple days ago but it only got 2 replies, which is sad because something like this is super interesting to me in something like an MMO.

What did your character do before coming to their starting city state? Do they have a goal? Who were they before they became the Warrior of Light?

Here's mine, just as an example:
Negative Space, the last of his clan, came to Eorzea from the faraway land of [unidentified] to learn the coveted art of Sharlayan astrology in a futile bid to bring his kind back from the aethereal sea. Unfortunately he ended up being inadvertently scooped up by Hydaelyn, and though his original goal has since fallen by the wayside, he has decided that saving the star from the Empire and otherworldly forces was more important for the time being, since he can't bring his clan back if the star is gone or under the yoke of a tyrant. Since he has joined with the Scions, and has used their resources (unbeknownst to Tataru) to study his original goal, deciding to further pursue Sharlayan technology in his bid, between Alphinaud and Alisaie breathing down his neck to go murder something.

He has since gotten very tired of being shaken around like a chore-doing ragdoll, and fully intends to blow a hole through Zenos' head with a noulith and flip Hydaelyn the bird before going back to his homeland at the end of Endwalker... if he gets there.

'Negative Space' isn't his real name, as he doesn't want to be connected to his clan just in case the ones who wiped them out come to finish the job. He intends to keep this name until either his clan is recovered, or if he ever determines this to be impossible.
(Disclaimer: I did look for an RP/AAR subforum and didn't find it, so if there's somewhere else this should be then I apologize in advance)