Anyway! Learning about him as a -person- or professional (bounty hunter) etc wouldn't be too hard. Though knowing he was an Ishgardian isn't something really advertised though he's not really trying to hide it much either. I mean he doesn't really disguise his accent (if there is one) or at least a proper and 'noble' way of speaking. He'll make references to the North or his Northern upbringing. Feel free to scour the rumor mill a bit of course! The tattoo on his face would be a bigger giveaway to someone who was familiar with knightly orders and such in Ishgard, hence him fleeing to Thanalan after the 'incident'.
But yeah, we could make it work one way or the other pretty easily!