One giveaway that most people didn't catch but only very few people have (I've mentioned it very early in this forum a few thousand pages back). Onyxdime is British, you can tell in his writing he uses a lot of colloquialisms and British specific phrases, words and mannerisms. There was some obvious giveaways in the Caroline update and some less subtle lines in Sara's update.
For the most part we've come to the conclusion that ICSTOR is American (some suspected Eastern Europe but he gets taxed US $$$).
I will go further and say Onyx is from the South of England (South East London perhaps?). I was gonna guess Midlands/Yorkshire but you writing gives off South England vibes, am I close
Onyxdime?
EDIT:
Just checked your Patreon which charges in GBP (£) so I guess that much is true lol