phoenix is eu, right? not sure what eu reset does for their fc there. i'm on na side but in the old old gaf 1.0 fc so i can't help you there.
also if you mean the purple guy in the shadowbringers image, yep that's supposed to be the protagonist. they put him in there for the cg trailers since 1.0 to sub in for your character. he changes jobs every expansion too lol
if you mean the guy in the top top banner in the hood, that's a shadowbringers story character.
as far as glamour...it's just changing your gear to look like another piece of gear. you can change individual items by right clicking them, selecting "cast glamour" and picking the item you have in your inventory you want it to look like. it costs 1 glamour prism (can be bought with company seals or made by any crafter and buyable on the market board)
the other option is storing gear in your glamour dresser in the inn room, then you can use them in many outfits (called glamour plates in ff) and only have to pay 1 glamour prism to store each item. you can hold 400 pieces of gear in the glamour dresser, which is less that it sounds like once you level a bunch of jobs!
here's a guide that should break it down pretty well...
Most of the time, when I get a request from Patrons, I’m asked to put together a new glamour, but returning player and Patron Helena wanted to see a breakdown of how glamour works in the game…
fashionninjutsu.com