If you are given the choice to live in eorzea

[Zaniel]

You will become your character so you will be teleported to his last position but you will not be the main character, the main character will be the guy in the trailer the story will be at the point where you are and it will advance by itself

Are the NPCs actual real people now or just androids with an icon over their head? If real then:

Beachside house + servants, millions of gil, Echo + physical & mystical super powers + useful crafting skills, acclaim, super good looking and immortal? Plus I get to ditch all the world ending, soul cracking responsibilities of the WoL? Hell yes!!

Worst case scenario if I really need to I could become a side member of the Scions and become by FAR the most useful Trust member the actual WoL chooses to go on adventures.

[HanWenqing]

Are the NPCs actual real people now or just androids with an icon over their head? If real then:

Beachside house + servants, millions of gil, Echo + physical & mystical super powers + useful crafting skills, acclaim, super good looking and immortal? Plus I get to ditch all the world ending, soul cracking responsibilities of the WoL? Hell yes!!

Worst case scenario if I really need to I could become a side member of the Scions and become by FAR the most useful Trust member the actual WoL chooses to go on adventures.

The npc will be like real people, they will have a will but will be mortal unlike you.
You will be immortal as long as we don't kill you, same for your servants / mounts / pets who will be able to follow you in your adventures and will be loyal to you.

You will also be able to do things that are not in the game like storing items or weapons in your house by buying a chest.
You'll easily know what's in your inventory just by thinking about it and can pull out any item just by wishing it and it will appear in your hand
It will also be possible to build a huge castle, there will be no housing limit.

All your skills will also be usable just by thinking about it and it will be something innate for you if you are for example a level 90 white mage to use a higher healing magic.

you will be able to do all the dungeons or challenges or raids but all the content will be unsync there will be no more sync system same for the fates

You can level up to level 90 max

the only black point is that being immortal maybe it will be super fun to be in eorzea but I imagine after 100 years or 1000 years or 10 000 years or more you will be in a deep boredom and will end up doing a 90 raid in solo to finish it

If the game has an update, new content or a new expansion you will receive a letter from the dev team that you can read to keep you informed of the new content
If the game is dead and there is no content left then the world of eorzea will stay the same forever.

If I choose to become a Hrothgar will I be able to wear hats?

Yes you will even have a huge choice of haircuts