The class least likely to be added?

[hynaku]

Mime I think is least likely to ever be added since only has one skill mimic.

[Kazrah]

So because I'm bored, I'm gonna break down most of the jobs I've seen so far in this thread:

Onion Knight....I could honestly see this as a Limited Job designed around a "make your own job" theme that could be an interesting PvP thing.

Mime, when you think about it as a baseline concept, is just Blue Mage without anything that makes Blue Mage fun and/or interesting. If you do not find Blue Mage fun and/or interesting, also yes.

Berserker we already have. It's called Warrior.

Necromancer, in terms of game lore, is oddly just a Black Mage on steroids. While it's possible to have something like a Necromancer in FFXIV, it likely wouldn't look like what we would consider to fit a western description of one, spawning something like ghosts or spirits out of the nether rather than corpses out of the ground due to both censorship concerns and the aforementioned game lore. It might even be renamed to something like Reaper or Druid--I mean seriously, have you seen the stuff RL druids did in the past? Holy crap.

Arithmetician we sorta have in the form of Scholar and the base class Arcanist to a degree. Unfortunately, devs learned the hard way during ARR via the original Lustrate ability that anything percentage-based is actually quite terrible to implement, being incredible at the start and then staggeringly subpar as gear levels go up.

Viking, surprisingly enough, can still be implemented. In addition to Viking being a bit like Warrior, it also came with some Rogue-like abilities along with Tsunami and an assortment of Thunder spells. If Viking were to instead focus more toward the magical aspect rather than being the usual brute with spells like how Dark Knight is now, then it could definitely happen in the game.

Chemist may not be released as the salve-maker throwing vials at people's faces, but it'll happen. As long as people won't shut up about it, Chemist will happen via some sort of variant (hopefully as something like Cannoneer from FFTA2).

Plumber....maybe the reconstruction of Ishgard will finally bring in some much-needed toilets. Maybe it'll involve educating the nobles not to try and flush their lowborn.

Time Mage is a curious possibility now that Astrologian has been stripped of most of its time-based abilities. It also wouldn't be the first Square-Enix game to have both Time Mage and Astrologian in the same game.

Geomancer, Beastmaster and Puppetmaster I think could happen, but not like anything we've seen before out of those jobs. They would also join the ranks of Blue Mage and Eureka among the list of reasons why diehard FFXI fans need to stop suggesting things for this game because for the love of the Twelve, this is not Vana'diel and please stop ruining this game because IT'S NOT YOUR PRECIOUS CHILDHOOD GAME DEREN--er, whoops....

[Jkap_Goat]

I would like Geomancer

Sage could be a limited healer job

[Kallistra]

I am so sad to see Necromancer in here, lol.

I will continue to dream, damnit.

[Cidel]

Anything pet-related (Beastmaster/Puppetmaster) seems wholly unlikely outside of them doubling down on the concept of limited jobs despite the big backlash.

This would likely extend to Necromancer, not helped by the fact that a lot of quests and sidequests that deal with Necromancy and the like are either highlighted with disdain, tragedy, or both. Its almost like their universal "kids, don't do drugs" message peppered throughout the game.

Timemage seemed to have been reimagined into Astrologian with a dash of Gambler mixed in. Unfortunately they have cut/changed a couple of abilities that had a space/time theme, so the similarities between them are sparser. However FFXIV just doesn't seem to be fit for a job that's been known to: really only work in turn-based situations (and not concerned about "balance" when it's not), be mostly represented as pure support, its identity is mostly defined by 2-3 spells (which were given to other jobs in games like XI) and such spell effects are present in one form or another in XIV already. On their own, a lot of these aspects don't automatically disqualify the job from happening, but together they don't present a positive outlook.

[Crushnight]

Or they could use a design that is okay for all regions?

Necro is part of the name >_> tell me how they could design it where there would be nothing associated with the dead because any perversion or desecration of the dead is a huge taboo to their culture, their version does not have skeletons and zombies for this reason. I highly doubt SE would bother designing 2 sets of animations for 1 job that is more work than necessary compared to other options like a single job that is fine in every region.

[TheGrimace]

Freelancer. One job able to use the abilities of all jobs would be so powerful in an online game. Too powerful. One job to rule them all.

[Brandedblade]

Corsair. MCH covers the guns and AST covers the "gambling buffs" mechanic.