I think if I *did* create some new class or classes, I would totally scrap the job progression system on them. I've never liked the whole job 1, 2 and 3 system tbh - I don't see the point of it at all. I guess it was fine when there were just 2 jobs for each class, but trying to come up with new ideas and skills that fit the playstyle of the original job without just making stronger versions of the original skills is really difficult. Some of the 3rd jobs are way off from what the original class was, like Myrmidon for example, because there is only so much you can do before things start getting rehashed. I expect this is the main reason the original developers of the game didn't bother to create the 3rd jobs. It's also extremely difficult trying to keep some form of balance with so many skills on each class - close to impossible really. I know there are quite a few games that use this system but I don't recall ever seeing one that has so many skills in each job - it's usually much less.

Anyway, there are some considerations to take into account when creating a new class
1. Armor
Most armor only has models and textures for 2 races. Most cloth armor doesn't have a model/texture for Hybrids, most mail armor doesn't have a model/texture for Humans and most plate doesn't have a model/texture for Elves. There are some exceptions on some of the older armors, but not for most of the newer more fancy stuff.

Because of this it wouldn't really be possible to create something like an elven paladin because there aren't plate models for elves, and no point making any kind of cloth wearing hybrid etc.

2. Weapons
Not a major problem, but some races don't have many animations for certain weapon types - meaning skills would all look very similar for some of them. It can be worked around by adding some nice visual effects but it might get a bit repetitive looking. This is another reason I wouldn't give any new class 3 jobs - it would be be just 1 or 2 max.

3. Existing content
Creating a new class would mean creating a version of all existing armor sets and weapons unless the class was built in a way that it could use the same armor and stat builds as some other existing class. A *lot* of work in itself.

Because of this, if I were to introduce new classes, I would probably do something a bit different and make it so you can't make a level 1 new character of this new class, and instead have it as a max level, or at least high level class that you could only switch to from another existing class. For example, you would need to level some other class to 65 or something and then you could do an epic quest to class swap it to this new class. Reminds me of the system in World of Warcraft for the Deathknight class - you had to have another character at level 55 or something before you could create one and it started at 55 instead of level 1.

This would mean a lot less work since I would only need to make armor sets and weapon equivalents for high level items.

Anyway there is a lot more to consider, but those are the main things that come to mind right now. New classes are always on my mind but right now I have so many Iris projects going on at the same time I wouldn't even consider making a new class. Maybe it's something to look at once pets are done.