Time Mage, Geomancer, Dark Knight, Templar, Berserker proposals

[Tzain]

I'm not too keen on Astrologist as a job, seeing that they seem to be fairly common in Ishgard, and jobs tend to be long-forgotten disciplines.

I name the design last. So I'm never tied to it. I decided to create something based around Thunderstorm procs rather than firestarter.

Plus, Paladins aren't long-forgotten, they're just rare because they didn't want Adventurers to join.

As for your Green Mage idea. The idea of stacking marks (sigils?) on a target could have some legs. Especially given a "stack and consume" mechanic. I actually think you'd be better off baking these into the Astrologist class and making it a pre-30 healer. Stack offense DOTs and consume for Burst, Stack Defensive Marks and Consume for Burst. Maybe a Consume for burst and also a consume for spreading? Like stacking Marks on the Tank and then move them from the Tank to all the rest of the group. Has a nice "Risk vs Reward" idea behind it and the timing works well with Cleric Stance (or something like it). Generally speaking though, don't use Max Range. It's just going to inflict pain on you. if you're spreading them around, make the healing range basically twice the range of Medica II if the point of spread is the tank, preferably though, base the spread range on yourself and match the range to Medica II.
Then at 30 you can split it into a DMG focused aspect and a Healer focused aspect, but both of the basics are all there in the class itself.

So the class might be 1-30 baseline dps/heals, 30-50 debuffs and utility. Then the Jobs take the heals and dps respectively and ramp them up?

All in all it feels a lot like how I played my Plant based healer in DCUO. I stacked the Regens and then consumed them for Burst healing. the difference there was, the regen was an aftereffect of the heal but given how FFXIV works, I don't think it's a problem.

EDIT: Oh, and for a weapon, how bout a sweet crystal ball? Bringing back the old school FF1!