Nature oriented job?

[ADVSS]

I agree regarding WHM. While the lore and quests are heavily focused on keeping harmony with the elementals and the Twelveswood, if you look through the ability list, most I would say are unthemed (Cure, Medica, Regen, Presence of Mind) or have an ecclesiastical theme (Holy, Benediction, Assize, Tetragrammaton, Divine Benison, Plenary Indulgence). You could maybe say Stone & Aero are nature-based, but they're also just simple offensive expressions of the earth and wind elements. Even the AF set names (Healer's, Cleric's, Orison, Seventh Heaven) imply the job is more of a cleric than a druid.

If they ever figure out a way to make Geomancer a full job rather than how it's presented in the AST quests as "the other side of the same coin as AST", then I imagine that might give you what you want.

There is a reason for this: besides creating new lore, final fantasy games usually and consistently use many similar ability names from previous titles. WHM has been around since the first final fantasy.
I agree though if youre going with pure lore and something new, maybe if we get to the new world there might be a brand new lore related job like a shaman or shapeshifter. I would be okay with that.
As far as a morpher of any kind goes as far as im aware the only thing close to would be Terra Branford using "morph" to become half esper in ff6. All it seemed to do is enhance some stats temporarily{? never used it much}