Just musing out loud.
I don't have one theorycrafted or anything, but suffice it to say by melee I of course don't mean the actual healing part of its skillset (or... do I?), I'm imagining it just being its damage-dealing abilities. I think it could make for a novel addition to the game's roster even then.
What brought this about was my pondering the kind of Job they might give Gaia in the future since although she's a MRD/WAR in terms of (roughly) weapon type and stance, nothing else about it matches her particular skillset. Making her a Tank still doesn't feel right (even if a time skip were involved), and then it struck me! A melee Healer that uses time magic to halt or rewind damage! After all, there's a strong connection between maces/hammers and clerics and the like (admittedly mostly in western media e.g. Warhammer Fantasy), and aligning it with Darkness would make for a fun twist, I think.
Damn it, I really want this now...