Let me begin by saying I am not too familiar with abilities/spells present in other FF titles. That said, there are some abilities I'd love to see get upgraded come 7.0. This is primarily a visual upgrades thread (higher potency with a new animation), but if you have ideas for how a skill can be otherwise upgraded, more power to you!
Black Mage
I think it's time Black Mage gets an upgrade to Flare. We've had it since level 50 and honestly I'm not crazy about the animation anyway. Just a potency boost and new animation. Or just an animation upgrade, that's fine by me.
Red Mage
While the balancing between black and white mana is fun, I think Fleche and Contre Sixte add some nice spellblade-vibes to the job. It'd be cool if these were upgraded to be flashier or expanded on to even include their own combos.
Bard
Really what I want from Bard is a further push into music/notes as it's design. The DoTs don't mean as much for them anyway anymore and people have been asking for a proper Ranger job. Personally I'd like Bard to just fully embrace music-themed attacks outside of their songs. Oh and for the love of god change Rain of Death. It's so ugly.