Idea for a New Healer: Songstress (FFX-2)
Now that Dancer is out (sort of) and since it's not a healer I figured I'd offer up an idea for a potential healer in the future.
Normally I'd say Chemist because, let's face it, we've all wanted to chuck items at our party member's heads at some point, but I really can't see a way to utilize it effectively.
Enter the Songstress from Final Fantasy X-2. It's already a buff/debuff class so I would imagine that slapping on a healing utility wouldn't be too far out of range. The only problem I could see is what their attacks would be. Maybe they could attack with soundwaves or (on a less serious note) they could have a bodyguard as something like a pet to fight for them.
We've already got Bards to play music and Dancers to bring the music to life, so let's get some vocals in here to give the music some emotion.