Dancer Tank!!!

[Calypsx]

I just think tank would work best for the pure dance theme since it could be about dancing out of harms way or distracting foes with your movements.

You hit the nail on the head. Look how dancer is shown in FFXI in cutscenes.

https://youtu.be/3eg_Xz-OFyI?t=1m50s

Distracting foes with movement and dancing out of harms way is exactly what she does. Also Dancer in FFXI lore wise was specifically developed as a way to turn dancing into a weapon. Dancers were used as frontline fighters during the great war and it is not used primarily to bring comfort to allies like bard is.

The evasive combat dancer isn't that far fetched if that's what Dancers have been portrayed as in the series. They even have a tank stance in XI.