Idle Animation.

[Valinis]

You know what ninja / rogue should have? That sitting-lean pose whilst tossing your dagger up and down. If you've ever been in Limsa's rogue guild you'll know the pose I mean exactly.

EDIT: Made a gif;

This would be amazing, but a little unfair to all the other classes (unless they all get some sort of unique pose).

[Lokier]

This would be amazing, but a little unfair to all the other classes (unless they all get some sort of unique pose).

Oh, of course. Like AST could be holding a deck of cards like they're playing poker, or if you sit at a table (I dunno how they'd implement it) you could look like you're doing a tarot reading. Paladin, or anyone with a sword / axe I suppose, could be shining their weapon. Ehm... SMN and SCH, whilst sitting, could have an ability to summon their carb' which will appear and disappear around them on the seat, at their feet, etc...
Bard whilst sitting could be strumming their bow, maybe it plays a little jingle? Nothing too irritating tho, or the sound of them spamming it would get tedious, lol.