I would love to see Bard again but this time with the possibility to play musical instruments, playing 'notes' with keyboard. With this he could assign a customized song (few notes of course) on every ability/magic when he cast them.
And an idea about a possible Treasure Hunter (or Archeologist or Lore Master) class (gathering):
- To find ancient/lost things around the world (books, items and stuff, with specific text to learn lore of Eorzea too), and the possibility to put them in your house. With 'searching' sidequests for it (with riddles inside).
- One of the abilities could be the possibility to translate some different languages (beastmen) or 'understand/decipher' paintings and scriptures around the world or to learn things on an area/region if you explore totally it using that class.
- He could find ancient/rare devices or items useful for the crafting classes (with a mini-game possibly)
- Also he could have useful ability in combat, like studying mithological beasts and finding their weak points.