Well.... I don't want to disappoint you, but it is known that in the end there will be Polymorpher and Summoner, no Bard... sorry.
Then I think we need to look at where you will be able to use these skills. Only in combat or even in NPC/world interaction?
With NPC/world interaction you could maybe shapeshift into a undead so you could talk freely with other undead and so on.
In fight I think more local changes would be cool. For example you will shapeshift you legs into (claymore yoma legs - in case anyone knows claymore) so you could walk more distance with one point etecera...