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The 'wisp' looked similar to the soul collector spirits from InuYasha -at least in overall form. That design is fairly unique to that anime though, so I doubt it is exactly along those lines, but they may be inspired by the concept of some kind of 'spirit entity'.
But that in itself seems out of place given what we know of the last few episodes. I guess it could be part of more interaction with the spirit realm - maybe even another reunion with ghost Splinter.
As for Donnie's 'younger' design - it may just be he hasn't changed much - after all this is a very basic rough sketch and far from a finished product.
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