This doesn't look like a mix at all, it looks like pure UTF-16. But it does contain a bunch of \n
and \uXXXX
strings once it's decoded. Presumably you want to convert all of those to characters.
>>> print x.decode('utf-16').decode('unicode_escape')
"WantedCropped/13.jpg" "
蘑,-'此四郡咸瀉] 郡〝"同樹之吟[』赦〝連仙〝如五嶽〝Z蟲
Once you've converted the string to Unicode it's easy to convert to UTF-8:
>>> y = x.decode('utf-16').decode('unicode_escape')
>>> z = y.encode('utf-8')