I don't know about the entirety of Unicode characters, but I've been using Audacious since version ~3.1 in 2011 (now 3.4.3) and it's never had any problems displaying Japanese and Korean characters--if you're not using the Winamp 2 theme with bitmapped fonts.
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I don't know about the entirety of Unicode characters, but I've been using Audacious since version ~3.1 in 2011 (now 3.4.3) and it's never had any problems displaying Japanese and Korean characters--if you're not using the Winamp 2 theme with bitmapped fonts.