Looking at the page source for this current page there's a meta tag with content="text/html; charset=UTF-8" (I didn't copy the full line because of the self-modifying feature of the edit box...  ;o) ), so the page itself should be able to contain Kanji, etc.

But how/whether you can get non-standard Unicode into your post via the edit box is another matter entirely!

This is just a little test based on how posts self-modify after edits. I've typed in seven characters - ampersand, hash, lowercase-x, four, lowercase-e, five, zero. Let's see what happens:

&#x4e50

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident. And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU or something else.
*soon only to be available in two flavours -  DAZ and Renderosity