AIAnnotationDrawerSuite::DrawText() takes an ai::UnicodeString, but when you pass it non-Latin1 characters, you just get the box character. I suspect that if I passed Japanese to the Japanese version of Illustrator, the characters would display correctly, but it'd useful if you could do it regardless of Illustrator version.

We are just starting to add translations of our plugin and currently AI tool tooltips & annotation text have to be kept as Latin1 or we run into trouble.