Some special characters show as question marks in chat

[egguchan]

Some special characters in people's names are showing as ? rather than the actual character:

This is how the name should appear:

[codecat]

This is because the font used in Openplanet doesn't have every character. It has most from Arial Unicode, but some characters are super exotic and aren't included. I dunno what character this exactly is, though.

[ezio416]

To add on to this, some Korean characters: