I did a search for 'font' throughout the .java files and found Verdana, Arial, and Helvetica. Also, the chat windows seem to use Times New Roman, perhaps a default? I think picking one or two bit-like typefaces to do all the work would help stylize the overall feel of the game.

http://www.dsg4.com/04/extra/bitmap/

Although, them fonts might not include special characters. But I'm sure there are bit type fonts somewhere that do cover the extended alhabits. Regardless, even if we picked Helvetica, I think a dominant typeface should be chosen! xP