Son Goku: Speaks Chinese due to Saiyuki taking place in China, but also some Japanese. (Because the manga is Japanese and Minekura uses Japanese names for characters/places - ie, he's Son Goku, not Sun Wukong)

Nozdormu: Speaks all kinds of Azerothian languages (even dabbled in Nerglish), though his native tongue is Draconic. The Azerothian 'Common' is equivalent to English. (Plus he's got telepathic speaking =P)