While questing on my Fire, I was told to talk to Tu Luk Kwo. When his dialouge box pops us, it says his name is Tu Luk "WC-NPCS_0000778" Kwo. Nothing major, just a minor bug.
It didn't happen to me, and it isn't something special to fire, because i'm fire too. I understand the thing he said. He is Wizard City NPC (someone you talk to him, gives you quests, etc), and the number was the NPC ID, because everything got ID (creatures, NPCs, housing items, things like lamps, etc).