Like how RuneScape has it when a player moderator speaks, there is a crown next to their name. Is this possible to incorporate into Minecraft, too? Possibly through GroupManager?
I saw a server once add special brackets and stars in front of the name. I don't think Crowns are part of that though
Well you can see all special characters here: http://www.w3schools.com/tags/ref_entities.asp Not all of them work in minecraft though.