When there is one, or no people fighting on multiplayer, those semi-invisible character models appear on-screen, there is something written on their heads, but I only got the screenshot of one side.
Hmm looked around for that but I couldn't find it. Fun fact: When there are two ghosts, you can see the tori ghost through the uke ghost, but you can't see the uke ghost through the tori ghost.
byonl could mean something in another language, or its just a word that has been cut off.