Ever felt like, reading through that long wall of a description of a person still doesn't really help with your visual image? Ever wished that maybe, if they had a reference picture somewhere deep in the forums or maybe just on their PC, that you could see it at the tip of a command?
I have. So many times. I've even seen that in some MUD's where you can make a FILE for every character in the game, that you can add to about general knowledge most people would have of that person. Of course, that's optional. And more of a side-idea.. back to the point.
Imagine if I wrote something like 'show (characternamehere)' and it showed me a picture or a link that the player inserted. So there'd be a command to insert this too. It would obviously be an optional thing as not everyone wants to bother with that and some people use screenreaders.