I'd love to add something to it, it's just that every time I think of something I find it's already there, and written with far greater authority than I could ever have mustered...
Think harder
Seriously, even if the character is already there, perhaps a story that you have is not covered, then you can add those details to the entry.
Heck, even if you have a nice picture of a character that doesn't have a picture, you could at least add that.
Anything would be welcome and that goes for everyone.