Forb-T:TheOneBlueGecko:Oh I will...eventually, it is just such a task starting out because it is so hard to decide what to say.
Just found myself in pretty much the same predicament. I've been wanting to update/redo my cast page for a while now, get some new images of the characters and rewrite their descriptions. And when I went to write the new bios out the other day...I was at a loss of words.
But, I managed to finished the bios for the main three characters today. Now I just have to get their images up.
When it comes down to it, the characters are the center of the story, and if you're like me, you know your characters so well that they might as well be real people. And when you know everything about them, when you know them as if they're family, when you know their history from start to finish, what they've done and what they're planning to do...it's understandably difficult to come up with just a few sentences to describe them.
I've had some experience, though. Not sure if this will help, but...
There are two ways (not mutually exclusive) that I've found can help you can describe your characters.
The first way is that you describe your characters as you'd try describing a good friend of yours to someone who knows nothing about the good friend. You try to tell them the important stuff, but they won't appreciate what's been said until they meet the person. After which they'll make their own conclusions based off of what they see--and if you've done your job, they'll agree completely (or close enough to completely).
The second (similar) way is that you try to capture what's most important about the characters, who they are at their core, and build the description around that. Have an image which shows them in their most natural state if possible, maybe throw in a quote by/about them which is incredibly appropriate...you get the idea. Capture what really matters about them, and leave the finer details to the comic.
Both are good exercises to do regardless, anyway, since it can help you know your characters better. (Another of the classics being holding a conversation with your characters--it's surprising what you can learn when you listen.)