Hard to believe it took me a couple of years to do this, but I finally wrote the blurbs for all my characters and sorted out my "cast" page so that reference and gift art are immediately accessible for each character: http://www.malaakonline.com/cast.html
I hope I didn't miss anything... The weird blanks are because I have more art to add that isn't formatted yet and I'm too sleepy now, so it'll be tomorrow... at some point... I have a live TV interview that's going to take up all my afternoon

I know some people go into real detail when it comes to their character descriptions, including likes, dislikes and every detail of their biography, but I find that's really unnecessary if it's not directly relevant to the plot. I prefer "show not tell", and keeping my options open for future plot developments. For instance I really don't know where Adrian comes from and where he got his training, but I'll only bring that up the day the plot requires this to be brought up – and then I won't be bound to anything pre-decided.
What's your own approach?

Mines is reveal it as it develops so this way people will read the page as a refresher or so new people can see it and want to read about said characters, also people grow because of the story so the Bio would change.

Yes, makes sense to keep it updated as the story advances. But are you worried about the spoiler potential then? Do you put a disclaimer for new readers to read the story first?

Mmmm... Not much spoiling going on if done right, you can only talk about the one character, you can add stuff in your comic you can say Malaak shoots energy beams outta her eyes, that is not a spoiler no one would notice it. Also in some cases spoilers are good builds interest and also its not the spoiler itself that tells the story its how it happen. My page has some spoilers in NG bio but far less then in my dA page and well it happens really. Does not seem to hurt anyway. Just depends what you put, but either way it will happen.

In my case there isn't much I can say about most of the characters past the basics. Too much of my story relies on unexpected twists

very true but as the story is told you get give them out but that be your choice, when I read comics I tend to look at archives and character Bios to see what is what and so on. But you do not have to tell secrets to show character growth.

Exactly why I mention a disclaimer: I'd want people to find out these things through the story, as they're meant to be given out, for their own sakes, otherwise the whole pleasure of discovering them is gone.

Well, even if you say something it is not the something itself that is the fun it's how they got their. Always remember that

Uh, yes, that's what I've been trying to say, although you make it sound like you mean the reverse So I don't really know what you meant just there! But my point remains: if you have a story building up to certain revelations, giving those away in the cast page without warning is a thoughtless spoiler on the author's part. Facts that are not introduced dramatically and/or that don't spoil the storyline don't matter, of course.

yes yes