User blog:ZeroPath/Unborn Characters

I've been considering making pages for some of my characters who have yet to be born, but I'm not so sure if I should do it. Spoilers are one thing, but most of my concern is centered around the fact that the character doesn't actually exist yet outside of my head.

What do you guys think? Should I go for it? And if yes, should I pull information from their futures, or just use what they'd have on birth/what they might theoretically have?