draw all of my original characters in one single epic group shot

I've created dozens of characters over the years, each in their own little stories and worlds. They live on different pages and in different sketchbook. They've never met. It feels like having a bunch of friends who don't know each other. I want to bring my whole cast together. A huge challenge of scale and consistency. ALSO the idea is very ambitious. And I'm just too afraid to screw up haha