Can I create profiles for those who don't want to get involved?
No, that would be illegal. But administrating an account with their approval is possible.
To do so, send them an invitation to join and request that they give you admin access (from their Profile page). Then you can edit their profile and create stories about them.
Even if someone doesn't have a profile, you can still include them in your stories. You just won't be able to assign stories to their profile or search for their stories in the usual way.