"Learn from yesterday, live for today, hope for tomorrow."

I have this stupid story idea running around in my head about this secret society that protects humans from the baddies of the world by giving people who are dying a second chance at life by recruiting them. I have my main characters and a general idea for a baddie but I cant find any good character bases and it's driving me nuts! Especially when I don't want my main character to be a skinny size zero! X(
Why are there no like normal sized actresses and models out there that are in their twenties and aren't Kardashians?