A Not So Easy or Quick Question: Characters

[Jack Darby]

The question I am about to ask is one that is too big for the Quick and Easy Questions thread. You see, I've had an idea that I'll be using for Veritas's replacement in about thirty days (give or take a few) but I want to make sure the idea would be feasibly sound, and well within the rules of the site. The idea is a character who will sort have the personalities/memories/minds of many characters from many different series/shows inside of his brain. I am not sure if such an idea would be allowed,  so I will pose the question now about the character idea. 

Would he be allowed?