Board Thread:Roleplay Ideas/@comment-26444332-20161029194443/@comment-26444332-20161029214635

If they were an ancient hero, legendary in the past like Oda Nobunaga, or even half-mythical like Arthur, they can be used. I also opened it up to well-known custom characters whom you are known for using often: You can't use someone no-one's ever heard of, that defeats the point. They can be obscured to make them look like different people (take my own character template for a prime example)  but they cannot be unknown.

So to answer your question, yes.