I haven't heard anything about them having theme park characters at various locations in the park yet.  But, I am sure they will as many theme parks do.  It would be great to be at the park and to encounter Mad Eye Moody, or Rubeus Hagrid walking about, or even Harry Potter himself.  I would love to get some pictures of Mad Eye Moody and myself.

Mad Eye Moody, for which I was skeptical with him at first, has turned out to be one of my more favorite characters in the book series.  With his prosthetic leg, disfigured nose, and roaming magical left eye, Mad Eye Moody is definitely a character I would love to encounter at the Wizarding World of Harry Potter theme park.