I'm surprised he didn't mention that a fully mobile Freddy that walked, ran, and jumped around in broad daylight like any other fighter takes away pretty much everything that makes Freddy Freddy. His entire schtick is that he's sneaking up on you when you're not looking - something that's not possible in a game where the camera is always positioned in such a way that all participants are fully visible.
The one cool gimmick he could have is perhaps instead of an idle animation, he falls limp to the ground. You could maybe factor in line of sight to his other attacks too, since we currently have very few characters who exploit that (Mewtwo's Disable and Robin's Nosferatu). Even then though, you're still missing the most basic point of his character.