Your mysterious helper and friend. He is hiding from Klogg and doesn't know how to save the Neverhood himself, but he'll do anything he can to show Klaymen the right way.
Willie, third son of Ottoborg, is a longtime friend of Hoborg, he was there when the Neverhood was created and when SOMEthing went wrong. He's the only one who knows about it, since even the all-knowing Wall of Records stopped writing when Klogg took the throne.
Talking of the Wall: In the Hall of Records you can read more about Wil's background, his giant robot-pal Bil, and the fact that he's not altogether sane. And that's what makes him so likeable, no? o8-)