he was born to ...
play Shaggy in Scooby Doo. It's like Shelley Duvall was born to play Olive Oyl. Matthew Lillard was born to play Shaggy. And he did it so well too! Definitely an underrated actor.
share....play a creep!
Qualifications:
1) Immaturity - check
2) Unkept unusual appearance - check
3) One weird voice - check
When you have all of this, can you think of a better way someone people would easily love to hate and get rich doing it? Made for this. I bet he might have the class clown in his high school years. Some people have it. Some lucky, some not. He had it, unfortunately, and used it quite wisely.