Dag # 6 Whom am I speaking of?

Riddle!!!!
Hints: (only facts of course)

The Great Wall of China was originally made to keep “...” out. It failed miserably!!

There is no theory of evolution, only a list of animals “...” allowed to live!!

“...” cannot be googled. “...” can only be “...”-led!!

“...” is 71 years old, but will live forever!!

“...” drives an ice cream truck covered in human skulls!!

The leading causes of death in the United States are 1. heart diseases 2. “...” 3. Cancer.

BUT KNOW THIS: The best answer will win, rather than the right one!