Wrestling’s main arch enemy


Hey Scott,

In comic books and movies, the hero always had their main villain/arch-enemy (batman and joker, superman and lex luthor, spiderman and green goblin). So who would be the following wrestler's main arch-enemy? Example: Sting's would be Flair and Austin's would be Vince McMahon
Hulk Hogan?
Bobby Heenan
John Cena?
Orton?  Maybe HHH?
The Rock?
Gotta go with Austin. 
HBK?
HHH.  
Undertaker?
Kane.  
CM Punk?
His big mouth. 
Bret Hart?
Montreal.