While their are many friendships I find that some heroes are just better off hating each other like rivals. My favorite was Captain America and Wolverine two character that are complete opposites from one another Wolverine hating him for being self righteous and high standard morals and Cap hating Wolverine for being an anti hero, merciless thug. These two were great hating each but now it's ruined because someone at Marvel thought Wolverine needed to watered down to be able to be friends with everyone. Here are the heroes I find are better off hating each other:
Emma Frost and Susan Storm
Namor and Black Panther
Batman and anyone with the name Green in them
Barry Allen and Green Arrow
Ms. Marvel and Rogue
Avengers and X-men
Which heroes do you find are better off hating each other?