I love the team work Natsu and Gray have. Sure they fight a lot but come on they both know they need each other.
Reason for loving this pair is because I love how they have this rivalry but still have each other's backs it's the perfect friendship and teamwork in my opinion.
Plus they're also my favorite yaoi ship... Shhh don't tell them I said that. XD. But seriously look at them they're adorable!