I don't know how you define "friendship" or "best friends".
Same characters going together? Having the same interestes makes you friends?
For me, my best friends are my sky to which I can fly to whenever I want. Each of them have too different characters and almost no same interests. I think the only person which connects them is the little, big me.
I'm proud of them and I adore them so much that my dream is that we can continue like that forever. Many pessismists say that friends can not survive like that. But hey! We did since ~9 years now! And I wish to never have an end for this beautiful friendship...