Me and my hubby couldn't be any more different , yet we rarely argue, my first one was the younges of a brood like me and it was a case of suvival of the fittest !
I think this applies in friendships aswell not just relationships - not one of my friends are alike - they all have different qualities.
Me and Mr. Den are nothing alike - he is very laid back, not very chatty (unless its about football) - is very patient and is very reliable. I am very sociable, love having a laugh, love talking to people - hate football.