Kakashi is coolest because of every reason already said and for the fact that he is a closet pervert too! Giggling like a girl with that come come paradise book.
I found that scene one of the funniest in the whole series.
Kakashi OWNS. A FACT and not open for debate!

And Jiraya is cool too because he is so "open minded"
And i especially like the way he moves his finger and says that he is super pervert, or whatever.