9. Bob Saget
Comedian Bob Saget was always the first choice to play Danny, but when it came time to film the Full House pilot Saget had commitments elsewhere. John Posey was consequently drafted in for the unaired pilot, but luckily Saget was available to shoot the show itself.
Saget kept busy after Full House ended. He did sitcom work, comedy specials, and even played a satirical version of himself in Entourage. But he never left Full House behind, and he made several appearances as Danny in Fuller House.
8. Dave Coulier
Dave Coulier actually knew Bob Saget before Full House started – he used to crash at his when he was still a struggling comedian in L.A. And Saget joined Full House a year after his buddy Coulier had been cast as Uncle Joey.