Nigel Mansell deserves to be on the Cult list.... He created his own 'Cult' following with his style and his accomplishments on-track.
After F1, his 3rd place finish in his Rookie drive at the Speedway was legendary. He was the epitome of Guts & Grit!! I was lucky enough to see Mansell win his first Oval race in Milwaukee '93. There was never a doubt in his two years in CART that he was a force to be reckoned with. A driver I will always respect.
And dumb as a bag of hammers into the bargain.