Stev Peat
He's basically the God of Mounatin Biking, currently ranked number 2 or 3 (i forget) in the world. He took his first championship in 1993, been World cup champion 3 times, won the Lisboa downhill, the Mega Avalanche, the British Championship 7 times and the British NPS 7 times too. He's won titles in Cross country, downhill and 4-cross, making him one of the best all round riders to have ever lived.
On top of that he's done it all despite one of his best friends (Jason McCroy) being killed just as the two of them made it big. He's also responsile for getting most of the current Pro-downhillers in the uk sponsorship, training and advice, as well as leading the Orange MTB team to a whole bunch of championships. He's also a really, really nice bloke.
All in all a good person for a role model.