In reality the closest would probably be a domestique who's good at time trialing, but no real specialist.
But I'd like to be a really, really strong small climber, so I wouldn't have to be afraid of big mountains but would await them eagerly... I would also be a decent but not too great time trialer, so that people always want me to do well and cheer for me!
In theory I would love to be an aggressive one-day-racer, also playing smart tactics, but in real life I would be scared as hell to fail, so even if I had the legs, that wouldn't work out...
A very reliable domestique who attacks and tries to go for as long as possible although the chance for success is very small would also be cool.