So many great roles, especially as a heel, and yet he's "The Sound of Music" guy, which is amusing to me. His feelings about the movie mellowed over time, but for years he ranted about the sappy sweetness of the role that had no depth, the overdubbing of his singing voice and having to work with "Miss Disney," Julie Andrews.
Much like Leonard Nimoy or Judy Garland or John Lennon, I think performers look at each role or song as a moment in time, and move on to the next project. But as the audience, we pigeon-hole them into these iconic characters or one-hit wonders, and don't understand why they don't feel the same way about their stardom. And yet, to be remembered forever as Spock, Dorothy, a Beatle or Capt. von Trapp is sort of why they got into the thing in the first place.
But I can understand why the demons haunt people like Dustin Diamond, who couldn't get people to separate him from the character. And yeah, I can see where playing "Lullaby" for the 10,000th time might get tiresome to Shawn Mullins, even if the residuals pay for the nice house and car in the driveway.