I have a colleague at the newspaper I work for who is absolutely how I'd imagine Clark Kent to be (glasses and all).
He can be a bit airheaded/doofy - just enough that he comes across completely harmless/clueless and you often find yourself using the phrase -'oh what are you like?'
He acts a bit naïve, goes out of his way to help people and his good nature is sometimes taken advantage of.
But he's got a lot of pride in his work and he is incredibly confident in his ability to do it - as is everyone else.
Both in and out of work, he's a good humoured, popular person and very involved in the community - the kind of guy who goes over to visit his next door neighbour ever now and then just because she's old and lonely.
He's not a saint or old fashioned. He goes drinking with the boys and he doesn't say 'golly' all the time.
Just a real life nice guy.
Hmmm... Now that I think of it, I really do like the guy