I used to think I'd quite like to be a publisher, but I've changed my mind since. I think it helps if you like books (because chances are you'll be reading quite a few) and also can be pretty ruthless, because a lot of rubbish gets sent to publishing houses and has to be tactfully but firmly rejected. I guess what skills and qualities you need depend on the particular post you're applying for, same as any job.
Penelope, in my opinion, would make a great copy editor. She's got the eye for little details and would happily spend all day proof reading.