Seeing the way life is for me... I'd probably first go "Squee! I'm working for Nintendo!" If I were actually lucky enough to work in-house (Nintendo of America would be more likely, since if I worked in Japan, I'd be "I dont' speak Japanese, all the Japanese I know is from anime and that's not good..." ) I'd probably be a peon graphic designer. Still, that would be awesome - I'd love to design packaging, layup for game cases, advertisments, whatever. Graphic design is what I'm trained for and I've done that kind of work for newspapers - it'd be awesome to do it for a big, international company.
Of course, if I were to dream bigger --- Character design, enemy/creature specialty. I am good at designing weird animals/creatures. New stuff for Zelda, Mario.... new Pokemon - (when I was into Pokemon, I designed a few fan-'mon of my own), stuff like that.
Then, the ultimate dream would be my getting to do a game scenario and getting to create TWO of my long game-style fanfics as games. These would be "The Great Desert" and "The Rise of Evil." I'd have to have permission to screw with the Zelda Timeline, though, or explicitly state that these games take place in a slightly alternate universe.
Even being a peon graphic designer would be fun. My guy once applied to an opening he found on a job site for the Pokemon franchise - but it was hard to navigate in Japanese and Engrish and he didn't get the job, but hey, it was THERE.
Edit: After reading over Arky's post...
That would be the truth - any company has paperwork and bureacracy and general boring stuff. I was sort of getting at that with graphic design - it's just sitting at the computer working with various programs and laying up art and photogrphy provided for you. (I've worked for a couple of newspapers and those made me sick of pouring through pages and files of clip art because, lo and behold, I wasn't *allowed* to just draw or design my own graphics for clients because of legal issues - "We'd have to charge them for custom work." I'd waste hours looking for something specific when I could have spent five minutes drawing the damn thing). Still, I *LOVED* doing graphic design in a professional capacity when I was doing it, even with the boring bits. Too bad my bosses were jerks.
Oh, and I read something once about Videgomae Testers. It's not as fun a job as it sounds. Most of them find a glitch then have to keep replaying the same area/scene over and over again to report every minute detail of the glitch. - Sounded like something that would make videogames not-fun, which is sadness.