If I stayed in the condition I was about 6 years ago, I'd be a kick ass rogue.
Back then I ran a 13 second 100m sprint (decent, not amazing), was very strong for my build, was very agile (parkour style agile) and quite intelligent (as intelligent as a school kid can be anyway).
Since then I've gotten slower (after a busted knee from skateboarding), I'm stronger than I was obviously, but compared to my former build I've gotten weaker, owing to my knee I'm knowhere near as agile as I used to be but can still move around when I'm feeling up to it. On the other hand I'm still in a good weight class for a rogue and since I've been through university (pharmaceutics) I've only gotten smarter and would have a flair for the use of poisons etc. I've also gotten alot taller (a good 8 inches or so), which sort of works against me, as a good rogue should be on the smaller side of average i.e. not short enough to be considered short, not tall enough to be considered average (if using a disguise it makes the most logical sense to be as forgettable as possible, compare a 6'6" person and a 5'8" person, who will you remember?).
All in all, I could have made a decent rogue years ago, but now the prospects aren't quite as good.
I suppose that defaults me to being a mage. How uninspired... I definately don't have the build of a warrior. I'm far too lightly built. As a mage I'd be an enchanter/cleric and form a party with some other heroes imbuing weapons, enchanting armor, healing wounds, illuminating dark places etc. You know. The kind of thing a supportive hero might do.