Hmm...
Unusual, possibly magical powers, on top of a general ability to pick up useful skills and see what needs doing...the kind of versatility that makes you the right solution for a whole range of problems, at least potentially...some support abilities...
That sounds like a Factotum. It's a somewhat obscure class from Dungeonscape, and I'm having trouble finding a good summary online, but basically it's a focused skill user with the ability to mimic a lot of other class abilities. They're mostly Intelligence-based, and they get a lot of abilities that let them "improvise" in various ways, picking up competency in skills or combat maneuvers on the fly if they have some basic training. Eventually they get the ability to cast a small number of spells, but rather than using them like a normal caster they end up working a lot more like innate abilities that can get swapped out every day.