Kingreaper
Adventurer
This sounds like pretty much my experience with 3.5I still remember with great fondness, as do my players, a 3.wombat game based entirely around one sentence of my adventure outline.
I've never statted up an enemy fully. I've rarely even decided what enemies they're going to face ahead of time.
In my first ever session (I'd never even played 3.5 before, d20 modern, but not 3.5) they were meant to rescue a prostitute from a group of demon-worshipping were-rats. Instead, most of them ended up fighting an army of skeletons in a hospital, before finding out that the "prostitute" was actually a princess, and the local duke had been trying to kill her because she was married to a half-rat. And pregnant.*
*Her unborn baby is currently being transformed into the dead wife of an ex-PC necromancer.
I say most of them were fighting the skeletons, one of them was running around trying to find someone to sell a horse to.