I really like Searchers of the Unknown, the super-minimal D&D by Nicolas Dessaux, where you just use the standard monster statline to represent any character. It's a one-page ruleset. So I converted it into a pocketmod.
Searcher of the Unknown pocketmod PDF for printing
I edited it a little bit to make it fit better. Then to PAD IT OUT, I added Monsters of the Unknown by Brent P. Newhall and a quick equipment list by me.
(Turns out, there is another pocketmod version out there, but I prefer my formatting)
Fight on!