am181d
Adventurer
I consider Mutants and Masterminds 2e to be pretty rules-light, with very robust customization. While it is not, strictly speaking, a fantasy rpg, it can be used for such pretty easily, even without the fantasy flavored genre book.
Well, Green Ronin also makes True20, which I believe borrows quite a bit from M&M but is explicitly a fantasy RPG. These rules are adapted from their earlier Blue Rose RPG. I haven't played it, but I'm a big fan of the M&M rules, so it's probably worth taking a look at.