It's interensting what kind of definitions people use for RPGs.
1. Open world to explore; in that category we can put many games including Zelda, GTA, Morrowind, Metroid Prime, Fallout, Final Fantasy etc.
2. Story driven; well then we can include most from the first category again
3. Character driven; same here I suppose
4. Turn based/menu interface combat; if you use this definition thn you have to exclude all games in the first category except Fallout and Final Fantasy.
5. Free choice of character development. In this category I think that Fallout together with Morrowind are the only games that fit (from my examples)
It's kind of a vauge/indefinite category of games.