I think in my own head I categorize both the Zelda games and GTA as "adventure games", while Oblivion and Skyrim fit as "RPG" despite the basic playstyle being

I think in my own head I categorize both the Zelda games and GTA as "adventure games", while Oblivion and Skyrim fit as "RPG" despite the basic playstyle being similar to the GTA series. I think it's something about the extensive character customization/progression making the division for me.