dont even need to think about it - bioshock series and fallout new vegas / 3 (no mention of 4 because you want older ones )
ps: i know some people dont see them as "rpgs" but yes, if you follow the definition theyre atleast considered partly rpgs, and i would even go as far to call the full rpgs, because thats what you do, you play the role of a person, and you do rpg stuff like leveling up and selecting perks.