It's not an RPG and the interface is limited, but may I introduce you to Galatea? https://ifdb.org/viewgame?id=urxrv27t7qtu52lb https://ifdb.org/viewgame?id=ur

It's not an RPG and the interface is limited, but may I introduce you to Galatea? https://ifdb.org/viewgame?id=urxrv27t7qtu52lb https://ifdb.org/viewgame?id=urxrv27t7qtu52lb (you can play in your browser with the "Play On-line" button.) Make sure to start with "help". She gets annoyed at repetition. She'll react to things you do in the room. Responses differ based on prior conversation and some sort of internal mood implementation. It's a breathtaking amount of work, but it's the very best NPC conversation I've seen.