Best solo experience would be THW games. You shouldn't think that it's just a question of random events put together in a game. You never know what will happen in the game, what NPCs will do and react.
The offgame are also very similar to RPGs, and very interesting if it's something you're interested into.
These games are also versatile concerning the universes and backgrounds you can play with. Each game have his own setup, own background, but you can easily modify and tweak it to your own needs.