This is kind the reason why I enjoy Elder Scrolls games a lot. In my case, overtime I think I turned my Oblivion and later Skyrim in my own jrpg (in fact I did once find a amazing mod, which added a High School…I am not kidding, it even have a Persona style velvet room…), it all start back in Oblivion, when I found some forum where people make thread showing their characters and telling some stories about them (kind like a AAR),
In my case, I soon start to download jrpg themed mod here and there, while I also created my own companions in both games (in effect, giving my main character a party) and also download lots of “pose” mods (mods which allow you to pose your main character or npcs), imagining their backstories and even creating scenes, in fact most of my gameplay is divided between exploring the world to collect resource to forge new armor and clothes for new scenes, and later making those scenes. In fact I think my mod list mostly clothes, armor, hairs, poses and places, very few other stuff for gameplay itself.
I tried the same thing with Fallout, but I never enjoyed this game much as the Elder Scroll games, but I did tried to create a Kenshiro (from Hokuto no Ken) inspired character…